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d&b audiotechnik A1 Mainframe F-Series User manual
A1 Mainframe
F-Series, M2, M1220
User Manual
References in the manual
WARNING!
This refers to a potentially
dangerous situation which may
lead to personal injury.
CAUTION!
This refers to a potentially
dangerous situation which may
lead
to
damage
to
the
equipment.
IMPORTANT!
This refers to a situation which
may cause the equipment to
malfunction.
Symbols on the equipment
Please refer to the information in
the operating manual.
WARNING! Dangerous voltage!
A1 Mainframe, F-series, M2, M1220 User Manual
Version 4.0 E, 02/2001, D2100.E.04
© d&b audiotechnik 1995-2001; all rights reserved.
The information presented in this document is, to the best of our
knowledge, correct. We will however not be held responsible for
the consequences of any errors or omissions.
Technical specifications, weights and dimensions should always be
confirmed with d&b audiotechnik AG prior to inclusion in any additional documentation.
d&b audiotechnik AG
Eugen-Adolff-Strasse 134, D-71522 Backnang
Telephone +49-7191-9669-0, Fax +49-7191-95 00 00
Safety precautions
Before you use our products, read the manual
carefully and observe all the safety precautions.
They will protect you and help to avoid equipment
failures. Keep this manual in a safe place so that it is
available for future reference.
If you supply d&b products, please draw the
attention of your customers to these safety
guidelines. Enclose the relevant manuals with the
systems. If you require additional manuals for this
purpose, you can order them from d&b (order form
on the last page).
Information regarding use of the A1 mainframe
The mainframe complies with the electromagnetic compatibility
requirements of EN 50082-1 - residential, business and commercial
areas.
CAUTION!
Acoustic interference and malfunctions may occur if the unit is
operated in the immediate vicinity of high-frequency transmitters
(e.g. wireless microphones, mobile phones, etc.). Damage to the
mainframe is unlikely, but cannot be excluded.
To meet the EMC requirements, use only shielded cables with
properly connected plugs for all signal terminals (INPUT, INPUT
LINK, MONO OUT).
The following information is intended to prevent fires and possible
electric shocks:
WARNING!
The mainframe is a protective class 1 unit. Make sure that the earth
(ground) contact is attached when the unit is in operation. A missing
earth (ground) contact may lead to dangerous voltages in the
housing and controls.
To reduce the possibility of audible hum the mainframe signal
ground (XLR pin 1) to earth (ground) connection has a high
impedance. It will prevent the unit from static charge but any
voltage applied to signal ground will pass through all connectors.
To prevent electric shock, make sure that all devices in the signal
path are grounded properly.
Never connect an amplifier output pin to any other in- or output
connector pin or earth (ground). This might damage the mainframe
or lead to electric shock.
Lay all cables to and from the unit so that they cannot be crushed
by vehicles or other equipment and that no-one can step on them.
Keep dust, moisture, water or other liquids well away from the unit.
Never operate the unit when it is open.
Always disconnect the mains power supply when replacing a
defective fuse. Only use the type of fuse listed in the specifications.
(4.0 E)
Safety precautions
Only carry out work specified in this manual and always disconnect
the mains power supply.
WARNING!
All other work should be performed by trained service staff,
especially in the following cases:
- Mains power cable or plug has been damaged
- Objects or liquids have entered the unit
- The unit is not operating normally
- The unit was dropped or the housing is damaged
Information regarding use of loudspeakers
Never stand in the immediate vicinity of loudspeakers driven at a
high level. Professional loudspeaker systems are capable of causing
a sound pressure level detrimental to human health. Seemingly
non-critical sound levels (from approx. 95 dB SPL) can cause
hearing damage if people are exposed to it over a long period.
In order to prevent accidents when deploying loudspeakers on the
ground or when flown, please take note of the following:
When setting up the loudspeakers or loudspeaker stands, make
sure they are standing on a firm surface. If you place several
systems on top of one another, use straps to secure them against
movement.
Only use accessories which have been tested and approved by
d&b for assembly and mobile deployment. Pay attention to the
correct application and maximum loading capacity of the
accessories as specified in our Rigging Accessories Manual.
Ensure that all additional hardware, fixings and fasteners used for
installation or mobile deployment are of an appropriate size and
load safety factor. Pay attention to the manufacturers instructions
and to the relevant safety guidelines.
Regularly check the loudspeaker housings and accessories for
visible signs of wear and tear, and replace them when necessary.
Regularly check all load bearing bolts in the mounting devices.
Safety precautions
(4.0E)
WARNING!
CAUTION!
Only use loudspeakers in the F-Series and the M2 and M1220
monitors with the A1 mainframe fitted with the correct controller
modules. The contoller monitors cone excursion and voice coil
temperature of the drivers. When loudspeakers are operated
without the correct controller, in addition to losses in tone, there is
a risk of damage to the components. Any defects arising from
operation other than those specified in this manual will be excluded
from any warranty claims.
Loudspeakers produce a static magnetic field even if they are not
connected or are not in use. Therefore make sure when erecting
and transporting loudspeakers that they are nowhere near
equipment and objects which may be impaired or damaged by an
external magnetic field. Generally speaking, a distance of 0.5 m
(1.5 ft) from magnetic data carriers (floppy disks, audio and video
tapes, bank cards, etc.) is sufficient; a distance of more than 1 m
(3 ft) may be necessary with computer and video monitors.
(4.0 E)
Safety precautions
Configuration switches
These switches depend on the
type of loudspeaker. They are
described individually for each system
in the section "Loudspeakers".
CUT
1220-CO
MON
OV HI
L FC
Displays and controls
of mainframe
These elements are described in
the section "A1 mainframe".
A1
PWR
OV LO
TEMP
GR HI
PROT L O
ID
GR L O
MUT E
ISP
0
HI
REM
0
REM
L OCK
ON
OFF
-6
-18
-12
-3
+3
dB
HI dB
Displays and controls of
controller modules
These elements are common to all
modules. They are described in the
section "Controller modules".
FAIL
FUSE T8A
FAIL
220V-240V∼
50-60 Hz
OVER
VOLTAGE
Output connectors
These elements are described
individually for each system
in the section "Loudspeakers".
1220
I NPU T
PUSH
FUSE T2A
Input connectors
These elements are described in
the section "A1 mainframe".
O U T PU T 2
P I N A S S I G N MEN T
REMOTE
CONTROL
A L O W OU T +
B
L O W OU T -
C
S PE A K E R I D
D SPEAKER ID
E
S EN S E D R I V E +
F
S E N SE D R I V E -
G HIGH OUT +
H HIGH OUT -
A1 mainframe front and rear views
O U T PU T 1
I NPU T L I NK
Contents
Safety precautions
1.
1.1.
1.2.
1.3.
Introduction ................................................... 1-1
System concept......................................................................... 1-1
d&b active systems design...................................................... 1-2
Block diagram .......................................................................... 1-2
2.
2.1.
2.1.1.
2.1.2.
2.1.3.
2.1.4.
2.1.5.
2.1.6.
2.1.7.
2.1.8.
2.2.
2.3.
2.4.
2.5.
2.6.
A1 mainframe ............................................... 2-1
Features..................................................................................... 2-1
A1 power amplifiers ................................................................ 2-1
SenseDrive ................................................................................ 2-1
SpeakerID ................................................................................. 2-2
Fan ............................................................................................. 2-2
Mains overvoltage protection................................................ 2-3
Mains inrush current limiter .................................................... 2-3
Fuses .......................................................................................... 2-3
Remote control & monitoring ................................................ 2-3
A1 controls & indicators.......................................................... 2-5
Connections .............................................................................. 2-6
Mainframe installation ............................................................ 2-7
Power consumption and power loss ...................................... 2-8
Technical specifications ........................................................... 2-9
3.
3.1.
3.2.
3.3.
Controller modules ........................................ 3-1
Features..................................................................................... 3-1
Controls & indicators ............................................................... 3-2
Module exchange and replacement...................................... 3-3
4.
4.1.
4.2.
Loudspeaker systems .................................... 4-1
Connections .............................................................................. 4-2
Data sheets for the loudspeakers .......................................... 4-3
F1220
F1222
M1220
M2
F2
B1-SUB
B2-SUB
5.
5.1.
5.1.1.
5.1.2.
5.1.3.
5.2.
5.3.
System operation .......................................... 5-1
Setting up/stacking the loudspeakers ................................... 5-1
Vertical coverage .................................................................... 5-1
Arraying mid/high cabinets ................................................... 5-1
Stacking subwoofers................................................................ 5-2
Wiring ....................................................................................... 5-3
Level setting for mixed systems.............................................. 5-4
6.
Troubleshooting ............................................ 6-1
7.
Publications list.............................................. 7-1
8.
EU declaration of conformity (CE symbol) ..... 8-1
(4.0 E)
Contents
1. Introduction
This user manual describes the facilities, functions and operation of
d&b active controller loudspeaker systems and covers the operation of the A1 mainframe, controller modules and loudspeakers used
in these systems.
d&b publishes additional application and technical information notes (TI). A d&b publications list and order form is appended to this
manual and we will gladly send you any of the listed publications
on request.
This user manual should provide the information you need in order
to get the best performance out of the system. If you have any
comments on the information presented, or feel that something is
inadequately explained or not covered, then please tell us using
the comments section of the publication order form.
1.1.
System concept
All d&b loudspeaker systems are designed to meet the following
criteria :
- Consistent neutral sound over the full working dynamic range
- Ease of operation
- Simple set up and wiring
- Safe and reliable operation
- Compact design
In order to satisfy these demands d&b developed a complete
system concept incorporating the loudspeaker, the loudspeaker
specific control electronics (the controller) and the power amplifier.
Fundamental to the performance of the loudspeaker is the care
taken in the development of individual components resulting in well
controlled dispersion, high efficiency and excellent dynamic
response.
The controller creates the optimum mix of output level capability,
operating reliability and longevity, and pure sound quality.
Protective circuits continuously model the loudspeaker load through
simulation of cone displacement and voice coil temperature
ensuring signal level is only reduced when necessary to prevent
driver damage. No signal compression takes place within the
systems normal operating range and there is no dynamic
manipulation of system frequency response enabling most
applications and acoustic environments to require no additional
signal processing.
The power amplifier and control for each loudspeaker are housed
within the A1 and P1200A mainframes or the E-PAC power
amplifier controller. All systems are compatible, easily combined
and complementary, and can be accessed using the d&b remote
control system to allow overview and control over the most
complex applications.
(4.0 E)
1-1
1.2.
d&b active systems design
Their are two types of d&b active loudspeaker system - active subwoofers and full range, 2 way, active loudspeakers. Each type of
active system is driven by an A1 mainframe fitted with a single,
loudspeaker specific controller module.
The different loudspeaker controller modules house the signal processing electronics, connectors, controls & indicators appropriate to
the different types of loudspeaker.
