MAX
Data Sheet
Safety precautions
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.
WARNING!
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.
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.
General Information
MAX Data Sheet
Version 3.0E, 05/2001, D2081.E.03
© by d&b audiotechnik AG 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
CAUTION!
MAX
MAX is a 2-way floor monitor system and uses a 15“/2“ coaxial
driver combination with a passive crossover. The driver design
allows the use of a compact, low height cabinet. MAX can be
driven actively or passively.
Coaxially mounting the 2“ HF and 15“ LF drivers creates a very
compact single driver whilst retaining the benefits of separate
magnetic assemblies. The drivers are positioned together to utilise
the combined shape and geometry of the LF cone and HF horn to
create a single waveguide with a controlled, symmetrical, 60°
conical dispersion.
The MAX cabinet is constructed from marine plywood and has an
impact resistant paint finish. The front of the loudspeaker cabinet is
fitted with a rigid metal grill covered with a replaceable
acoustically transparent foam. A socket to accept a loudspeaker
stand, a ratchet strap kelping bar and optional MAN CF4 studplates
for flying complete the possible rigging options for MAX. Fitted on
the rear panel are two parallel wired Speakon-NL4 or EP-5
connectors.
The MAX cabinet does not require special controller electronics. As
a stage monitor MAX is preferably operated with the P1200A
mainframe equipped with the ampMAX module. The ampMAX
module can be configured for passive or 2-way active operation.
The negligible signal delay with this type of construction closely
approximates the ideal acoustic point source. The result is a
loudspeaker with remarkable vocal presence and clarity, a neutral,
balanced sound, high feedback stability and a high sound pressure
level capability. The frequency response covers a 85 Hz to 18 kHz
band - sufficient for speech reinforcment and stage monitor use.
MAX’s angled side panels allow a choice of two set up angles when
placed on stage (35° or 67°). Together with a comprehensive
range of rigging hardware, the MAX cabinet allows fast and easy
deployment, either as stage monitors or front of house in a main
PA system. Viewed from the top, the angle between the MAX side
panels is 45°. MAX cabinets can be deployed side by side to create
semi-circular arrays, two cabinets result in an horizontal dispersion of
100° and three cabinets 145°.
MAX as a stage monitor
(baffle angle 35°)
For applications which require deep bass, the LF response can be
extended by using additional active subwoofer systems C7-SUB or
C4-SUB. MAX can also be combined with the E15-BX passive bass
extension speaker (not recommended when MAX is driven with an
E-PAC).
MAX has been designed to match the dimensions of the C4 system
cabinets. Fitted with optional MAN stud plates, MAX can be flown
beneath a C4 system as downfills. To maintain the correct phase
relationship MAX cabinets are used in passive mode when
combined with C4 systems.
MAX as an array with 100° dispersion
MAX Data Sheet
MAX
Only operate MAX loudspeakers with a d&b P1200A mainframe
fitted with ampMAX or AMP-L controller modules or with an d&b
E-PAC in linear configuration. As an alternative other high quality
power amplifiers may be used, provided their output power does
not exceed 500 watts into 8 ohms and an additional subsonic filter
is used (25 Hz with 12 dB/octave minimum), otherwise there is a
risk of damaging the loudspeaker components.
CAUTION!
Connections
The MAX cabinet is fitted with a pair of Speakon-NL4 connectors.
All four pins of both connectors are wired in parallel. Using one
connector as the input, the second connector allows for direct
connection to additional loudspeakers.
MAX can be supplied with EP-5 output connectors as an option. Pin
equivalents of Speakon-NL4 and EP-5 connectors are listed in the
table on the right.
LF+
LF–
HF+
HF–
n.c.
EP-5
1
2
3
4
5
NL4
1+
1–
2+
2–
n.c.
Four wire and two wire operation
To allow the choice of active or passive operation MAX cabinets
are driven by a four core cable. The HF and LF drivers are each
fed by their own pair of pins and separate passive crossovers. Pins
assignments 1+/1– connect the LF driver, pins 2+/2– connect the
HF driver, as illustrated on the right.
