G:\_DOKUMENTATIONEN\O 500 C\eng
Digital Studio Monitor
O 500 C
Installation and Operation Manual
058-E0012
Version 021025
K+H Vertriebs- und
Entwicklungsgesellschaft mbH
Auf dem Kessellande 4a • 30900 Wedemark/Germany
Tel: +49 (0) 5130 5848-0
Fax: +49 (0) 5130 5848-11
Email: infoklein-hummel.de
www.klein-hummel.de
www.klein-hummel.com
Fig.1: Front view
Fig. 3: IR Remote control RC-55
Page 2
Fig. 2: Rear view
Contents:
0 Safety instructions...................................................................................................................4
1 Description
1.1 Advantages of digitally controlled monitor systems...............................................................5
1.2 System concept......................................................................................................................6
1.3 Block diagram.........................................................................................................................7
1.4 The modules of the digital controller.......................................................................................9
.
2 Installation / Setup
2.1 Positioning / Mounting .........................................................................................................12
2.2 Connectors and wiring .........................................................................................................14
2.3 VF-display on the front baffle...............................................................................................18
2.4 Recall of the loudspeaker parameter setup.........................................................................18
3 Operation / Description of Menus
3.1 Menu structure and concept of operation............................................................................19
3.2 Main Menu............................................................................................................................21
3.3 System Menu........................................................................................................................23
3.4 EQ Menu...............................................................................................................................24
4 Remote Control
4.1 Infrared remote control.........................................................................................................26
4.2 Control via RS-232 or MIDI..................................................................................................27
5 Room EQ setup
5.1 Room EQ..............................................................................................................................30
5.2 Parametric EQ (PEQ)...........................................................................................................32
.
6 Calculation of parameters ....................................................................................................35
7 Technical data.............................................................................................................36
Page 3
0 Safety Instructions
It is absolutely essential that you read these safety instructions carefully before connecting and
using this K+H product. Your safety depends on it. Furthermore, failure to follow these instructions
voids the warranty. To ensure safe operation for years to come, keep these instructions in a safe place for
future reference. K+H has manufactured this product in accordance with IEC 1992 (SEC) 39 standards, then
tested and delivered it in safe operating condition. To maintain it in this condition, you must:
•
•
•
•
observe all safety instructions,
use the product only as described herein,
have any maintenance, repairs, or modifications performed only by K+H or other authorized personnel,
and
ensure that the room in which you use this product is wired in accordance with the local electrical code.
Warning!
• When the interior of the cabinet is exposed, touching some parts can lead to an electric shock.
• If you need to gain access to the interior electronics of the unit, always disconnect the unit from any and
all power sources first.
• Any repairs, maintenance, or other service of the unit when its interior compartment is
exposed may only be performed safely (in accordance with VBG 4) by authorized
technicians familiar with all the risks involved. Even in an unplugged state, a fully charged
capacitor in the unit can zap the unsuspecting.
• Loudspeaker output jacks labeled with the IEC 417/5036 emblem (Fig. 10, right) may be
carrying dangerously high voltages. If your unit has this emblem, ensure that any
connections to be made between these jacks and the speakers themselves are made
before powering up the unit, and are done so only with manufacturer-approved
Fig. 10
interconnecting cables.
• If you need to replace any fuses, ensure that the replacements are of exactly the same
type, value and voltage as the originals, as spelled out in the technical specifications at
the rear of this manual.
• Do not use "repaired" fuses.
• If you do not have any fuses on hand of the specified size, type, and value, do not hotwire the contacts in the holder by short-circuiting them.
• Certain areas of the cabinet, cover, and rear panel can achieve extreme temperatures
and are therefore marked with a "HOT" label (Fig. 11). Refrain from touching any heat
sink or ventilation grille.
Fig. 11
• High volume levels are known to cause permanent - i.e. irreversible - hearing damage,
especially when listened to without sufficient breaks. The higher the levels, the more frequent and extended must be the breaks. Avoid standing too close to loudspeakers that are being driven at high levels. If
you must be exposed to high sound pressure levels over an extended period of time, use hearing protection.
Mains Connection:
• This unit is designed for continuous operation.
• Ensure that the operating voltage of the unit matches that of the local mains current (AC line voltage).
• Always check before connecting the power cable to the mains socket that the power switch on the unit
itself is set to off ("O").
• Use the power cable or power supply that came with the unit to connect to the mains socket (wall outlet).
• Power supply: a damaged power cable may not be repaired. Use a new cable.
• Avoid plugging the mains cable into a power strip that already has several other power-consuming devices
connected to it.
• Avoid using extension cables. The unit must be connected to a mains socket close to it, and that socket
should be freely accessible.
Installation:
• This product may only be placed on a stable, clean, horizontal surface.
• Do not expose this product to vibration.