As well as the controller module, the A1 mainframe houses two separate power amplifiers - a 1200 W / 4 Ohm low frequency amplifier and a 350 W / 4 Ohm high frequency amplifier. In the case
of the full range 1220 System, a single A1 fitted with a 1220 controller module can drive two 1220 cabinets. With the higher output
full-range F2 System, each F2 cabinet needs to be driven by its
own A1/F2 controller module combination.
The full range systems can of course be supplemented with B1 or
B2 subwoofers. Each active subwoofer cabinet is driven by its own
A1/controller module combination - the mainframe HF amplifier
being unused.
The modular nature of mainframe based systems allows later reconfiguration. Simply changing the type of controller module fitted
to a mainframe alters the mode of mainframe operation without
the need for any internal changes to the mainframe itself.
The A1 mainframe incorporates an interface for remote control
and monitoring of all controller module and mainframe functions.
Active full range systems may also be used with Series 02 subwoofers - e.g. the F2 System and C4-SUBs. Series 02 systems use the
d&b 1200A mainframe.
Block diagram
Highpass
switchable
EQ
Temperature
A1 User Manual
2-way box
with Speaker ID
and SenseDrive
ID
Temperature
VCA
Block diagram - full range active system
1-2
Power Amplifier
Mute
Level
Displacement
Cross Over
Configuration
Input Stage
HF-Protect
VCA
Displacement
EQ
HF Level
1.3.
Power Amplifier
Sense
Drive
2. A1 mainframe
The A1 mainframe is housed in a 3 rack unit high, 353 mm (13.9")
deep, 19" rack mount enclosure. The A1 is designed to accept a single d&b active system controller module and includes power supplies,
separate LF and HF power amplifiers, protection circuits with their indicators and a remote control interface.
All mainframe facilities and functions and those of the controller
modules can be remotely interrogated and altered via the d&b
Remote Interface Bridge (RIB).
2.1.
Features
2.1.1. A1 power amplifiers
The two power amplifiers fitted to the A1 can, respectively, deliver
700 W +200 W continuous sine wave power into an 8 ohm load - increasing to 1200 W + 350 W continuous sine wave power into a
4 ohms load. These output ratings are valid for at least 30 minutes of
operation at an ambient temperature not exceeding 24° C.
Continuous sine wave power rating represents an extreme of operation not normally encountered when reproducing typical speech and
music signals - both complex waveforms with average power levels
usually well below their peak power level. Even when driving a d&b
active system with highly compressed music (2:1 crest factor), the A1
will operate indefinitely - provided of course that the amplifier cooling
system has sufficient cool airflow.
2.1.2. SenseDrive
The accuracy of a loudspeaker’s signal reproduction, both level and
transient response, is influenced by dynamic damping factor - the ratio of the load to source impedance.
Especially at low frequencies, the impedance of a loudspeaker will vary markedly with frequency. This impedance variation will significantly
affect the system response. Whilst amplifier source impedance remains
constant the impedance of the cables and connectors will largely depend upon the length and type of cable used - longer cables produce
greater signal losses.
d&b SenseDrive compensates for the electrical properties of the loudspeaker cable. Two “sense” wires connect the signal from the LF driver
back to the amplifier where it is compared and corrected to compensate for the cable losses. Signal reproduction is enhanced by delivering the correct signal to the loudspeaker terminals irrespective of the
cable losses.
The SenseDrive technique is not used for driving the loudspeaker HF
driver since external interference from souces such as adjacent lighting wiring could interfere with the operation of the Sense-Drive circuits. The relatively high impedance of HF drivers also tends to swamp
any increase in load impedance due to longer speaker cables.
The A1 SenseDrive circuit is gain limited and whilst this imposes a ceiling on damping factor improvement, it guarantees stable operation
with no cable length restriction using speaker multicores such as d&b
MC8.
(4.0 E)
2-1
2.1.3. SpeakerID
A built-in SpeakerID circuit ensures that signal can only be connected to a loudspeaker if it matches the controller module fitted to
the mainframe. When the SpeakerID circuit senses that the correct
loudspeaker is connected to the mainframe output then the internal
power amplifier outputs are fed to the mainframe speaker output
connector(s) and the green ID LED on the controller module front
panel illuminates.
With no cabinet connected, the ID LED remains unlit. If the wrong
type of cabinet is connected the ID LED will flash and the power
amplifier outputs are internally isolated from the mainframe speaker output connector(s).
SpeakerID not only prevents loudspeaker damage it also prevents
hazardous voltages appearing on the exposed pins of the speaker
output connector(s).
Where a mainframe, such as the 1220 System, has two speaker
output connectors these are independently monitored and separately switched. However, to alert the user, connecting just one
wrong cabinet will mute both output connectors.
2.1.4. Fan
A fan draws in air through a filter behind the rear panel air intake.
The fan speed is governed by the temperature of the output
module heat sink and the momentary output level. This
arrangement ensures a minimum of fan noise since the fan
operates at minimum speed when power demand is low.
The level controlled fan allows greater cooling during louder
passages, thereby allowing fan speed to be reduced still further
during quiet passages preventing background noise interference.
We advise frequent cleaning of the fan filter to ensure good
airflow through the unit. If the filter is visibly dirty, then it should be
cleaned or replaced. Never operate the A1 without a filter. Dust
deposits, especially combined with damp conditions, could cause
the mainframe to malfunction.
When setting up the mainframe, do not block or cover the rear
panel air intake or the vents on the front panel of the mainframe.
See also section 2.4. (Mainframe installation).
2-2
A1 User Manual
IMPORTANT!
FUSE T2A
FAIL
FUSE T8A
FAIL
220V-240V
50-60 Hz
∼
2.1.5. Mains overvoltage protection
To protect against mains overvoltage damage the A1 is fitted with
an efficient, self-resetting mains overvoltage protection circuit.
OVER
REMOTE
VOLTAGE
CONTROL
A1 mains input and fuses
As soon as the mains supply voltage exceeds 265 V (115 V for the
100 V supply version) the overvoltage protection circuit responds
and isolates the mainframe power supply from the mains supply
leaving only a supervisory circuit active to monitor the mains supply voltage. The green POWER LED on the mainframe front panel
goes out and the OVER VOLTAGE LED on the mainframe rear panel comes on.
Only if the mains voltage drops below 255 V (111 V) is the mainframe automatically reconnected to the mains supply and normal
operation resumed. This 10 V difference in the protection circuit
switching levels (switching hysteresis) prevents the mainframe from
cycling on and off with a fluctuating mains supply voltage.
The protection circuit will operate with any mains overvoltage up
to 400 V; allowing the A1 to survive connection across two phases
of a three phase supply.
2.1.6. Mains inrush current limiter
The mains inrush current limiter ensures a slow "start-up" for the
mainframe and allows several mainframes connected to the same
mains supply circuit to be switched on together without temporarily
overloading the supply circuit and causing a breaker to trip. The
inrush current at switch on is limited to 5 A (230 V version).
Note that repeatedly and rapidly switching a mainframe on and
off will overheat and stress the inrush current limiter circuit - a rear
panel fuse protects the circuit from damage.
2.1.7. Fuses
Two 20 mm delay fuses are fitted on the mainframe rear panel an 8 A fuse for the mainframe power supply and a 2 A fuse protecting the mains inrush current limiter. If either fuse should blow
then the red LED (FAIL) indicator next to the respective fuseholder
will light.
2.1.8. Remote control & monitoring
The A1 is fitted with a twin wire remote interface for various levels
of remote control and system supervision of the mainframe and its
controller module. The remote interface connection is opto-isolated
and floating.
Basic Remote
The Basic Remote is the simplest way to implement a remote control
system. A mainframe can be remotely powered on by simply applying an 18 - 28 VDC control voltage to the terminals of its remote interface connector. Connecting a simple detector circuit to
the remote interface of a mainframe also allows remote warning of
a mainframe fault. Details of basic circuits for remote power control and fault display are published in d&b technical information
bulletin TI 212.
(4.0 E)
2-3
Remote operation using the d&b Remote Interface
Bridge (RIB)
The d&b RIB is housed in a 1 RU high, 19“ rack mount enclosure.
Combinations of 1 to 12 mainframes (A1 or P1200A) up to 500 m
away can be directly connected to a RIB I/O port by a twin wire
bi-directional serial link.
From the front panel of the RIB each mainframe can then be remotely powered on and off and its power and error status monitored.
A group of mainframes can be switched directly by the RIB front
panel MASTER ON/OFF switch or remotely via a connection to an
opto-isolated input port on the rear panel of the RIB. Remote indication of the error status of a mainframe group can also be relayed by the RIB.
Computer/MIDI control
The RIB can be controlled by a computer (RS232, RS422 or MIDI interface) running suitable control software or by a MIDI control device. Under computer control, the following remote control and display options become available:
Remote control
− Power On/Off switching of mainframe
− Level control from +0 to -63.5 dB in 0.5 dB steps.
− MUTE switching
− Configuration switching e.g. CUT, MON, etc.
Remote status information
− Configuration switch status
− Mute switch status
− Level control setting
− Front panel indicator status (ISP, GR, OVL etc.)
− SPEAKER ID status
− Protect status (DC protect, short circuit protect, thermal protect)
− Heatsink temperature in °C
− Available headroom (pre-limiter)
− Gain reduction (due to limiter operation)
2-4
A1 User Manual
PWR
2.2.
TEMP
PWR - Power (green)
− On. when the mainframe is connected to the mains supply, switched on and ready for use.
PROT LO
HI
REM
REM
LOCK
ON
OFF
A1 front panel
A1 controls & indicators
− Off. The mainframe is not connected to or powered from the
mains supply. The mains overvoltage protection has triggered
(see above) or the mainframe is not switched on.
− Flashes during the initial power-up cycle for about 2 seconds
and also when the mains overvoltage protection circuit is triggered by an external fault (see also PROT below).
TEMP - Temperature (red)
− Flashes. The mainframe has switched off because the maximum
permissable operating temperature has been exceeded. This occurs if the power amplifier heatsink temperature exceeds 83° C or
if the mains power transformer temperature exceeds 120° C.
PROT - Protect (red)
As the two mainframe power amplifier channels operate independently there are separate PROT indicators for LO and HI channel.
− On. An internal fault has been detected on the mainframe chan-
nel concerned and that channel has been disconnected (e.g. DC
voltage fault in the output stage).
− On and the PWR LED also flashes. An external fault has
switched off the affected power amplifier channel. Typical faults
producing this indication are shorted speaker cables or a load
impedance which is too low for the amplifier to drive. Once the
cause of the fault has been identified and removed, either muting
and un-muting the controller module, or powering the mainframe
off and on again, will reset the mainframe fault protection circuits
and allow normal operation to resume.
REM - Remote (green)
− On. The mainframe is connected to the d&b RIB and ready for
communication.
LOCK (yellow)
− On. The mainframe has been placed in a locked condition by a
remote control system. This means that all the mainframe and
controller module controls with the exception of the mains switch
are inactive (locked out).
− Off. The A1 mainframe is set to local operation, i.e. may be ope-
rated using the front panel controls.