For applications requiring dedicated passive use, the MAX cabinets
internal wiring can be configured for connection to pins 1+/1–
allowing use of a two core cable.
The passive two wire configuration is also used when MAX cabinets
are combined with C-Series active subwoofers. Driven by a
P1200A mainframe fitted with one AMP-L and one C-Series SUB
controller module the cabinets can be fed by a single four core
cable and linked together locally.
To configure the cabinet for twin wire use the connector panel has
to be removed by undoing the four Allen screws with a 2.5 mm
Allen key. The wiring on the back of the connector panel can be
changed to that shown in the lower illustration on the right.
IMPORTANT!
1+
1–
2+
2–
1+
1–
2+
2–
Passive
Crossover
Passive
Crossover
Connector wiring (four wire operation)
In the twin wire/passive configuration both the LF and HF drivers
are connected to pins 1+/1–. Note that only the HF driver wiring
(white and white/red) differs from that used in the four wire
version.
In the twin wire configuration MAX can also be used with amplifiers
from other manufacturers. The amplifier or signal distribution box
needs to have positive signal on pin 1+ and negative signal on pin
1– of it’s speakon output connectors.
MAX internal wiring of the connector panel
to the crossover board in four wire and
two wire operation
MAX
(3.0E)
INPUT A
AMP A
1+
1–
2+
2–
OUT A
INPUT B
AMP B
1+
1–
2+
2–
OUT B
P1200A with ampMAX, passive mode
INPUT A
Active
Crossover
Lo
Hi
INPUT B
AMP A
1+
1–
2+
2–
AMP B
1+
1–
2+
2–
P1200A with ampMAX, active mode
OUT A
OUT B
Operation with P1200A and ampMAX module
ampMAX is a two-channel controller module occupying both slots
of a P1200A mainframe. The combination of P1200A and ampMAX
allows MAX loudspeakers to be driven passively or in 2-way active
mode.
Passive operation
In standard passive mode, ampMAX provides two linear amplifier
channels, each amplifier driving all four pins on the channels
Speakon output connector. Pins 1+ and 2+ carry positive and pins
1– and 2– carry the negative components of the signal. Two MAX
cabinets can be driven by each P1200A amplifier channel.
MAX can also be used with the E15-BX bass extension cabinet. The
E15-BX cabinet is equipped with a passive crossover network and
simply connects in parallel with the MAX cabinet without the need
for any additional control electronics. One MAX and up to two
E15-BX cabinets can be driven by each P1200A output channel.
2-way active operation
The ampMAX module contains a switchable electronic crossover
which routes seperate LF and HF signals to the P1200A amplifier
channels. Pins 1+/1– of both loudspeaker outputs carry the LF
signal, 2+/2– carry HF signal. The output connector pin assignment is
changed automatically when active operation is selected. The input
signal is fed to INPUT A, INPUT B is not used.
A P1200A mainframe can drive two MAX loudspeakers in active mode,
the extra headroom gained serves for the most demanding monitor
applications.
When MAX systems are used as downfills or frontfills for C4
Systems passive operation is recommended. In active mode the
phase response of MAX is not compatible with C4 systems.
ampMAX
2 WAY
ACTIVE
CH A / LOW
CH B / HIGH
CUT
CUT
LFC
LFC
IS/GR
IS/GR
MUTE
MUTE
0
+6
-12
2-WAY ACTIVE switch and indicator
Selecting this switch configures the P1200A for active operation of
MAX cabinets - channel A drives the 15" LF loudspeaker, whilst
channel B drives the 2" HF driver. The yellow LED next to the switch
illuminates to indicate active mode.
The left volume control (CH A / ACTIVE) now controls both channels
and sets the overall level, the right volume control (CH B / HF-LEVEL)
sets the relative HF level.