• Do not operate this product anywhere near water or other liquids. Do not use it near a sink, swimming
pool, bathtub, or in any damp room or area. Electrical shocks carried through water can kill. Do not place
any beverages whatsoever on or near this product, as liquids can kill electronic components.
• Ensure sufficient ventilation around the product to allow for adequate heat dissipation, especially near
the rear panel and the sides of the cabinet (minimum of 8 inches from the nearest wall). The unit may
only be installed in a rack if measures are taken to ensure sufficient ventilation and if the mounting
instructions of the manufacturer are followed. Do not block or cover any heat sink, fan, or vent.
• Do not place the product where it will be in the path of direct sunlight, and keep it a safe distance away
from radiators and other heaters of any kind.
• If you bring this product from a cold environment into a warm one (such as from a vehicle into a studio),
it is quite possible that condensation will form inside the cabinet. Please allow the unit sufficient time for
acclimatisation to room temperature (minimum thirty minutes) before connecting and powering up.
• To avoid accidents, do not use any accessory equipment with this product which is not approved by the
manufacturer, particularly mounting accessories. Do not place this unit on any unstable platform, cart,
stand or table. Should the unit fall, it can cause bodily injury to persons, or can be damaged itself.
• To protect this product from lightning damage during a thunderstorm or from power surges during an
extended absence, disconnect the power cable from the wall outlet.
Page 4
1.1 Advantages of Digitally Controlled Monitor Systems
- optimizing of frequency responses, e.g. an absolutely linear adjustment from 30 Hz – 20 kHz.
Any other desired frequency curves can be set/adjusted/stored
- setting of phase response(s) in any combination, such as linear-phase, minimum-phase, mixedphase with the resulting group-delays (constant group delay, continiously decreasing, etc.)
- attack and release times of speakers will be remarkably improved
- more precise stereo-locating, as there is virtually no deviation in a stereo pair
- programmed EQ settings can be recalled instantly for special needs and functions
- a nearly unlimited number of EQ-settings can be stored and switched easily, e.g. for different
listening locations in the same room, second control-room, different operating modes (mixing /
demonstration) etc.
- the delay-times of the speakers can be adjusted and stored for different listening distances
- the monitor can be delayed for optimized sync with analog/digital film/video, as a delay-line in
high-quality multi-speaker setups, concerts, multi-media or surround setups
- the slope at the crossover frequencies can be adjusted up to 96 dB per octave, which can be
said is close to ideal (but never possible with analog designs). In this case the overlapping
frequencies reproduced from both drivers in the x-over area is only a few Hz wide, which has the
following advantages:
1. every driver can be used in it’s perfect frequency-response range
2. in the area of the crossover frequency we can avoid phase-cancellations to a large extent
3. it is possible to select a perfect horn for every driver with it’s own directivity (individual
depth of the horns can be adjusted by the system).
ð The directivity can be designed to be almost perfect for the horizontal
and vertical level!
- problems caused by resonances and reflections in control rooms can be minimized and
compensated to a high degree by adjusting the response of the speaker-system in the room.
This will be made in a separate EQ and measuring session in the control-room
- for protection of the drivers fast and efficient limiters are provided which take care of the shortterm max-level and the peak-power capacity of the driver, so in case of a possible overload the
limiters will redurce the levels (feed forward limiter) without producing any distortions, as it is the
case in analog limiters.
- Digital and analog audio input connectors
- Infrared remote-control for all parameters (can be selected individually without any PC)
Page 5
1.2 System Concept
- Active 3-way studio monitor with integrated digital controller and high performance amplifiers
with power amplifiers of 400 W RMS for the woofer, 230 W RMS for midrange driver and 290 W
RMS for the tweeter
Concept of Speakers and Cabinet:
- 12“ woofer with alloy-chassis, forced air cooling voicecoil, high efficiency and long, linear excursion
- 3“ voicecoil midrange dome in sealed enclosure, with strong magnet and lowest distortion
- 1“ titanium dome tweeter with high efficiency and ultra-low distortion
- Cabinet made of strong, resonance free HDF material. It is fitted with a moulded front-baffle with
integrated horns and ducted ports for compression-free low frequency response, and optimized
horns for midrange/tweeter, offering perfect dispersion for all three speakers by minimizing
interferences and reflections
- Cabinet comes with multiple fittings for an individual choice of mounting adaptors
Digital Controller:
- The integrated digital controller includes the electronic crossover, the EQ for every driver-system,
a delay of several milliseconds per chassis, all limiter functions, a master delay, flexible adjustments
for local EQ and a fully parametric 10-band EQ
- Independent adjustments for amplitude and phase are provided for every chassis and for the
complete system by the use of digital FIR filter technology (FIR = Finite Impulse Response)
- Unlike other internal or external digital controllers, the controller of the O 500 C is programmed
with individual filter settings for every driver system which were measured in an anechoic chamber
and set at the factory. All tolerances of the individual drivers, the power amps and the controller
itself are recorded and will be taken into the calculation for the setup / equalizing of every
specific O 500 C monitor system
- Adjustment for positioning in the control room or studio can be made by the fully parametric EQ
with IIR filters directly in the monitor
- Individual FIR filter settings can be made by aligning the O 500 C in it’s final position in the studio
(optional). This way the room specific modes, such as resonances, standing waves etc. can be
compensated
- A precise limiter section will allow for perfect system management by offering a “ look ahead
signal analysis“ of the clipping mode of all power amps, the max. excursion of the drivers and
the long term temperature management and it’s peak allowances
- The important stages in the signal path of the digital controller are calculated accurately with 48
Bit performance
- Stacked A/D converters (gain ranging) in Delta/Sigma technology offer a wide dynamic range on
the input side, by resulting in ultra-low distortion figures at the same time
- High performance quality D/A converters in Delta/Sigma technology in all input/output stages
- High quality concept for the PSU and fully capsuled controller electronics
- Variety of analog and digital audio connections
- Ergonomic and easy operation via infrared remote-control (no PC needed)
Page 6
- Several levels of protection to avoid accidential mis-settings (user security levels)
- Remote control and link functions of the monitors via RS 232 or MIDI
- An output for an additional subwoofer is provided. FIR filtering for this output is provided inside
the O 500 C.