OFF/REM/ON (power switch)
− OFF. With the exception of the mains overvoltage protection circuit, the mainframe is isolated from the mains supply.
− REM. The mainframe is set to remote operation. If no remote
control system is connected this setting is equivalent to the power
switch OFF position.
− ON. The mainframe is switched on. In this switch position, the re-
mote control system can monitor and display the operational status of the mainframe but cannot change any settings.
(4.0 E)
2-5
2.3.
Connections
INPUT and INPUT LINK
The mainframe has a 3 pin XLR female input connector. Beneath
and wired in parallel is a 3 pin male XLR connector to provide an
input link - sometimes called a ‘pass-through’ connector - used to
feed the input of the next device in the system signal chain.
INPUT
INPUT LINK
Transformer balanced input (option)
To prevent system ground loops, the P1200A can be supplied with
transformer balanced inputs. The transformers used are studio
quality torroidal transformers able to handle signal levels up to
+28 dBu without degrading the systems low frequency response.
The input balancing transformer gives electrical isolation between
the source output (e.g. mixing console) and controller inputs and
therefore prevents ground loops. A 22 kohms coupling resistor
prevents electrostatic loading of the mainframe.
REMOTE CONTROL
The A1 is fitted with a two-wire serial remote control interface. The
3 pin female DIN remote control connector is located on the left of
the A1 rear panel. The connector is opto-coupled.
A1 input signal connectors
The remote functions are detailed in section 2.6. (Remote control &
monitoring).
OUTPUT (loudspeaker outputs)
The speaker output(s) are also located on the mainframe rear panel. Both power amplifier outputs (LF & HF), SENSE DRIVE and
SPEAKER ID connections all terminate on a single 8-pin CA-COM
connector. The CA-COM is a particularly robust and reliable bayonet fit (locking) connector.
Pin 2 (pos. signal)
Pin 1 (GND)
Pin 3 (neg. signal)
Pin assignments on P1200A signal inputs
Different controller modules have different output connector pin
assignments which are printed on the panel next to the connector(s). Each controller module speaker output panel is described in
the later sections of this manual along with the different active
loudspeakers and their controller modules.
Pin 3 (+)
Pin 1 (–)
Pin assignment for remote
control
F2
PIN ASSIGNMENT
OUTPUT
A LOW OUT +
B
LOW OUT -
C
SPEAKER ID
D SPEAKER ID
E
SENSE DRIVE +
F
SENSE DRIVE -
G HIGH OUT +
H HIGH OUT -
F2-CO loudspeaker output
2-6
A1 User Manual
2.4.
Mainframe installation
P1200A mainframe enclosures are designed to fit a standard 19"
equipment rack or cabinet.
The front panel vent slot serves as a useful handle for lifting and
moving mainframes in and out of racks. The front panel switches
are flush-fitted and the level control(s) and mainframe power
switch are recessed to protect them from accidental damage and
unintentional adjustment.
When specifying a rack, be sure to allow extra depth (10 cm is
usually sufficient) to accommodate the cables and connectors at the
rear of the mainframe(s).
When mounting mainframes into a 19" rack cabinet, provide
additional support using shelves fixed to the inner sides of the
cabinet or the mounting holes provided on the mainframe rearmounted rack ears - do not just rely on fixing and supporting
mainframes by their front panels. This advice is particularly
important if mainframes are being racked-up for touring use.
Since the P1200A power amplifiers can generate a lot of heat,
please ensure, whatever the mounting or racking arrangement,
that adequate cool airflow is provided to avoid a build-up of hot
air inside the rack leading to overheating. The P1200A air intake is
on the rear panel and the air outlets are set into the front panel.
132
To maintain good airflow through mainframes we recommend
frequent cleaning of the fan filters. If mainframes are installed in
cabinets so that direct access to the rear panel filters is not
possible, we recommend using additional fan modules with frontmounted filters which can be easily replaced without opening the
sealed cabinets. We will gladly advise on the choice of suitable fan
modules.
483
443
5
323
348
338
A1 enclosure dimensions
(4.0 E)
2-7
2.5.
Power consumption and power loss
The power required from the mains supply and the waste heat
produced by the amplifiers power loss are variable figures
depending on the load impedance and the signal levels and
characteristics (e.g. speech, music).
In practice, the theoretical peak power consumption of a system
will only be sustained for a short period of time. Basing mains
current and air conditioning plant requirements on the peak power
consumption of the sound system would result in a generously
over-specified installation. The key factor in power consumption
calculations is the crest factor of the music signal or speech signal the ratio of peak to sustainable RMS voltage of the signal.
The table on the right gives power figures for various types of
signal waveforms. The figures were measured on a A1 mainframe
driving a 4 and 8 ohms load (LO and HI channel) to the clipping
point of both mainframe power amplifiers.
Power input and thermal power loss as a function of average
output power for sine wave and pink noise signal waveforms can
also be derived from the two graphs shown below (Note that pink
noise signal reaches the clipping point of the amplifiers at approx.
200 W average output power).
Signal
waveform
CF
Pout
[W]
Pin
[W]
Ploss
[W]
Square wave
1
2150
2900
750
Sine wave
1,4
1400
2130
730
Pink noise, com- 3,5
pressed music
200
500
300
Music with medium dynamic
range
100
300
200
40
200
160
5
Speech, music
8
with wide dynamic range
CF
Pout
: Crest factor
: Maximum average outputpower (sum of both channels)
: Power input
: Power loss
Pin
Ploss
2000
power [W]
power [W]
A1 Power balance
1000
2000
1000
consumption
consumption
loss
loss
100
100
50
1
10
100
1000
2000
average output power [W]
Average power consumption and loss of A1 as a factor of
output power with pink noise signal
(load impedance 4 / 8 ohms, both channels driven, sum of
output power of both channels)
2-8
50
1
10
100
1000
2000
average output power [W]
Average power consumption and loss of A1 as a factor of
output power with sine wave signal
(load impedance 4 / 8 ohms, both channels driven, sum of
output power of both channels)
A1 User Manual
2.6.
Technical specifications
Nominal output power............................................... 700 / 200 watts - 8 ohms
(THD+N < 0.1%, both channels driven)..........................1200 / 350 watts - 4 ohms
Frequency response (–1 dB) ............................................................. 20 Hz - 50 Hz
measured at rated output power, both channels driven
Harmonic distortion (THD+N)................................................ < 0.05 % / 0.03 %
from 0.1 W to rated output power, 20 Hz - 20 kHz
Intermodulation distortion (SMPTE).................................. < 0.06 % / 0.02 %
from 0.1 W to rated output power
Residual noise............................................................................... > 112 dB / 114 dB
below rated output power, 22 Hz - 22 kHz, unweighted, RMS
Damping factor at loudspeaker output ................................................ > 50 / 100
20 Hz - 20 kHz, 4 ohms load
Crosstalk ............................................................................................................. < –55 dBr
Protection circuits
Mains inrush current limiter ............................................................................................ 5 A
Switch-on delay .............................................................................................................. < 2 s
Overvoltage, DC output, overtemperature and short circuits
INPUT.........................................................................................................XLR 3-pin female
Input impedance......................................................................................................44 kohms
electronically or transformer balanced (optional)
INPUT LINK................................................................................................XLR 3-pin male
parallel to input
C4-OUT (B2-CO only)..............................................................................XLR 3-pin. male
balanced, output load impedance .................................................................≥ 600 ohms
OUTPUT ...........................................................................................8-pin CA-COM, male
Pin assignments depend on type of loudspeaker
General
Height x width x depth ...................... 3 rack unit x 483 mm (19") x 353 mm (13.9")
Weight with module fitted ........................................................................ 22 kg (48.5 lbs)
Mains voltage (min/nominal/max) ........................ 195 /230 /265 V / 50 - 60 Hz
.................. (additionally with 115/230 V version: 98 / 115 / 132 V / 50 - 60 Hz)
............................................................ (100 V version: 85 / 100 / 115 V / 50 - 60 Hz)
Fuses ............................................................1 x 2 A Time Lag (T), 1 x 8 A Time Lag (T)
.......................................................................(115/230 V version: 2 x 8 A Time Lag (T))
.................................... (100 V version: 1 x 5 A Time Lag (T), 1 x 16 A Time Lag (T))
1
THD + Noise (%) vs Output Level (W)
0.1
0.010
Low 4 ohms
Low 8 ohms
High 8 ohms
0.001
0.2
(4.0 E)
1
10
100
1k
2k
2-9
3. Controller modules
The different controller modules include all the signal processing
electronics, front panel controls and indicators needed to control
and operate a specific matching active loudspeaker system. Shown
opposite is the 1220-CO used with the F1220 and M1220 loudspeakers. The actual controller circuitry, controls, indicators and
rear panel connectors will of course vary depending upon the requirements of the loudspeaker design they are intended to drive
3.1.
Features
Input circuit
A balanced and band-limited input circuit protects the system
against out-of-band signals and radio frequency interference.
Equalisation
Equalisers in the controller module match the relative levels of the
high and low drivers used in full range cabinets and ensure the
linear frequency response of the loudspeaker system. Some
controller modules are fitted with additional configuration switches
to give the user a degree of control over the system frequency
response.
Highpass filter
A highpass filter circuit fine tunes the bass-reflex loudspeaker
enclosures used in these systems and also helps to maintain a linear
low frequency response while protecting the loudspeakers from
extreme sub bass signals.
CUT
1220-CO
MON
OV HI
LFC
OV LO
Subwoofer crossover filters
The controller modules for the subwoofer systems incorporate a
lowpass filter as an active crossover to a full range/TOP system.
Conversely, the full range systems have a switchable highpass filter
for use with an additional subwoofer system.
Thermal limiter
An internal control circuit simulates the loudspeaker voice coil temperatures under actual load conditions. The output of this circuit is
used to protect drivers by reducing the signal level when critical
temperature values are reached.
GR HI
ID
GR LO
MUTE
ISP
0
LF displacement limiter
A second internal control circuit simulates the mechanical displacement of the LF driver cone and reduces the signal level before
overexcursion damage can occur.
0
-6
-18
-12
-3
dB
1220 controller front view
+3
HI dB
Clipping limiter
To maintain sound quality output stage clipping is kept within
reasonable bounds by a limiter circuit. The limiter threshold alters
to take account of the supply voltage to the mainframe power
amplifiers. So if the mains supply voltage or the connected load
impedance alter, then the limiter automatically tracks these changes
to maintain the system sound quality.
2-way active crossover
The controller modules for the full range 1220 and F2 systems
employ active crossover circuits to split the controller input signal
into high & low signal paths to separately feed the high & low
(4.0 E)
3-1
drivers in the F1220 and F2 speaker cabinets. Each signal path,
high & low, uses equalisers and limiters specifically adjusted to the
electroaccoustic requirements of the different speaker designs.
HF Level setting
As well as an overall level control, both active system controllers,
1220 and F2, provide a front panel HF level control to fine tune
the balance between the cabinet high and low drivers at different
listening distances. The 1220 HF level control has a +/- 3dB range
while the F2 HF level control has a 0dB to - 6dB range.