0
-6
CH A
ACTIV E
ampMAX module switches
-6
+6
-12
CUT switch and indicator
Set to CUT, a high pass filter with a 130 Hz cut-off frequency is
inserted in the controller signal path. The yellow CUT LED
illuminates. MAX is now configured for use with d&b C-Series
active subwoofers. In active mode only the channel A CUT switch is
functional.
CH B
HF-LEVEL
Controls on ampMAX module
MAX Data Sheet
MAX
LFC switch and indicator
When MAX cabinets are used without an active subwoofer
selecting LFC, Low Frequency Compensation, extends the low
frequency response of MAX cabinets down to 65 Hz. The yellow
LFC LED illuminates. In active mode only the channel A LFC switch
is functional.
IS/GR indicators
These indicators give a three stage indication of ampMAX signal
levels.
− 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.
− Gain Reduction (yellow) illuminates when the controller
limiter reduces gain by more than 3 dB.
− Overload (red) illuminates when an 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).
With active mode selected, the channel A indicators show the state
of the LF channel and the channel B indicators show the state of
the HF channel.
10
5
0
-5
-10
-15
-20
-25
-30
20
100
1k
Frequency response of CUT and LFC circuits
Level controls in passive mode
The CH A and CH B detented level controls adjust the controller input sensitivity and have a 20 dB range, -14 dB to +6 dB, calibrated
in 1 dB steps. The level controls are normally set to 0 dB.
Level controls in 2-way active mode
In active mode the CH A / ACTIVE level control adjusts the
controller input sensitivity and has a 20 dB range, –14 db to +6
dB, calibrated in 1 dB steps. The CH B/ HF-LEVEL control adjusts
relative HF level in 0.5 dB steps. For a flat response, whatever the
setting of the CH A / ACTIVE level control, the CH B / HF-LEVEL
control should be set to 0 dB. The more precise 0.5 dB HF level
detent settings invalidate the control scale markings. To account for
the actual 10 dB range of HF level adjustment from –7 dB to +3 dB
divide the control scale setting by two to arrive at the actual value
for relative HF level.
AMP-L
CUT
OVL
ISP
Operation with P1200A and AMP-L module
The AMP-L module occupies a single P1200A module slot and
provides a single linear amplifier channel, which drives the pins
1+/1– of the respective output connector. For operation with the
AMP-L module MAX cabinets have to be configured for two wire
operation (see section "Four wire and two wire operation").
In passive mode up to two MAX loudspeakers can be driven by
each P1200A power amplifier channel. Fitting one AMP-L and one
subwoofer controller module allows a single mainframe to drive
two MAX and two active subwoofer cabinets (C7-SUB or C4-SUB).
All cabinets can be linked together locally and fed by a single fourcore cable from either mainframe output connector.
MAX
(3.0E)
10k
GR
MUTE
0
-6
+6
-12
dB
Controls on AMP-L
module
20k
AMP-L module switches
CUT switch and indicator
Set to CUT, a high pass filter with a 130 Hz cut-off frequency is
inserted in the controller signal path. The yellow CUT LED
illuminates. MAX is now configured for use with d&b C-Series
active subwoofers.
REMOTE
LO IMP
1234
DELAY ON
REMOTE
LO IMP
ON
ON
1 2 3 4 5 6
Operation with E-PAC
To drive MAX cabinets the E-PAC has to be configured to LINEAR
mode.
For an E-PAC version 1 and 2, the configuration is selected by
setting the appropriate DIP switches on the rear panel.
1 2 3 4 5 6 7 8
SPKR
HFA
CUT
E-PAC version 1
For an E-PAC version 3, the configuration is set via a front panel
digital rotary encoder in conjunction with an LCD.
In LINEAR mode all four pins on the Speakon connector are driven
by the E-PAC power amplifier, pins 1+ and 2+ carry positive
signal, 1– and 2– carry negative signal. MAX loudspeakers can be
used in either four wire or two wire configuration.