Power amplifier:
- The O 500 C is fitted with high-performance, state-of-the-art power amps, which can deliver
clean 400 W RMS for the woofer, 230 W RMS for the midrange dome and 290 W RMS for the
tweeter.
- Stacked power-supply for better amplifier efficiency
- Very low non linear distortions: woofer< -110 dB, midrange < -100 dB, tweeter < -90 dB
1.3 Block Diagram
In Fig. 1.3/1 all modules which are included in the digital active studio monitor O 500 C can be
seen. All modules shown are integrated in the monitor cabinet:
-
Digital controller
Three power amplifiers
PCB with display, IR-receiver and illuminated logo
PSU with torrodial transformer, PCB and regulators
3 drivers
All audio parameters, except for the power amplifiers, are controlled by the internal DSP. An analog
signal, connected to the O 500 C, will be A/D converted and then fed to the DSP, where all parameters
selected are processed in the digital domain. When the signal has passed all stages in the DSP, it
will be D/A converted and then sent to the analog power amplifiers. The analog output signal to the
external, optional subwoofer can be taken from the transformer-balanced XLR output on the rear
of the monitor. The power amplifiers of the O 500 C have been designed in a bipolar topology and
are built onto one PCB. Heavy-duty alloy heatsinks with a large surface allow for high power
performance under „cool“ conditions.
The digital controller consists of a DSP-PCB, which carries the A/D and D/A converters with the
analog input and output stages, plus the powerful DSP. A further PCB carries the microcomputer
which contains the controller software plus the „core of the system“ the 8 Bit microcontroller.
Both PCB’s are shielded in a MU-metal case to avoid hum and side noises.
The VF display of the digital controller, the limit signalling and the IR receiver are mounted at the
top of the front baffle.
The power supply system has separate voltages for the analog and digital signals, as well as for
the power amplifiers. On the DSP and the microcomputer PCB an additional stabilisation is provided,
again separated for the A/D and the D/A signal paths.
Page 7
Display Board
I / O - Board
Microcomputer Board
Limit
LED
VFL
Display
IR
Decoder
uC
High
Freq.
Driver
RS 232 / MIDI
Mid Freq.
Driver
Analog
Input
A/D
D/A
High
Mid
Digital Input
DSP
D/A
DSP
D/A
Low
Low Freq.
Driver
Sub
D/A
Subwoofer
Output
DSP Board
Power Amplifier Board
Digital Controller
Mains
Socket
Main
Switch
Torroidial
Transformer
Power Supply Board
Speaker Enclosure
Fig. 1.3/1: Block diagram of the O 500 C studio monitor
Page 8
1.4 The Modules of the Digital Controller
This is a brief description of the „modules“ provided inside the O 500 C. Please understand that
these modules are not meant to be physically independent, many of them are part of the integrated
DSP. To keep the description simple and understandable, it is restricted to the modules which are
important for understanding the internal functions in the signal path.
- Analog Input: The input for the analog signals is balanced on studio-level ( + 6 dB ) and can be
selected between electronically balanced or transformer balanced by a switch next to the XLR.
- AD Converter: in this stage of A/D conversion the „gain rangeing“ method was chosen to obtain
the max. possible dynamic in the input stage by using two A/D converters. The first A/D converter
is fed directly from the audio input signal and is set to produce a fixed level of gain, which is then
processed into the second converter. This way a much higher dynamic headroom and gain than
in any other A/D design is obtained.
- Digital Input: The O 500 C has digital inputs following the AES/EBU format, connected to a
transformer-balanced XLR socket, and a S-PDIF format connecting to a BNC socket.