3.2.
Controls & indicators
F2-CO
CUT
OV HI
OV LO
GR HI
ID
GR LO
MUTE
ISP
This section describes the controls & indicators common to all
A1controller modules. Loudspeaker specific controls and indicators
„
are explained in section 4 of this manual Loudspeaker systems“.
OV HI/LO - Overload (red)
− On. Illuminates when an overload occurs in the signal path
(input signal too high)
− On. Illuminates when the controller limiters reduce gain by
more than 12 dB (input signal too high).
− On. Illuminates when the amplifier gain is reduced because the
output current is too high (e.g. perhaps due to a cable or
connector short circuit).
GR HI/LO - Gain Reduction (yellow)
− On. Illuminates when the controller limiters for the channel
indicated reduce gain by more than 3 dB.
ID - SPEAKER ID (green)
− Off. No speaker is connected to the output. Internally, the
mainframe power amplifier outputs are isolated from the pins
of the rear panel speaker output connector(s).
− On. One, or in the case of the 1220 system, two loudspeakers
of the correct type are connected to the mainframe speaker
output(s). The system is ready to operate.
− Flashes. Either one or two loudspeakers of the wrong type
have been connected to the mainframe speaker output(s). The
speaker outputs are disabled - internally isolated from the
mainframe power amplifier outputs.
ISP - Input Signal Present (green)
− ON. Illuminates when the signal presented to the controller
input exceeds a -36 dBu threshold value. The ISP circuit is
unaffected by the setting of the controller mute switch and level
control.
3-2
A1 User Manual
0
0
-6
-2
-18
-12
dB
Standard controls,
F2 controller module
-6
-4
HI dB
MUTE (red)
This switch mutes the system output without having to alter any of
the system level settings. The mute circuit acts by electronically
disconnecting the mainframe power amplifier output. The red LED
next to the MUTE switch illuminates to verify that the switch has
been selected.
If cabinets used in an array are muted, the movement of the
loudspeaker cones in those cabinets is no longer damped by the
influence of the mainframe power amplifier output. The removal of
damping to some drivers in an array makes them susceptible to
excitation by the other loudspeakers in the array. Audible
resonances may occur, and even absorption of low frequency
sound energy as the undamped loudspeakers act like a ‘bass trap’.
To permanently mute single cabinets of an array it is therefore
preferable to turn down or disconnect the input signal of the
corresponding controllers instead of using the MUTE switch.
When the mainframe is connected to the d&b remote control
system (d&b RIB and PC) it is possible to use the minimum input
gain setting (–57.5 dB) instead of the MUTE function.
Level control
The detented level control adjusts the controller input sensitivity
and has a 20 dB range, calibrated in 1 dB steps. The level control
is normally set to 0 dB. On 1220 and F2 controllers, to the right of
the level control is an HF level control which sets the relative level
of the HF signal from about 1 kHz upwards.
(4.0E)
3-3
4. Loudspeakers
d&b active systems consist of full range speaker cabinets fitted with
separate high and low frequency drivers and actively driven by an
A1 mainframe. A full range active system may be supplemented
with additional active subwoofer systems.
All of the full range cabinets feature CD dispersion. CD stands for
‘Constant Directivity’ and indicates that the coverage angle of the
loudspeaker is largely unaffected by frequency. A CD characteristic is essential for loudspeakers intended for use in multi-cabinet
arrays.
A complete range of mounting brackets, flying frames, rigging accessories and a state-of-the-art flying system are available to allow d&b loudspeakers to be arrayed as quickly, safely and effectively as possible. Some of the rigging systems and fittings are loudspeaker-specific so for further details please refer to the brochures
for each system and the d&b Rigging Accessories manual.
Constructed from marine plywood the loudspeaker cabinets have
an impact-resistant paint finish and the drivers are physically protected by a rigid steel front grill covered by acoustically transparent foam.
IMPORTANT!
d&b active system loudspeakers may only be driven by the appropriate controller modules and A1 mainframes. Only by using the
controller can maximum loudspeaker performance be achieved.
Ignoring these basic requirements can adversely influence sound
quality and risk damage to the loudspeakers. Without the correct
thermal and LF displacement limiters in operation LF drivers are
particularly susceptible to damage.
Please note that driving an active series loudspeaker cabinet without a suitable controller will void any warranty claim relating to
loudspeaker failure.
d&b loudspeaker cabinets are equipped with threaded inserts,
loudspeaker stand mounts, flying fittings, etc. The cabinets must only be used with original d&b accessories in strict accordance with
the assembly instructions. Especially when flying loudspeakers,
users must strictly observe the Safe Working Load (SWL) specified
for each rigging component or rigging assembly used.
The d&b Rigging Accessories manual describes the correct assembly and use of the rigging components for d&b loudspeakers.
4.1.
IMPORTANT!
Connections
All active system loudspeakers are fitted with an 8-pin CA-COM
connector mounted on a metal panel, recessed to protect it from
accidental damage - the panel also bears the cabinet serial number details.
The different active speaker systems use different connector pin assignments which are printed next to the speaker output connector
on the controller module rear panel.
The d&b SpeakerID circuit used for the active systems prevents damage
if the wrong speaker is inadvertedly connected to an A1 mainframe.
(4.0E)
4-1
4-2
A1 User Manual
4.2.
Data sheets for the loudspeakers
On the following pages you will find data sheets for the d&b
loudspeakers which can be operated with the A1 mainframe. The
data sheets contain information about the loudspeakers and
operation with their respective A1 controller settings.
The following data sheets are a compilation of the individual data
sheets for the d&b loudspeakers. Please note that the version
number for the individual data sheets, shown as a footnote on the
respective pages, can differ from the version number of this
manual.
− F1220
− F1222
− M1220
− M2
− F2
− B1-SUB
− B2-SUB
(4.0E)
4-3
F1220
The F1220 is a compact, actively driven, 2-way full-range
loudspeaker which uses a 12" LF driver and 2" HF compression
driver in an arrayable bass reflex cabinet. The HF driver is coupled
to a 60° x 40° (h x v) constant directivity (CD) horn.
The F1220 cabinet is constructed from marine plywood coated with
an impact resistant paint. Recessed handles are fitted along with a
rigid steel grill and acoustically transparent foam front. A pair of
countersunk M10 threaded inserts are provided on top and bottom
to accept stand adapters and mounting frames. The top, bottom
and rear panels of the cabinet also have flying tracks to accept
rigging hardware.
With a frequency response extending from 60 Hz to over 16 kHz,
the F1220 can be used in many applications without the need for a
separate subwoofer system. The relatively narrow dispersion angle
and high SPL capability of the F1220 allow it to provide coverage
to 20 m and beyond.
The F1220 is recommended for applications where high quality
sound reinforcement, particularly of speech and vocals, is a critical
requirement. The neutral reproduction, suberb transient response
and precise imaging of the 1220 system stems from the use of very
low distortion drivers. The system is able to cleanly reproduce high
level programs and, when used with active subwoofers, forms a
formidable front-of-house system.
Angled rear side panels allow a pair of F1220 cabinets to be
placed side-by-side to form a twin cabinet cluster with 120°
horizontal coverage. F1220 cabinets can also be flown individually,
or as a speaker cluster - the design of the flying fittings enabling
the speakers to be rigged, aimed, and set at various angles without
the need for additional stabilising guylines. The extensive range of
fittings and rigging hardware for use with 1220 systems is detailed
in the d&b Rigging Accessories Manual.
The stage monitor version of the F1220, the M1220, has a similar
electro-acoustic performance and uses the same controller module,
but has a cabinet shape more suited to its principal role as a stage
monitor.
Two F1220 cabinets can be connected to a single A1 mainframe.
F1220 120° twin array
F1220 Data Sheet
F1220
1220-CO - Controls & indicators
Standard setting
On the top left of the module front panel are three configuration
switches. Yellow LEDs next to each switch illuminate when a switch
is selected. With no configuration switches selected, the connected
1220 loudspeakers will operate as a main, front-of-house system
without subwoofer support. A more balanced bass response is
obtained when the cabinets are deployed as a twin cabinet cluster
or operated in half space, placed on a stage or mounted on a
wall.
CUT switch and indicator
With the CUT switch selected, the frequency and phase response of
1220 loudspeakers is modified for operation with d&b B1-SUB,
B2-SUB or E18-SUB active subwoofer systems.
CUT
1220-CO
MON
OV HI
LFC
OV LO
GR HI
ID
GR LO
MUTE
ISP
0
-6
-18
-12
MON switch and indicator
With the MON switch selected, the controller module is configured
to drive the M1220 stage monitor. The MON setting introduces a
1.5 dB lift between 500 Hz and 3 kHz. The CUT and LFC switches
will still function whatever the setting of the MON switch. The
MON switch should not be selected when driving F1220 cabinets.
0
-3
dB
+3
HI dB
1220-CO controls & indicators
LFC switch and indicator
LFC stands for "low frequency correction". With the LFC switch
selected, bass level boost is applied to compensate for the LF loss
encountered when cabinets are deployed in full space - flown or
stand mounted. The LFC switch is automatically disabled when CUT
is selected.
HI level control
The HI level control has a +/–3 dB range and cuts or boosts HF
response above 1 kHz. For a linear frequency response, the HI
level control should be set to its 0 dB position.
Recommended subwoofer level control settings
With the 1220-CO level control set to 0 dB, subwoofer level
controls should be set to the following values:
− B1-SUB:
0 dB
− B2-SUB:
approx. –8 dB
− 1 x E18-SUB:
+3 dB
− 2 x E18-SUB:
–3 dB
1220
Controller module rear panel
Two 8-pin, identically wired, CA-COM output sockets are fitted to
the module rear panel. To avoid a potential shock hazard, if a
single F1220 loudspeaker is connected, the pins on the unused
socket are internally isolated from the mainframe power amplifier
outputs.
Internal speaker wiring
OUTPUT 2
PIN ASSIGNMENT
A LOW OUT +
B
LOW OUT -
C
SPEAKER ID
D SPEAKER ID
When replacing the 12“ driver, ensure that the red lead is
connected to the black terminal on the driver, and vice versa. The
HF driver is wired normally - red lead to the red terminal.
E
SENSE DRIVE +
F
SENSE DRIVE -
G HIGH OUT +
H HIGH OUT -
1220-CO rear panel
F1220
(1.1E)
OUTPUT 1
Dispersion characteristics
The diagrams below show dispersion angle vs frequency plotted
using lines of equal sound pressure (isobars) at -6 dB and -12 dB.
The nominal 60° horizontal dispersion is maintained from 17 kHz
down to 2 kHz.