E-PAC version 2
E-PAC Configuration for LINEAR mode
The E-PAC can drive a single MAX cabinet at an output power of
300 watts. LO IMP mode allows the E-PAC to drive two MAX cabinets
with a 6 dB reduction of input level to the speakers.
The CUT and HFA settings are available on versions 2 and 3. The
characteristics of the CUT setting are explained above under
"AMP-L module switches".
HFA setting
In HFA mode (High Frequency Attenuation), the HF response of the
MAX system is rolled off. The HFA circuit configures MAX to
provide a natural, balanced frequency response when a unit is
placed close to listeners in near field or delay use.
10
5
0
-5
-10
High Frequency Attenuation begins gradually at 1 kHz, dropping
by approximately 3 dB at 10 kHz. This roll-off mimics the decline in
frequency response experienced when listening to a system from a
distance in a typically reverberant room or auditorium.
-15
-20
-25
-30
20
100
1k
10k
20k
Frequency response correction of HFA circuit
(only available with E-PAC version 2)
MAX Data Sheet
MAX
Dispersion characteristics
Due to the conical coverage pattern of the coaxial driver design,
the horizontal and vertical dispersion characteristics of MAX are
largely identical (slight differences which do occur are attributable
to the asymmetric cabinet shape). The diagram below shows
dispersion angle versus frequency plotted using lines of equal
sound pressure (isobars) at -6 dB and -12 dB. The nominal 60°
dispersion angle is maintained from 4 to 10 kHz.
MAX isobar diagram
Frequency response
The graph below shows the different response curves for MAX
driven with the P1200A mainframe with ampMAX. The response in
standard mode is equivalent to the operation with a linear power
amplifier (SPL at a distance of 1 m, output voltage 2.83 V).
110
105
100
LFC
95
CUT
90
85
80
75
70
20
100
1k
10k
20k
MAX frequency response, standard (linear), LFC and CUT switch settings
MAX
(3.0E)
Technical specifications
MAX system data, passive setup
Max. sound pressure (1 m, free field) with P1200A........................................... 133 dB
Max. sound pressure (1 m, free field) with E-PAC ............................................. 131 dB
(SPLmax peak, pink noise test signal with crest factor of 4)
Input level (SPLmax) ................................................................................................. +13 dBu
Input level (100 dB-SPL / 1 m)............................................................................... –17 dBu
Polarity to controller INPUT (XLR pin 2: + / 3: –) ...................................LF: + / HF: –
MAX system data, active setup with ampMAX
Max. sound pressure (1 m, free field).................................................................... 135 dB
(SPLmax peak, pink noise test signal with crest factor of 4)
Input level (SPLmax) ................................................................................................. +15 dBu
Input level (100 dB-SPL / 1 m)............................................................................... –17 dBu
Polarity to controller INPUT (XLR pin 2: + / 3: –) .................................. LF: + / HF: +
MAX loudspeaker
Frequency response (–5 dB, free field) .................................................85 Hz ... 18 kHz
Frequency response (-5 dB, floor coupling) .........................................60 Hz ... 18 kHz
Sensivity (2.83 V / 1 m) ............................................................................................. 100 dB
Nominal impedance ................................................................................................... 8 ohms
Power handling capacity (RMS / peak 10 ms)......................................250 / 1200 W
Nominal dispersion angle ................................................................................. 60° conical
Connections ...............................................................................................2 x Speakon-NL4
.................................................................................................................... (optional 2 x EP-5)
Pin assignments Speakon-NL4.........................................................................HF 2+ / 2–
..................................................................................................................................LF 1+ / 1–
Pin assignments EP-5 ................................................................................................HF 3 / 4
........................................................................................................................................LF 1 / 2
Weight ................................................................................................................. 26 kg (57 lb)
MAX wiring diagram
MAX cabinet dimensions in mm [inch]
MAX Data Sheet
MAX
MAX
(3.0E)
d&b audiotechnik AG, Eugen-Adolff-Str. 134, D-71522 Backnang, Germany, Phone +49-7191-9669-0, Fax +49-7191-95 00 00