- Input Select: The selection of the input-type is made via the remote control in the main menu,
step INPUT SELECT, here shown as a selector switch.
- Digital Output: The digital output of the O 500 C is in the AES/EBU format connected to an XLR
socket. Factory preset is parallel „input to output“, i.e. a direct link to the output, so the signal can
be fed to the next O 500 C in a stereo setup. In the menu DIGITAL INPUT SELECT you now may
choose the L or R channel from the digital data stream.
.
- EQ Gain: at this stage the digital signal can be reduced or raised by an adjustment of the word
length to match the peaks or dips in the following parametric EQ. The level selected at this point
also remains valid, if the PEQ is in EQ OFF. This way it is possible to make A/B comparisons
without level mismatch.
- 10-Band parametric IIR EQ: the parametric EQ ( PEQ ) of the O 500 C is designed as an IIR
digital filter and contains 10 fully parametric bands with selectable characteristics. By using
these filters it is possible to obtain a system-EQ separately for the LEFT and RIGHT channel.
The full adjustment procedure of the EQ’s is explained in chapter 5.2
- Room IIR EQ: this room EQ is designed to be an IIR filter, just like the PEQ filters. It is designed
for simple compensation of typical room influences and unlinearities. The adjustment is made in
the EQ setting of the EQ menu, as described in chapter 5.1.
- Master Delay: The master delay is the final stage in the signal path, before the signal is devided
by the 4-way electronic crossover. Adjustment is made in the menu „MASTER DELAY“, the
delaytime selected is effecting all four signals. It can be adjusted in meters or seconds.
In the crossover section there are four identical modules from which the user may select the
wanted parameters. As these paths are almost identical, ( the MID, LOW and SUB have additional
downsampling filters to compensate for calculation-speed ) the HIGH signal to describe the functions
is chosen here.
- High (Mid, Low, Sub) Delay: every signal in the 4-way crossover can be delayed individually.
This can be done in the MAIN menu Channel Delay.
- High (Mid, Low, Sub) X-Over + Speaker EQ: Here the bandpass filters were chosen to be FIR
digital filters for every driver. Please note that this feature does not only offer an EQ for the
Page 9
Page 10
electr.
symm.
Input
Select
IIR EQ
Gain
D
A
D
Analog In
(XLR-3)
Input
Transformer
Dual 24 Bit
delta/sigma
AD Converter
A
Analog
input
transf.
coupled
10 Band
Parametric IIR EQ
Room EQ
Master Delay
T
Digital Insert/Trough
(AES/EBU)
Digital In
(AES/EBU)
Digital
- Input (internal Clock)
- Insert (external Clock
Input Level
LED Bargaphs
IIR Section
fs
T
T
Channel Delay
fs/16
Channel Delay
T
Channel Delay
fs/16
Digital In
(S/PDIF)
T
Channel Delay
fs/4
fs
Peak / Thermo
Limiter
Peak / Thermo
Limiter
Peak / Thermo
Limiter
Peak / Thermo
Limiter
A
D
A
A
24 Bit delta/sigma
DA (Dither/N.Sh.)
D
(fs/4)*4
24 Bit delta/sigma
DA (Dither/N.Sh.)
fs
24 Bit delta/sigma
DA (Dither/N.Sh.)
D
A
24 Bit delta/sigma
DA (Dither/N.Sh.)
D
(fs/16)*16
Sub Output
Scaling
(fs/16)*16
Low Output
Scaling
Mid Output
Scaling
High Output
Scaling
Loudspeaker Parameter Setup of O 500 C
1.)
Input Gain
Mute
Analog / Digital Gain Offset
2.)
High (Mid, Low, Sub) Gain
High (Mid, Low, Sub) Mute
X-over + Speaker
FIR-EQ
S ub
X-over + Speaker
FIR-EQ
Low
X-over + Speaker
FIR-EQ
Mid
X-over + Speaker
FIR-EQ
Hi
FIR Section
fs
=
=
Output Relay
System-Abtastfrequenz
verstärkungsbestimmendes
Element
Symmetrical
Output Stage
-
+
Symmetrical
Output Stage
-
+
Symmetrical
Output Stage
-
+
Symmetrical
Output Stage
-
+
Sub Output
(XLR-3)
To Low Power
Amplifier
To Mid Power
Amplifier
To High Power
Amplifier
frequency response, but also for a very complex adjustment of the system, including the phase
adjustments! Furthermore the reaction of the drivers and the electric performance of the amplifier
and the digital controller itself are monitored by the controller.
- Gain: This function adjusts the individual gain in every signal path of the crossover. The values
of possible parameters are influenced by a multitude of menu settings, which can be selected
individually.
- All adjustments (values set) in the menus INPUT GAIN, MUTE ans ANALOG/DIGITAL
Gain Offset will become effective in every signal path of the crossover.