F1220 isobar diagram
F1220 Data Sheet
F1220
Technical specifications
F1220 System data
Frequency response F1220 (–5 dB) ...................................................... 60 Hz to 16 kHz
Max. sound pressure (1 m)........................................................................................134 dB
(SPLmax peak, test signal pink noise with crest factor 4)
Input level for max. sound pressure.....................................................................+15 dBu
Input level for 100 dB-SPL / 1 m.......................................................................... –13 dBu
Polarity to controller INPUT (XLR pin 2: + / 3: –) .....................................LF: – /HF: +
F1220 loudspeaker
Nominal impedance (LOW / HIGH)............................................................8 / 16 ohms
Power handling capacity LOW (RMS / peak 10 ms) ........................ 300 / 1200 W
Power handling capacity HIGH (RMS / peak 10 ms) ..............................50 / 200 W
Nominal dispersion angle (hor. x vert.)............................................................. 60° x 40°
Connection..................................................................................... 8-pin CA-COM, female
...................................... Pin assignments printed on the controller module rear panel
Weight.............................................................................................................. 37 kg (81.5 lb)
10
5
0
-5
-10
-15
-20
-25
-30
20
100
1k
10k
20k
F1220 frequency response (on and 30°off the horizontal axis)
F1220 cabinet dimensions in mm [inch]
d&b audiotechnik AG, Eugen-Adolff-Str. 134, D-71522 Backnang, Germany, Phone +49-7191-9669-0, Fax +49-7191-95 00 00
F1220
(1.1E)
F1222
The F1222 is a compact, actively driven, 2-way full-range
loudspeaker which uses a 12" LF driver and 2" HF compression
driver in an arrayable bass reflex cabinet. The HF driver is coupled
to a 60° x 40° (h x v) constant directivity (CD) horn. As an option
the F1222 loudspeaker can be equipped with a 90° x 40° horn.
The F1222 cabinet is constructed from marine plywood coated with
an impact resistant paint. Recessed handles are fitted along with a
rigid steel grill and acoustically transparent foam front. A pair of
countersunk M10 threaded inserts are provided on top and bottom
to accept stand adapters and mounting frames. The top, bottom
and rear panels of the cabinet also have flying tracks to accept
rigging hardware.
With a frequency response extending from 60 Hz to over 16 kHz,
the F1222 can be used in many applications without the need for a
separate subwoofer system. The relatively narrow dispersion angle
and high SPL capability of the F1222 allow it to provide coverage
to 20 m and beyond.
The F1222 is recommended for applications where high quality
sound reinforcement, particularly of speech and vocals, is a critical
requirement. The neutral reproduction, suberb transient response
and precise imaging of the 1222 system stems from the use of very
low distortion drivers. The system is able to cleanly reproduce high
level programs and, when used with active subwoofers, forms a
formidable front-of-house system.
Angled rear side panels allow a pair of F1222 cabinets to be
placed side-by-side to form a twin cabinet cluster with 120°
horizontal coverage. F1222 cabinets can also be flown individually,
or as a speaker cluster - the design of the flying fittings enabling
the speakers to be rigged, aimed, and set at various angles without
the need for additional stabilising guylines. The extensive range of
fittings and rigging hardware for use with 1222 systems is detailed
in the d&b Rigging Accessories Manual.
Two F1222 cabinets can be connected to a single A1 mainframe.
Compatibility to 1220 systems
The F1222 loudspeaker uses a different 12“ low frequency driver
than the F1220. Both systems have identical power handling capacity and acoustical quality. For sound reasons the F1222 loudspeaker should not be driven with a 1220 controller.
1220 and 1222 systems operated with their respective controllers
are acoustically compatible. With a switch at its front the 1222
controller module can be set to drive 1220 loudspeakers.
F1222 120° twin array
F1222 Data Sheet
F1222
1222 controller module switches
Standard setting
With no configuration switches selected, the connected 1222 loudspeakers will operate as a main, front-of-house system without
subwoofer support.
CUT switch and indicator
With the CUT switch selected, the frequency and phase response of
1222 loudspeakers is modified for operation with d&b B1-SUB,
B2-SUB or E18-SUB active subwoofer systems.
1222
CUT
HFC
OV HI
1220
OV LO
GR HI
ID
GR LO
MUTE
ISP
HFC switch and indicator
HFC stands for "high frequency correction". With the HFC switch
selected, the frequency range above 10 kHz is lifted.
1220 switch and indicator
The 1220 switch configures the controller module to drive F1220
loudspeakers. This setting is identical to the basic setting of the
1220 controller module.
HI level control
The HI level control has a +/–3 dB range and cuts or boosts HF
response above 1 kHz. For a linear frequency response, the HI
level control should be set to its 0 dB position.
0
0
-6
-18
-12
-3
+3
dB
HI dB
Controls on 1222 controller module
Recommended subwoofer level control settings
With the 1222-CO level control set to 0 dB, subwoofer level
controls should be set to the following values:
− B1-SUB:
0 dB
− B2-SUB:
approx. –8 dB
− 1 x E18-SUB:
+3 dB
− 2 x E18-SUB:
–3 dB
Controller module rear panel
Two 8-pin, identically wired, CA-COM output sockets are fitted to
the module rear panel. To avoid a potential shock hazard, if a
single F1222 loudspeaker is connected, the pins on the unused
socket are internally isolated from the mainframe power amplifier
outputs.
Internal speaker wiring
1220
1222
When replacing the 12“ driver, ensure that the red lead is
connected to the black terminal on the driver, and vice versa. The
HF driver is wired normally - red lead to the red terminal.
OUTPUT 2
PIN ASSIGNMENT
OUTPUT 1
A LOW OUT +
B
LOW OUT -
C
SPEAKER ID
D SPEAKER ID
E
SENSE DRIVE +
F
SENSE DRIVE -
G HIGH OUT +
H HIGH OUT -
1222 controller rear panel
F1222
(1.1E)
Dispersion characteristics
The diagrams below show dispersion angle vs frequency plotted
using lines of equal sound pressure (isobars) at -6 dB and -12 dB.
F1222 (60°x40°) isobar diagrams
F1222 Data Sheet
F1222
Technical specifications
F1222 System data
Frequency response (–5 dB) ................................................................... 60 Hz to 16 kHz
Max. sound pressure (1 m)........................................................................................134 dB
(SPLmax peak, test signal pink noise with crest factor 4)
Input level for max. sound pressure.....................................................................+18 dBu
Input level for 100 dB-SPL / 1 m.......................................................................... –13 dBu
Polarity to controller INPUT (XLR pin 2: + / 3: –) .....................................LF: – /HF: +
F1222 loudspeaker
Nominal impedance (LOW / HIGH)............................................................8 / 16 ohms
Power handling capacity LOW (RMS / peak 10 ms) ........................ 300 / 1200 W
Power handling capacity HIGH (RMS / peak 10 ms) ..............................50 / 200 W
Nominal dispersion angle (hor. x vert.)............................................................. 60° x 40°
Connection..................................................................................... 8-pin CA-COM, female
...................................... Pin assignments printed on the controller module rear panel
Weight................................................................................................................. 35 kg (78 lb)
10
5
0
-5
-10
-15
-20
-25
-30
20
100
1k
10k
20k
F1222 frequency response, standard, CUT and HFC switch settings
F1222 cabinet dimensions in mm [inch]
d&b audiotechnik AG, Eugen-Adolff-Str. 134, D-71522 Backnang, Germany, Phone +49-7191-9669-0, Fax +49-7191-95 00 00
F1222
(1.1E)
M1220
The M1220 is a compact, actively driven, 2-way stage monitor
which uses a 12" LF driver and 2" HF compression driver in an
arrayable bass reflex cabinet. The HF driver is coupled to a
40° x 60°(h x v) constant directivity (CD) horn.
Constructed from marine plywood coated with an impact resistant
pain, the M1220 cabinet is fitted with recessed handles and a rigid
steel grill with an acoustically transparent foam front. Flying tracks
to accept rigging hardware are also fitted to the base and rear
panel of the cabinet.
The frequency response of the M1220 extends from 70 Hz to over
16 kHz, and the use of low distortion drivers ensures neutral
reproduction, suberb transient response and precise imaging.
A pair of M1220 cabinets side-by-side, with angled side panels
together, forms an 80° horizontal coverage stage monitor array.
M1220 cabinets can also be used as flown delays or as a centre
cluster - when flown, because of the position of the flying tracks,
the cabinets are suspended upside down. An extensive range of
fittings and rigging hardware is detailed in the d&b Rigging
Accessories Manual.
The front-of-house version of the M1220, the F1220, has a similar
electro-acoustic performance, uses the same controller module, but
has an arrayable cabinet shape more suited to its role as a main
system cabinet. When the M1220 is used, the MON switch on the
controller module is selected.
Two M1220 cabinets can be connected to a single A1 mainframe.
M1220 twin cabinet array
M1220 Data Sheet
M1220
1220-CO Controls and indicators
Standard setting
On the top left of the module front panel are three configuration
switches. Yellow LEDs next to each switch illuminate when a switch
is selected. With no configuration switches selected, the connected
1220 loudspeakers will operate as a main, front-of-house system
without subwoofer support. When using a mixture of F1220 and
M1220 cabinets front-of-house, the greatest compatiblity in the mid
to treble range is obtained with no configuration switches selected.
A more balanced bass response is obtained when the cabinets are
deployed as a twin cabinet cluster or operated in half space,
placed on a stage or mounted on a wall.
CUT switch and indicator
With the CUT switch selected, the frequency and phase response of
1220 loudspeakers is modified for operation with d&b B1-SUB,
B2-SUB or E18-SUB active subwoofer systems.
MON switch and indicator
With the MON switch selected, the controller module is configured
to drive the M1220 stage monitor. The MON setting introduces a
1.5 dB lift between 500 Hz and 3 kHz. The CUT and LFC switches
function whatever the setting of the MON switch. The MON switch
should not be selected when driving the F1220.
CUT
1220-CO
MON
OV HI
LFC
OV LO
GR HI
ID
GR LO
MUTE
ISP
0
0
-6
-18
-12
-3
dB
+3
HI dB
1220-CO controls & indicators
LFC switch and indicator
LFC stands for "low frequency correction". With the LFC switch
selected, bass level boost is applied to compensate for the LF loss
encountered when cabinets are deployed in full space e.g. flown.
The LFC switch is automatically disabled when CUT is selected.
HI level control
The HI level control has a +/–3 dB range and cuts or boosts HF
response above 1 kHz. For a linear frequency response, the HI
level control should be set to the 0 dB position.
Controller module rear panel
Two 8-pin, identically wired, CA-COM output sockets are fitted to
the module rear panel. To avoid a potential shock hazard, if a
single 1220 loudspeaker is connected, the pins on the unused
socket are internally isolated from the mainframe power amplifier
outputs.
1220
Internal speaker wiring
When replacing the 12“ driver, ensure that the red lead is
connected to the black terminal on the driver, and vice versa. The
HF driver is wired normally - red lead to the red terminal.