- In the menus HIGH/MID/LOW/SUB GAIN and HIGH/MID/LOW/SUB MUTE it is possible to
select the individual signal path in the crossover, where the parameter adjustments or changing
the gain should become active.
- Peak / RMS / Thermo limiter: The following limiter section contains a PEAK/RMS limiter and a
thermo limiter. They have been designed to avoid the clipping of the power amps, a too high
peak power to the drivers and a limitation of the max. excursion of the voice coils and cones. The
thermo limiter has been added to avoid a thermal overload of the voice coils.
All these parameters are set at the factory and cannot be adjusted by the user. Only the release
time of the peak limiter can be varied by him.
- High (Mid, Low, Sub) Output Scaling: This part of the controller takes a strong influence on the
signal level, finally driving the D/A converter. This function is recalled and reset with every LOAD
memory.
- Balanced Output Stage: The analog output driver of the digital controller of a fully balanced
design. In combination with the balanced input stages a very low influence of noises to the
audiosignal is achieved.
- Analog Subwoofer Output Stage: This analog output from the digital controller is on a balanced
XLR socket for direct connection of an optional active subwoofer.
Page 11
2.1 Positioning / Mounting
The studio monitor O 500 C has been designed
as a Main / Midfield-Monitor, and may be used
as a main monitor in smaller or midsize control
rooms / studios.
The minimum distance to the listening position
should be at least 2,5 meters.
Ways of mounting:
- on a stand with mounting bracket LH35
- on all surfaces with the tilting adaptor LH 36,
in a combination with the TV spigot LH 29, or
the tripod stand adaptor LH 28.
- from the ceiling with mounting bracket LH 35
- For more detailed information on the many
possibilities and adaptors, please see our
studio catalogue SO1, pages 42 and 43
For the best result it should be taken into account
that the main direction of dispersion of the O
500 C corresponds to the axis vertically between
midrange system and tweeter.
When positioning the monitor please make sure
to select the right height for the speaker position,
which can be adjusted / corrected by using the
tilting adaptor LH 36. Fig. 2.1/1 shows the
dimensions and the positioning of the mounting
points on the bottom and the sides.
- free standing on a stand or pedestal
Mounting on a tripod
- flush-mount into a wall
Fig. 2.1/2 shows how the O 500 C is mounted
ANALOG INPUT
DIGITAL S/P-DIF
INPUT
SERIAL PORT
DIGITAL AES/EBU
INPUT
THROUGH
SUBWOOFER
Rear panel may
become too hot
to touch
HOT
Leave enough
space for proper
ventilation
RESET
INPUT
SECTION
PIN 1 =
PIN 2 =
PIN 3 =
electr.
balanced
KLEIN+HUMMEL
RS 232 IN
MIDI IN / MIDI OUT
+
-
transformer
balanced
WARNING!
O 500 C
This equipment
is capable of delivering sound pressure
levels in excess of 90 dB/SPL, which
may cause permanent hearing damage.
PIN 1 =
PIN 2 =
PIN 3 =
Choose electronically
balanced input for
optimized performance
GROUND
CONNECTED LIFTED
POWER
CAUTION!
To prevent the risk of fire and shock hazard don´t expose
this appliance to moisture and rain.
Do not remove rear panel.
Refer to qualified service personnel for service.
No user serviceable parts inside.
CAUTION!
HIGH RESOLUTION MIDFIELD REFERENCE MONITOR
3 AMPLIFIER POWERED SYSTEM
24 BIT, FIR-FILTER-CONTROLLED
MAGNETICALLY SHIELDED
Replace fuse only with same type and rating
MAINS
AC 230 V~
T 3,15 A
AC 117 V~
SB 6,3 A
KLEIN+HUMMEL GmbH D-73760 Ostfildern
MADE IN GERMANY
AC 50 - 60 Hz
Max. power consumption 1500 VA
Fig. 2.1/1: The dimensions of the O 500 C
Page 12
on the tilting adaptor LH36, which is fixed to the
bottom of the cabinet. When adding the TVadaptor LH29 or the tripod stand adaptor LH28,
the monitor can be mounted on a speaker stand.
Alternatively it is possible to use the U-shaped
mounting bracket LH 35, which has its threaded
holes on the side of the cabinet. Here, too, it is
possible to add the LH 29 and LH 28 for mounting
the monitor on a speaker stand. With the LH 35
mounting bracket it is also possible to have the
O 500 C mounted from the ceiling ( may need
additional adaptors, depending on the
construction ).
Horizontal operation
In some cases a vertical operation of the
monitors may not be possible, due to lack of
space or for architectural reasons. For this case
K+H offers a special version for horizontal
operation ( please specify for horn LEFT / horn
RIGHT ) where the horn is rotated by 90
degrees, and special heatsinks are provided to
follow this type of operation. This way the heat
dissipation from the power amps is maintained
optimized. Monitors in this version have to be
ordered specially at the factory, a local
conversion is not possible.