OUTPUT 2
PIN ASSIGNMENT
A LOW OUT +
B
LOW OUT -
C
SPEAKER ID
D SPEAKER ID
E
SENSE DRIVE +
F
SENSE DRIVE -
G HIGH OUT +
H HIGH OUT -
1220-CO rear panel
M1220
(1.1E)
OUTPUT 1
Technical specifications
M1220 System data
Frequency response M1220 (–5 dB, free field) .................................70 Hz to 16 kHz
Frequency response M1220 (–5 dB, floor coupling) ........................60 Hz to 16 kHz
Max. sound pressure (1 m) ....................................................................................... 134 dB
(SPLmax peak, test signal pink noise with crest factor 4)
Input level for max. sound pressure.................................................................... +15 dBu
Input level for 100 dB-SPL / 1 m .......................................................................... –13 dBu
Polarity to controller INPUT (XLR pin 2: + / 3: –) ...................................LF: – / HF: +
M1220 stage monitor
Nominal impedance (LOW/HIGH).............................................................. 8 / 16 ohms
Power handling capacity LOW (RMS / peak 10 ms)..........................300 / 1200 W
Power handling capacity HIGH (RMS / peak 10 ms)...............................50 / 200 W
Nominal dispersion angle (hor. x vert.) ............................................................. 40° x 60°
Connection..................................................................................... 8-pin CA-COM, female
...................................... Pin assignments printed on the controller module rear panel
Weight ................................................................................................................. 34 kg (75 lb)
10
5
0
-5
-10
-15
-20
-25
-30
20
100
1k
10k
20k
M1220 stage monitor frequency response, controller set to
MON. (Free-field frequency response, standard setting, similar
to F1220)
M1220 cabinet dimensions in mm [inch]
M1220 Data Sheet
M1220
M2
The M2 is a high performance 2-way active monitor system using
two 12" LF drivers in an airflow-optimised bass-reflex cabinet. It
contains a 1.4" HF driver using a compact but extremely strong
neodymium magnet assembly, mounted on a low distortion horn
optimized for monitor applications. The design allows the use of a
low height cabinet while achieving a constant directivity from an
unusual 600 Hz upwards with a nominal dispersion of 45° (h) x 60°
(v). Together with the cabinets baffle angle of 40° (to floor), this
dispersion offers a realistic artist listening area starting directly
above the cabinet and ranging for quite a distance upstage.
The M2 is driven actively using the A1 mainframe with M2
controller module. Two M2 cabinets can be driven from one A1
mainframe.
The M2 cabinet is constructed from marine plywood and has an
impact resistant paint finish. The cabinet is protected by a rigid
metal grill backed with an acoustically transparent foam. Two
fittings which accept Ball-lock shackle pins are located on both
sides of the cabinet allowing quick and flexible rigging. Fitted on
the rear panel are two CA-COM connectors allowing linking of
paired cabinets.
The M2, as a 2-way high performance monitor producing a remarkable
peak sound pressure level of 143 dB – the most powerful d&b system so
far, provides a constant directivity which raises the feedback level
significantly and gives very direct voice reproduction. The M2 bestows
its full dynamics across the entire frequency range without compromising
the solo voices or instruments, which always stay clearly and audibly in
front of the mix.
For applications which require deep bass, the LF response can be
extended by using additional active subwoofer system C7-SUB.
M2 stage monitor
M2 Data sheet
M2
M2-CO Controls and indicators
CUT switch and indicator
Set to CUT, a high pass filter with a 110 Hz cut-off frequency is
inserted in the controller signal path. The yellow CUT LED
illuminates. M2 is now configured for use with d&b C7-SUB active
subwoofer.
LFC level control
The detented Low Frequency Coupling control adjusts the systems
lo- and lo-mid response to different operating environments of the
M2 system.
The FLOOR position is the standard setting for a single M2, used
as floor monitor.
Turning the control to the PAIR position, the lo- and lower mid
frequency range is more and more reduced (Corner frequency
about 600Hz). The maximum left position fully compensates the
different coupling behaviour of the low and high frequencies when
two cabinets are used in a paired monitor application.
Turning towards FREE increases the systems low end for operation
without floor coupling (e.g. flown).
Indicators
These indicators give a three stage indication of the M2 Controller
signal levels.
6
5
4
3
FREE
2
1
0
-1
-2
PAIR
-3
-4
-5
-6
10
100
M2
CUT
OV HI
OV LO
GR HI
ID
GR LO
MUTE
ISP
0
FLOOR
+6
-6
PAIR
-12
dB
FREE
LF COUPLING
Controls and indicators
M2 Controller Modul
Level Control
The detented level control adjusts the controller input sensitivity. It
has a 20 dB range (–14 dB ... +6 dB) calibrated in 1 dB steps. The
controls are normally set to 0 dB.
Connector
The M2 controller incorporates one CA-COM 8 pin output for
driving one or two (linked) M2 loudspeakers. Different from the
F-series controller, the M2 controller uses female connectors for
protection against contact.
The M2 cabinet incorporates two CA-COM (male/female)
connectors for easy linking of two cabinets.
M2 Controller,
CA-COM connector plate
M2
(4.0E)
10k
Frequency responce LFC-Funktion (min. and
max.)
− ISP (Input Signal Present, green) illuminates when the signal
presented to the controller input exceeds a –36 dBu threshold
value. The ISP circuit is unaffected by the setting of the
controller mute switch and level control.
− GR (Gain Reduction, yellow) illuminates when the controller
limiter reduces gain by more than 3 dB.
− OV (Overload red) illuminates when the controller limiter
reduces gain by more than 12 dB or overload occurs in the
signal path (input signal too high) or when the amplifier gain is
reduced because the output current is too high (e.g. due to a
short circuit).
The limiter indicators show the stage of the HF and LF channels
independently.
1k
Dispersion characteristics
The diagram below shows dispersion angle v. frequency plotted
using lines of equal sound pressure (isobars) at –6 dB and –12 dB.
The nominal 45° horizontal dispersion angle is maintained from
800 Hz to 10 kHz.
M2 isobar diagram horizontal
M2 isobar diagram vertical
M2 Data sheet
M2
Frequency response
The graph below shows the frequency response of the M2 system
in floor monitor position, measured in a height of 1.7m (listening
pos. in monitor operation) on axis:
10
5
0
-5
-10
-15
-20
-25
-30
20
100
1k
10k
20k
M2 frequency response, monitor operation
Technical specifications
M2 system data
Frequency response (–5 dB, free field) ..................................................56 Hz – 17 kHz
Frequency response (-5 dB, floor coupling)..........................................50 Hz – 17 kHz
Max. sound pressure level (1 m, free field) .........................................................143 dB
(SPLmax peak, pink noise test signal with crest factor of 4)
Input level (SPLmax)..................................................................................................+18 dBu
Input level (100 dB-SPL / 1 m) .............................................................................. –26 dBu
Polarity to controller INPUT (XLR pin 2: + / 3: –) ...................................LF: – / HF: –
M2 loudspeaker
Nominal impedance LOW/HIGH .................................................................. 4 / 8 ohms
Power handling capacity LOW (RMS / peak 10 ms).......................... 500 / 2000 W
Power handling capacity HIGH (RMS / peak 10 ms) ..............................50 / 200 W
Nominal dispersion angle (h x v)....................................................................... 45° x 60°
Connections ........................................................................................... 2 x 8-pin CA-COM
Weight................................................................................................................. 38 kg (83 lb)
M2 cabinet dimensions in mm [inch]
d&b audiotechnik AG, Eugen-Adolff-Str. 134, D-71522 Backnang, Germany, Phone +49-7191-9669-0, Fax +49-7191-95 00 00
M2
(4.0E)
F2
The F2 is an actively driven, 2-way full-range loudspeaker which
uses a pair of 12" LF/mid range drivers and a 2" HF compression
driver in a horn loaded cabinet. The HF driver is coupled to a
60° x 40° (h x v) constant directivity (CD) horn.
The F2 cabinet is constructed from marine plywood coated with an
impact resistant paint. Fitted to the cabinet sides are recessed
handles and rigging stud plates. On the front is a rigid steel grill
with an acoustically transparent foam cover. Catches to secure an
optional protective transport cover are also fitted to the top and
bottom front edges of the cabinet. Heavy duty wheels are fitted on
the back panel along with ratchet strap guides and countersunk
M10 threaded inserts for attaching safeties and additional rigging.
With a frequency response extending from 80 Hz to over 16 kHz,
the F2 system can be used on its own for speech and vocal
reinforcement. Adding active subwoofers, B2-SUB or C4-SUBs,
extends the capability of the F2 system to high level music
reinforcement.
The relatively narrow dispersion and concentrated directivity of the
F2 is a result of using horn loaded 12“ drivers to cover the mid
range. Directivity is well maintained towards the low end of the cabinet’s response - 90° at 600 Hz and 60° from 800 Hz upwards.
The high SPL capability of the F2 design makes it suitable for use in
large venues to cover distances to 30 m and beyond.
The C4/F2/B1 Flying System, described in the d&b Rigging
Accessories Manual, allows the safe and speedy construction of
flown arrays of C4, F2 and B1 loudspeakers.
F2/B1 rigging
F2 Data Sheet
F2
F2-CO Controller module - Controls & indicators
Standard setting
A single configuration switch (CUT) is located on the top left of the
module front panel. A yellow LED next to the switch illuminates
when it is selected. With the configuration switch not selected, the
F2 system is configured for speech and vocal reproduction without
subwoofer support.
CUT switch and indicator
With the CUT switch selected, the frequency and phase response of
F2 loudspeakers is modified for operation with d&b B1-SUB,
B2-SUB, C4-SUB or E18-SUB active subwoofer systems.
F2-CO
CUT
OV HI
OV LO
GR HI
ID
GR LO
MUTE
ISP
0
HI level control
The HI level control has a 0 to –6 dB range and cuts the HF
response above 1 kHz. For distances beyond 20 m, the control
should be set to its 0 dB position. For close coverage, below 20 m,
a better balance is obtained with the control set to -3dB.
0
-6
-2
-18
-12
dB
-6
-4
HI dB
F2-CO controls
Recommended subwoofer level control settings
With the F2-CO level control set to 0 dB, subwoofer level controls
should be set to the following values:
− B2-SUB:
–3 dB
− 2 x C4-SUB:
0 dB
− 2 x E18-SUB:
+2 dB
− 2 x B1-SUB:
–1 dB
− B1-SUB:
0 dB, F2-CO at –5 dB
Controller module rear panel
A single 8-pin CA-COM output socket is fitted to the module rear
panel.
F2
PIN ASSIGNMENT
A LOW OUT +
B
LOW OUT -
C
SPEAKER ID
D SPEAKER ID
E
SENSE DRIVE +
F
SENSE DRIVE -
G HIGH OUT +
H HIGH OUT -
F2-CO rear panel
F2
(1.1E)
OUTPUT
Technical specifications
F2 System data
Frequency responce (–5 dB) ...................................................................80 Hz to 16 kHz
Max. sound pressure (1 m) ....................................................................................... 136 dB
(SPLmax peak, test signal pink noise with crest factor 4)
Input level for max. sound pressure.................................................................... +11 dBu
Input level for 100 dB-SPL / 1 m .......................................................................... –22 dBu
Polarity to controller INPUT (XLR pin 2: + / 3 –).....................................LF: – / HF: +
F2 loudspeaker
Nominal impedance (LOW / HIGH)........................................................... 4 / 16 ohms
Power handling capacity LOW (RMS / peak 10 ms)..........................500 / 2000 W
Power handling capacity HIGH (RMS / peak 10 ms)...............................50 / 200 W
Nominal dispersion angle (hor. x vert.) ............................................................. 60° x 40°
Connection..................................................................................... 8-pin CA-COM, female
...................................... Pin assignments printed on the controller module rear panel
Weight ...............................................................................................................77 kg (170 lb)
F2 cabinet dimensions in mm [inch]
F2 Data Sheet
F2
B1-SUB
The B1-SUB is an actively driven subwoofer which uses a pair of
15" LF drivers mounted in a bass reflex cabinet.
The cabinet is constructed from marine plywood coated with an
impact resistant paint. Fitted to the cabinet sides are recessed
handles and rigging stud plates. On the front is a rigid steel grill
with an acoustically transparent foam cover. Catches to secure an
optional protective transport cover are also fitted to the top and
bottom front edges of the cabinet. Heavy duty wheels are fitted on
the back panel along with ratchet strap guides and countersunk
four M10 threaded inserts for attaching safeties and additional
rigging.
The frequency response of the B1-SUB extends from 32 Hz to 110
Hz. The B1 generates a warm, low bass - ideal for use with the
1220 system.
B1-CO
The B1-SUB can also be used as an F2 system subwoofer. For a
well balanced sound at full output, two B1-SUBs to each F2 should
be used. The dimensions, shape and the fittings used on the B1-SUB
cabinet match those of the F2 cabinet making it particularly easy to
deploy a mixed F2/B1 system - stacked or flown.
B1-CO - Controls & indicators
OV
ID
GR
MUTE
ISP
Since the B1-CO controller module is not fitted with any special
controls or configuration switches, its standard controls are
covered in the general controller module description in Section 3.2
of the A1 user manual. Please also refer to the descriptions of the
1220 and F2 systems for recommended subwoofer level settings.
Controller module rear panel
0
A single 8-pin CA-COM output socket is fitted to the module rear
panel.
-6
-18
-12
dB
Technical specifications
B1-CO controls
B1-SUB system data
Frequency response (–5 dB)....................................................................32 Hz to 110 Hz
Maximum sound pressure (1 m, full space).......................................................... 131 dB
(SPLmax peak, test signal pink noise with crest factor 4)
Input level for max. sound pressure.................................................................... +16 dBu
Input level for 100 dB-SPL / 1 m .......................................................................... –12 dBu
Polarity to controller INPUT (XLR pin 2: + / 3 –).................................................... LF: +
B1
B1-SUB subwoofer
PIN ASSIGNMENT
A LOW OUT +
B
LOW OUT -
C
SPEAKER ID
OUTPUT
Nominal impedance .................................................................................................. 4 ohms
Power handling capacity (RMS / peak 10 ms)......................................600 / 2400 W
Connection..................................................................................... 8-pin CA-COM, female
...................................... Pin assignments printed on the controller module rear panel
Weight ................................................................................................................63 kg (139 lb
D SPEAKER ID
E
nc
F
nc
G SENSE DRIVE +
H SENSE DRIVE -
B1-CO rear panel
B1-SUB Data Sheet
B1-SUB
B1-SUB cabinet dimensions in mm [inch]
d&b audiotechnik AG, Eugen-Adolff-Str. 134, D-71522 Backnang, Germany, Phone +49-7191-9669-0, Fax +49-7191-95 00 00
B2-SUB
The B2-SUB is an actively driven subwoofer which uses a pair of
18" LF drivers mounted in a bandpass horn cabinet.
The cabinet is constructed from marine plywood coated with an
impact resistant paint. Fitted each side of the cabinet sides are four
recessed handles and, on the rear panel, four heavy duty wheels.
On the front is a rigid steel grill with a replaceable acoustically
transparent foam cover. Catches to secure an optional protective
transport cover are also fitted to the top and bottom front edges
of the cabinet.
The width and height of the B2-SUB front panel is identical to that
of two side-by-side C4 cabinets making it particularly easy to stack
an array of B2-SUBs and C4 cabinets. The B2-SUB can be
operated standing vertically or placed on its side horizontally.
The frequency response of the B2-SUB extends from 37 Hz to 125
Hz (–5 dB) with a peak sound pressure level of 139 dB-SPL. The B2
system is therefore ideal for use with the F2 system to provide high
SPL coverage in large venues.
B2-CO - Controls & indicators
INFRA switch and indicator
A single configuration switch (INFRA) is located on the top left of
the module front panel. A yellow LED next to the switch illuminates
when it is selected. Selecting the INFRA switch restricts the B2 frequency response to a narrow, 32 Hz to 68 Hz range (–5 dB). This
transforms a B2 system into an infrabass system for use with the C4
system. B2-SUBs can also be used as an infrabass system when
C4-SUBs are used along with C6 or F2 cabinets.
Controller module rear panel
B2-CO
INFRA
A single 8-pin CA-COM output socket is fitted to the module rear
panel. An additional balanced XLR output marked C4-OUT is also
provided on the module rear panel. The C4-OUT signal can be
used to drive C4-SUB controller inputs when a B2 system is used as
an infrabass system for C4-SUBs. In the event of a power or mainframe failure, a bypass relay in the B2-CO controller module will
connect the pins of the C4-OUT socket directly to those of the
module INPUT socket allowing the continued operation of the
C4-SUB and TOP systems.
OV
ID
GR
MUTE
ISP
0
-6
+6
-12
dB
B2-CO controls
B2-SUB Data Sheet
B2-SUB
Using the C4-OUT socket to drive C4-SUBs
Although the C4-SUB operates very effectively down to 50 Hz
(–5 dB), in some applications the ability to reproduce frequencies
below this cut-off frequency can be an advantage. Using the B2
subwoofer, not only provides the desired LF extension, but also
improves the low frequency headroom of the combined system.
Selecting the INFRA switch on the B2 controller module front panel
configures the B2 system to operate around 50 Hz covering a one
octave band from 32 Hz to 68 Hz ( –5 dB). Used in INFRA mode, a
B2 system, with just a single cabinet, delivers enough low-end bass
to match the output of four C4-SUB cabinets. When C4-SUBs and
B2-SUBs are operated together in an identical acoustic
environment and their controllers set to the same level, the low
frequency limit of the combined system is 37 Hz (–5 dB).
With fewer than four C4-SUBs per B2 cabinet, the headroom of
the C4 system can be increased by altering the crossover point between the two bass systems simply by driving the C4-SUB
systems from the C4-OUTPUT provided on the rear panel of the
B2-CO controller.
*
C4 OUT
INPUT
INPUT LINK
OUTPUT
PIN ASSIGNMENT
A LOW OUT +
B LOW OUT C SPEAKER ID
D SPEAKER ID
E SENSE DRIVE +
F SENSE DRIVE G nc
H nc
B2-CO rear panel
The B2-CO controller C4-OUT socket provides a specially tailored
signal with a relatively narrow-band level reduction around 50 Hz
- the rest of the audio band remains unaffected. It therefore does
not matter whether the mid/high cabinets (C4-TOPs or C6) are
driven directly or via the C4-OUT - the signal they produce is the
same in each case.
Used with a B2 system and driven from the C4-OUT socket, the
low frequency limit of the C4-SUBs is raised to around 60 Hz. This
raised crossover frequency is not acoustically critical, and is in fact
beneficial, since the band below 60 Hz is more than adequately
handled by the B2 system. If most of the C4-SUBs are flown, then
due to the loss of ground coupling, the effective (acoustic) LF
output of the system is reduced. Despite that, the increased LF headroom using the C4-OUT connection still gives a worthwhile
improvement to the LF performance of the combined system.
10
5
0
-5
-10
-15
-20
-25
-30
20
100
500
C4 and B2-SUBs, 4:1 ratio
10
5
0
-5
-10
-15
-20
-25
-30
20
100
C4 system driven from C4-OUT and B2SUB, 2:1 ratio (acoustic)
B2-SUB
(1.1E)
500
Technical specifications
B2-SUB system data (standard/INFRA)
Frequency response (–5 dB)................................ 37 Hz to 125 Hz / 32 Hz to. 68 Hz
Max. sound pressure (1 m, full space) .................................................139 dB / 136 dB
(SPLmax peak, test signal pink noise with crest factor 4)
Input level for max. sound pressure.............................................. +16 dBu / +14 dBu
Input level for 100 dB-SPL / 1 m ....................................................–20 dBu / –19 dBu
Polarity to controller INPUT (XLR pin 2: + / 3: –) .................................................. LF: +
B2-SUB subwoofer
Nominal impedance ................................................................................................... 4 ohms
Power handling capacity (RMS / peak 10 ms)......................................600 / 2400 W
Connection..................................................................................... 8-pin CA-COM, female
...................................... Pin assignments printed on the controller module rear panel
Weight ............................................................................................................ 102 kg (225 lb)
10
5
0
-5
-10
-15
-20
-25
-30
20
100
500
B2-SUB/ F2 frequency response
B2-SUB cabinet dimensions in mm [inch]
B2-SUB Data Sheet
B2-SUB
5. System operation
5.1.
Setting up/stacking the loudspeakers
To get the best out of any high quality loudspeaker system it must
be properly set up. Care and attention needs to be paid to the position of the loudspeaker cabinets relative to each other and also
to how they are angled and aimed towards the audience.
5.1.1. Vertical coverage
The aiming of the loudspeaker in the vertical plane is responsible
for the coverage all the way from the stage to the furthest listening
point. Both the height and vertical angle of the loudspeakers need
careful adjustment.
Speaker stands, mounting brackets and rigging fittings can be used
to vary the height and angle of cabinets used on their own or as
part of a speaker array. F1220 cabinets can either be flown or fitted with a swivel frame and placed on a stand. F2 cabinets can be
rigged and flown.
The lower the loudspeaker height, then the greater the sound level
difference between the audience area at the front of the stage and
the audience area at the extreme range of the loudspeaker coverage. To minimise the sound level difference between the stage
and the back of the room and ensure a more even level distribution the loudspeakers need to be placed as high as possible - within
reason.
In relatively confined spaces there is a risk of aiming too much
energy towards the rear wall and ceiling of a room, increasing the
reverberant component of the sound in the room. In the worst case, bad speaker aiming can create a highly audible slap echo from
the rear wall of the room - slightly tilting the loudspeaker cabinets
down towards the audience can reduce and alleviate this problem.