Flush mount into a wall
The O 500 C can also be flush mounted into a
wall or other areas where limited or no airflow
can be provided. For these cases K+H offers a
special wall-mount adaptor kit, which will
accomodate the O 500 C electronics and an
extension cable for the speaker connectors. Now
the electronics can be mounted in an area with
better air circulation. The O 500 C can be ordered
with this option at the factory, but it is also
possible to make a local change after installation
with the wall mount kit.
Fig. 2.1/2: Mounting of the tilting adaptor LH36
Page 13
Fig. 2.1/3: Fixing holes for mounting LH 35 bracket
2.2 Connectors and Wiring
Mains Switch with
Power-ON Lamp
Groundlift-Switch
2.2.1 The connectors on the rear panel
GROUND
All connectors of the O 500 C are located on
the rear panel, placed in two areas. When
installing the monitor under narrow or tight
conditions, care must be taken for the cables
and their minimal bending radius.
CONNECTED LIFTED
POWER
CAUTION!
To prevent the risk of fire and shock hazard don´t expose
this appliance to moisture and rain.
Do not remove rear panel.
Refer to qualified service personnel for service.
No user serviceable parts inside.
CAUTION!
Replace fuse only with same type and rating
MAINS
Mains connector,
Groundlift
Mains
switch,
Fig. 2.2/1 shows the connectors which are
located on the lower part of the monitor.
The connection between the O 500 C and the
mains is made by a standard socket, which also
includes the mains fuse.
Above the power socket is the mains switch with
a built-in controllamp.
The groundlift switch is provided to separate the
Page 14
AC 50 - 60 Hz
AC 230 V~
T 3,15 A
AC 117 V~
SB 6,3 A
Max. power consumption 1500 VA
Fuse Holder
Mains Socked
Adhesive Label with
Serial No.
Fuse SB 6,3 A
Attention!
Replace only with same Type and Rating!
Fig. 2.2/1: The connectors at the lower part of
the rearpanel
internal ground from the mains earth, just in case
there should be any hum problems occuring due
to different potentials between the connected
units.
needed to connect an external PC for
downloading the presets into the O 500 C.
In combination with this, a complete MIDI
interface (In, Out, Through) is provided in this
connector, so that several O 500 C monitors
can be interconnected to eachother.
Chapter 4 shows the complete wiring scheme
of this connector and gives a description of
the connecting cables needed.
Signal connections
The signal connections are located in the centre
of the rear panel, directly under the large
heatsink, please see Fig. 2.2/2 and read the
following description:
Reset:
The RESET key is used to restart the internal
digital controller without switching OFF the
system as it is the case with mains ON / OFF.
Analog Input:
Analog signal sources will be connected to
this XLR socket. Via the selection switch „Input Section“ the input stage of the O 500 C
can be selected for the electronically balanced
format, or a transformer balanced input stage.
Although the transformer is of very high
quality, the position „electronically balanced“
should be preferred for best signal quality.
Only in case of hum problems or special
installations, where transformer isolation is a
must, the transformer balanced position
should be chosen.
Digital S/P-DIF Input:
This BNC socket is connected to incoming SPDIF audio signals. The selection of the signal
source is described in chapter 3.2. When
using this BNC input for digital audio signals,
make sure that no connection is made to the
AES/EBU input!
Digital AES/EBU Input:
Incoming digital signals in the AES/EBU
format are connected to this XLR socket.
When this input is used for digital audio
signals, please make sure that no connection
is made to the BNC socket!
Serial Port:
This connector (SUB-D 25 Pin) has several
functions:
It contains the serial RS-232 ports, which are
Selector for Transformer or Electronic
Symmetric Mode of Analog Input
Input for Digital
AES/EBU Sources
Interface
(RS-232, MIDI, Memory Modul)
Input for Analog
Sources
Input for Digital
S/PDIF Sources
Output for Digital
AES/EBU Signals
Digital Controller
Reset Button
ANALOG INPUT
SERIAL PORT
DIGITAL S/P-DIF
INPUT
Analog Output for
Optional Subwoofer
DIGITAL AES/EBU
INPUT
THROUGH
SUBWOOFER
RESET
INPUT
SECTION
PIN 1 =
PIN 2 =
PIN 3 =
electr.
balanced
RS 232 IN
MIDI IN / MIDI OUT
+
-
transformer
balanced
Choose electronically
balanced input for
optimized performance
PIN 1 =
PIN 2 =
PIN 3 =
Fig. 2.2/2: The signal connectors in the middle of the rear panel of O 500 C
Page 15
Digital AES/EBU through:
This XLR socket will carry a parallel digital
output signal, which is fed either to the BNC
or XLR digital input. There will be a format
conversion inside the O 500 C, so any S-PDIF
signal in the BNC input will be an AES/EBU
signal on that XLR output. This signal may
now be fed to a second O 500 C and the user
may select for the L or R channel from the
digital data stream.
Subwoofer:
This XLR output will carry the analog output
signal from the digital controller, which is
provided for an external, optional subwoofer.
This output will only be active, if a special 4way setup has been loaded for the O 500 C.
Examples for connections
In Fig.s 2.2/6 to 2.2/9 are some examples how
to connect the O 500 C to various signal
sources.
2.2.2 Variety of Connections
Cables
The figures 2.2/3 to 2.2/5 show the pinning of
the cables which are used in the variety of
connections, described in the following
passages:
Fig. 2.2/3 shows all balanced connections,
such as to a studio console with balanced
outputs, also for the digital AES/EBU
connections. When using AES/EBUconnections, please make sure that your cable
has a characteristic impedance of 110 Ohms.
Do not use ordinary XLR cables as normally
used for microphones or Line-levels!
To connect the O 500 C to analog sources
from consumer / HiFi units, an adaptor cable
as per Fig. 2.2/4 should be used. Although
XLR-3 female
2
Cinch
XLR-3 male
2
1
3
Break Bridge in Case of Humm & Buzz Problems!
Fig. 2.2/4: Adapter from cinch to XLR
XLR-3 male
2
Cinch
1
BNC Jack
1
3
Fig. 2.2/3: XLR standard cable
Page 16
most of these units do not have a mains earth
connection (Euro mainsplug) the receivers,
tuners or TV-systems often are connected to
antennas, which are normally grounded. In
this case the groundlift should be switched to
ON and the O 500 C input should be selected
for „transformer balanced input“. If the hum
problem still remains, PIN 3 on the XLR plug
should be disconnected (cut), and the
shielding wire on the cinch plug should not
be connected.
Connecting the O 500 C to a consumer / HiFi
unit with a digital S-PDIF output, a connection
cable as seen in Fig. 2.2/5 is needed, in case
there is no BNC output on that unit.
3
Fig. 2.2/5: Adapter from cinch to BNC
ANALOG INPUT
SERIAL PORT
DIGITAL S/P-DIF
INPUT
DIGITAL AES/EBU
INPUT
THROUGH
Subwoofer (optional)
SUBWOOFER
RESET
Left
unbalanced
Output
INPUT
SECTION
PIN 1 =
PIN 2 =
PIN 3 =
electr.
balanced
RS 232 IN
MIDI IN / MIDI OUT
+
-
transformer
balanced
Analog
Input
PIN 1 =
PIN 2 =
PIN 3 =
Choose electronically
balanced input for
optimized performance
Left
Output
Analog Pro/
Consumer
Equipment
(Mixer,
Preamp,
CD Player,
...)
Fig. 2.2/6: Operation of the O 500 C and an optional subwoofer from an analog signal source. For
a balanced connection in a studio-system please use a standard XLR-cable. If the O 500 C is
connected to an unbalanced signal source, please make sure to use a proper adaptor cable as per
Fig. 2.2/4, or have it wired up that way.
AES/EBU
Output
To Optional
Subwoofer
To Optional
Subwoofer
Digital Pro
Equipment
ANALOG INPUT
SERIAL PORT
(Mixer,
Preamp,
...)
DIGITAL S/P-DIF
INPUT
DIGITAL AES/EBU
INPUT
THROUGH
ANALOG INPUT
SUBWOOFER
SERIAL PORT
RESET
INPUT
SECTION
PIN 1 =
PIN 2 =
PIN 3 =
electr.
balanced
INPUT
SECTION
RS 232 IN
MIDI IN / MIDI OUT
+
-
transformer
balanced
DIGITAL S/P-DIF
INPUT
DIGITAL AES/EBU
INPUT
THROUGH
SUBWOOFER
RESET
PIN 1 =
PIN 2 =
PIN 3 =
Choose electronically
balanced input for
optimized performance
PIN 1 =
PIN 2 =
PIN 3 =
electr.
balanced
RS 232 IN
MIDI IN / MIDI OUT
+
-
transformer
balanced
PIN 1 =
PIN 2 =
PIN 3 =
Choose electronically
balanced input for
optimized performance
Fig. 2.2/7: The O 500 C connected to a signal source with a digital AES/EBU output. The L or R
channel can be selected separately for every monitor from the digital data stream. Please refer to
„Digital Input Select“ in chapter 3.2
S/PDIF
Output
To Optional
Subwoofer
Digital
Consumer
Equipment
ANALOG INPUT
SERIAL PORT
(Mixer,
Preamp,
...)