5.1.2. Arraying mid/high cabinets
With more than one loudspeaker source in a room, comb filter effects can create coverage problems. An unavoidable problem with
multiple sound sources, comb filtering creates a regularly spaced,
uneven frequency response across a coverage area due to constructive and destructive interference between the sources. The actual character of the comb filtering which occurs is related to the
physical spacing of the sound sources. Minimising this effect requires some experimentation - altering the distance between the cabinets to try and minimise path length differences between the loudspeakers and the listeners can help. Sometimes even small alterations to loudspeaker positions can have a dramatic effect on particulary prominent combing frequencies. Fortunately, in real situations, the masking effects of room reflections, room absorbtion, and
absorbtion due to the presence of an audience, all help to conceal
combing related coverage problems.
A related problem due to interference effects can occur when closely arraying loudspeaker cabinets. Arrays need to be constructed
so that the coverage patterns of the individual loudspeakers combine with minimal overlap. This problem has less to do with path di-
(4.0E)
5-1
stances (the distances between the sources in the array are so small
that any combing effect would only occur at relatively high frequencies) than with how closely defined and controlled the driver
dispersion patterns are. Once more, the design of the active systems cabinets, in particular the use of CD horns, largely eliminates
these problems and simplifies the creation of effective loudspeaker
arrays - placing F1220 cabinets with their rear side panels butted
together guarantees minimal dispersion pattern overlap and hence
minimal interference.
A final configuration trick, particularly useful in deep rooms where
more than one cabinet has to be used because a single cabinet has
insufficient throw for the level needed at the back of the room, is
to vertically stack the cabinets rather than horizontally array them
- this helps minimise audible interference and gives more vertical
directivity.
5.1.3. Stacking subwoofers
Regardless of the type and operating principles of the subwoofer
systems, the basic relationships of coverage and array directivity at
bass frequencies apply.
− Vertical subwoofer arrays have better bass ‘throw’. The increa-
sed vertical directivity of such arrays dissipates less energy in
the vertical plane.
− Wide subwoofer arrays, with their greater horizontal directivity,
are more effective when trying to achieve a more even level
distribution in the horizontal plane, e.g. between the centre and
sides of a coverage area. The typical bass emphasis on the
central axis between two front stacks can be reduced by outwardly rotating the two subwoofer arrays - the broader the array, the more even the coverage.
If a large number of subwoofers are available, then an L-shape
configuration can combine the best properties of the two variants.
The arrangement of subwoofers in flying arrays (F2/B1/C4 systems) is often determined by the position of the TOP cabinets, i.e.
the coverage requirements of the array. However, it is important
to ensure that the subwoofer systems are also arranged in groups
(blocks, rows or columns) in order to benefit from the coupling effects described above.
5-2
A1 User Manual
5.2.
Wiring
We recommend the use of good quality cables with a minimum
1.5 mm 2 conductor size - 2.5 mm2 is preferable.
d&b can supply MC8 CA-COM terminated cables (8 x 2.5 mm 2) in
various lengths. Especially for long cable runs, we recommend
using d&b MC1220 cable. The coaxial construction of MC1220 minimises crosstalk and external signal interference.
d&b SenseDrive can compensate for cable losses provided the sum
of the required voltage at the loudspeaker terminals and the voltage loss in the cable does not exceed the maximum available voltage the power amplifier can deliver. Therefore, the length of cable
run between mainframe and loudspeaker should be kept as short
as possible, particulary when the full output capability of the system is needed.
If in an installation very long cable runs are unavoidable, a conductor size greater than 2.5 mm 2 may be needed to reduce power
loss and to achieve an acceptable damping factor - the ratio of the
load impedance to the cable impedance being a critical factor. If
the size of the individual conductors in a cable is insufficient, then it
may help to ‘double-up’ the conductors to achieve an acceptable
thickness of copper.
The following ‘rule of thumb’ formula allows you to estimate the
maximum cable length with an acceptable damping factor (>10):
maximum (single) length of cable =
3 x load impedance [ Ω] x cross-section [mm ]
(4.0E)
5-3
5.3.
Level setting for mixed systems
A mixed system is one which uses a mixture of full range cabinets
and subwoofers. If equal numbers of full range cabinets and subwoofers are used then the correct balance and crossover frequency between the full range and subwoofer systems is assured provided the recommended controller module level settings are used.
These recommended settings, using various d&b subwoofer systems, are given in the sections of this manual describing the F1220
and F2 loudspeakers. Altering the ratio of full range to subwoofer
cabinets in a mixed system will need to be corrected by adjusting
the controller module level controls.
Extreme differences of level settings between full range and subwoofer systems should be avoided. Differences of more than approx. 3 dB will adversely affect the crossover frequency between
the systems and produce a deterioration in overall sound quality. If
- to achieve a better balance - a severe correction is neccessary,
it’s much better to use an external equaliser in the signal path before both the full range and subwoofer systems so that the level
correction is applied equally to both systems. This allows the frequency response of the whole system to be tailored to the acoustic
environment without unduly influencing the level, phase and frequency response of the full range and subwoofer systems relative
to each other.
The sensitivity values quoted for the systems are also a useful additional aid to relative level setting. The values given in the technical
specification for each loudspeaker give the input signal level expressed as a dBu value needed to produce a 100 dB (SPL) sound
pressure level measured at one metre.
Example: the 1220 system input sensitivity for a 100 dB-SPL is –13
dBu, and that for the E3 system is –10 dBu. For equal sound level
from E3 and 1220 loudspeakers used together, the 1220-CO level
control needs to be set 3 dB lower than that of the E3-CO.
5-4
A1 User Manual
6. Troubleshooting
n o so u n d
P O W E R sw itch o n ?
on
o ff
PO W ER LED
tu rn P O W E R sw itc h o n
fla sh in g
o ff
fla sh in g
ID L E D
no
fu se s o .k.?
no
re p la c e fu se
m a in s v o lta g e in
2 0 0 ..2 6 5 V ra n g e ?
no
su p p ly v o lta g e w ith in lim its
on
w ro n g b o x c o n n e c te d
T E M P L E D fla sh in g ?
yes
fa n w o rkin g ?
c le a n filte r fo a m
c h e c k a ir su p p ly
PRO T LED o n?
yes
IS P LE D o n ?
no
no
p o ssib ility o f A 1 fa ilu re
no
PRO T LED o n?
w a it m a x . 1 5 m in .
try a g a in
c h e c k sig n a l w irin g a n d
sig n a l so u rc e
C O / M m u te d ?
yes
C A -C O M s
fitte d c o rre c tly ?
no
c o rre c t b o x c o n n e c te d ?
no
w ire c o rre ctly
w o rk s w ith o th e r
sp e a k e r c a b le ?
yes
c a b le fa ilu re
w o rk s w ith o th e r b o x ?
yes
sp e a k e r fa ilu re
re le a se M U T E sw itc h
p re ss a n d re le a se
M U T E sw itc h
if still n o t o .k .:
tu rn P O W E R sw itc h o ff,
w a it 2 m in .,
tu rn P O W E R sw itc h o n
p o ssib ility o f A 1 fa ilu re
(4.0E)
6-1
7. Publications list
A number of publications with supplementary information on our
products are available. These publications are listed below along
with their respective catalogue numbers. If you are interested in receiving any of the listed publications then simply fill in the order
form on the last page of the User Manual, send it to d&b and we
will send you the requested information by return of post.
Title
Cat.No.
TI 208 A1 Controller Module Exchange
D5208.E.
TI 212 A1/P1200A Simple Remote Control Circuits
D5212.E.
TI 302 MC1220 cable, wiring with F-systems
D5302.INT.
TI 303 MC1220 cable, wiring with B1-SUB
D5303.INT.
TI 304 SOCAPEX - CA-COM adapter wiring
D5304.INT.
TI 323 C4-System configurations
D5323.E.
Rigging Accessories Manual
D2905.E.
d&b polar data disk for CADP2
D7501.000.
d&b polar data disk for EASE 2.x
D7502.000.
Brochure F-Series
D1102.E.
Brochure C4 System
D1310.E.
Brochure C6/C7 Systems
D1320.E.
Brochure E-Series
D1201.E.
Brochure d&b Monitors
D1401.E.
The Complete d&b
D0011.E.
International agents list
D9220.E.
Complete Publications list
D9300.E.
(4.0E)
7-1
8. EU declaration of conformity (CE symbol)
EU conformity of loudspeakers
This declaration applies to loudspeakers manufactured by d&b audiotechnik AG and includes the types listed in the table below:
Type
Typ No.
− F1220
Z0051/Z0052
− F1222
Z0055
− M1220
Z0054
− M2
Z0061
− F2
Z0021
− B1-SUB
Z0041
− B2-SUB
Z0056
All production versions of these types are included, provided they
correspond to the original technical version and have not been
subject to any later design or electromechanical modifications.
We hereby confirm that said products conform to the
protection requirements stipulated in Directive 90/
336/EEC of the Council of the European Communities
for harmonisation of the statutory regulations of the
Member States governing Electromagnetic Compatibility.
The products also meet the provisions of the Law
concerning the Electromagnetic Compatibility of Electrical Appliances (EMCA) of 9 November 1992 as well
as the First Amending Statute of the Law concerning
the Electromagnetic Compatibility of Electrical Appliances (1stEMCARev) of 30 August 1995.
The following relevant, harmonised standards were
taken as a basis for the assessment of electromagnetic compatibility:
DIN EN 55013:08-1991
DIN EN 55020:05-1995
DIN EN 50082-1:03-1993
d&b audiotechnik AG of Backnang accepts responsibility for this declaration.
(4.0E)
8-1
EU conformity of mainframes
This declaration applies to the A1 mainframe manufactured by d&b
audiotechnik AG consisting of the amplifier unit including the installed controller module.
Type
Type No.
− A1
Z0070, version .10 and
higher
− Controller modules
Z0080 - Z0085, all
All production versions of type A1 are included, provided they correspond to the original technical version and have not been subject
to any later design or electromechanical modifications.
We hereby confirm that said products conform to the
protection requirements stipulated in Directive 90/
336/EEC of the Council of the European Communities
for harmonisation of the statutory regulations of the
Member States governing electromagnetic compatibility.
The products also meet the provisions of the Law
concerning the Electromagnetic Compatibility of Electrical Appliances (EMCA) of 9 November 1992 as well
as the First Amending Statute of the Law concerning
the Electromagnetic Compatibility of Electrical Appliances (1stEMCARev) of 30 August 1995.
The following relevant, harmonised standards were
taken as a basis for the assessment of electromagnetic compatibility:
DIN EN 55022:05-1995 (Class B)
DIN EN 60555-2:06-1987
DIN EN 50082-1:03-1993
d&b audiotechnik AG of Backnang accepts responsibility for this declaration.
d&b audiotechnik AG, Eugen-Adolff-Str. 134, D-71522 Backnang, Germany, Phone +49-7191-9669-0, Fax +49-7191-95 00 00
A1 User Manual (4.0 E)
Insert this page into an envelope or fax machine and send it to:
d&b audiotechnik AG
Eugen-Adolff-Straße 134
D-71522 Backnang
Germany
Fax +49-7191-95 00 00
My address:
Please send me the following information:
Title
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Number
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Suggestions for improvements or comments on the manual and products:
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