DIGITAL S/P-DIF
INPUT
DIGITAL AES/EBU
INPUT
THROUGH
To Optional
Subwoofer
ANALOG INPUT
SUBWOOFER
SERIAL PORT
RESET
INPUT
SECTION
Alternative Wiring Option
PIN 1 =
PIN 2 =
PIN 3 =
electr.
balanced
INPUT
SECTION
RS 232 IN
MIDI IN / MIDI OUT
+
-
transformer
balanced
DIGITAL S/P-DIF
INPUT
DIGITAL AES/EBU
INPUT
THROUGH
PIN 1 =
PIN 2 =
PIN 3 =
Choose electronically
balanced input for
optimized performance
PIN 1 =
PIN 2 =
PIN 3 =
electr.
balanced
RS 232 IN
MIDI IN / MIDI OUT
+
-
transformer
balanced
PIN 1 =
PIN 2 =
PIN 3 =
Choose electronically
balanced input for
optimized performance
To Optional
Subwoofer
ANALOG INPUT
SERIAL PORT
DIGITAL S/P-DIF
INPUT
DIGITAL AES/EBU
INPUT
THROUGH
To Optional
Subwoofer
ANALOG INPUT
SUBWOOFER
SERIAL PORT
RESET
INPUT
SECTION
PIN 1 =
PIN 2 =
PIN 3 =
electr.
balanced
-
transformer
balanced
INPUT
SECTION
Choose electronically
balanced input for
optimized performance
DIGITAL S/P-DIF
INPUT
DIGITAL AES/EBU
INPUT
THROUGH
SUBWOOFER
RESET
RS 232 IN
MIDI IN / MIDI OUT
+
SUBWOOFER
RESET
PIN 1 =
PIN 2 =
PIN 3 =
PIN 1 =
PIN 2 =
PIN 3 =
electr.
balanced
RS 232 IN
MIDI IN / MIDI OUT
+
-
transformer
balanced
Choose electronically
balanced input for
optimized performance
PIN 1 =
PIN 2 =
PIN 3 =
Fig. 2.2/8: Connection of the O 500 C to a source with digital S/PDIF output. To connect a second
O 500 C in the signal chain, either a T-adaptor for the BNC input can be used, or the signal to the
second monitor can be taken from the digital output XLR socket. Please note, that this output is
AES/EBU! The selection for either L or R signal from the digital data stream ist the same as before.
Page 17
2.3 VF-Display on the Front Baffle
VF-display 2 x 24 digits
K+H logo with
illumination
LED „Limiter active“
Infrared receiver
KLEIN + HUMMEL
O 500 C
LIMIT
Fig. 2.3/1: The indicators of the O 500 C
The display on the front baffle is covered with a
tinted plexiglass panel. This panel is right above
the HF driver. Fig. 2.3/1. shows the functions from
left to right:
- Illuminated K + H Logo as a standby indicator:
it will only light up, when the digital controller
has booted correctly. This light may be shut
off, see chapter 3.3
- Vacuumflourescent display (blue) with 2x24
digits, can be adjusted in brightness (see
chapter 3.3)
- Infrared receiver for the IR remote control,
which is part of the system
- Indicator „LIMIT“, which will light up when one
or more limiters of the system become active
2.4 Recall of the Loudspeaker Parameter Setup
The O 500 C is supplied with factory presets of
all loudspeaker-relevant parameters like speaker
equalization, limiter settings,... which are stored
in a Flash-ROM of the digital controller. Additional parameter presets can be ordered at extra
charge, or can be determined on the installationsite of the monitors and copied into the FlashROM (Room eqalization).
During the first installation of the monitor it has
to be checked, whether the right preset has been
activated. If not, the correct Loudspeaker Parameter Setup has to be looked up and recalled
into the system.
The O 500 C is operated by the IR-remote
controller RC 55.
The procedure is as follows:
- Switch ON the monitor with the power switch
on the rear panel
- Wait until the digital controller has booted and
the K + H Logo is illuminated
- The menu „Input Gain“ appears in the display,
showing a default dB-value
- By pressing the numeric key „8“ on the RC
55 the menu step 8 Speaker Select will
become active, the display will now show
„Monitor/Subwoofer“.
Page 18
Note: If this menu step doesn’t appear, the user
security level has to be changed, see chapter
3.3, step 3.
- The blinking cursor now can be moved into
the LEFT area of the display ( by pressing the
LEFT cursor button of the RC 55 ) into the
position of „M“ for Monitor.
- By pressing the +/- buttons on the RC 55 the
correct „Monitor“ name is selected and stored
by pressing ENTER Key
- The flashing dot in the centre of the display
asks for confirming this choice. Once done, it
will permanently be illuminated.
- By pressing the RIGHT arrow key the cursor
is changing into the RIGHT half of the display
to the position of „S“ for subwoofer,
adjustments are made in the same sequence
as above
- By pressing the numeric key „3“ on the remote
control the system changes to the „Input Gain“
menu.
- By pressing the +/- keys the desired signal
level can be adjusted
- The O 500 C now is ready to work, and even
after switching OFF/ON all parameters that
were set prior to switch-OFF are active again.
3.1 Menu Structure and Concept
of Operation
The operation of the O 500 C digital controller is
based on a special menu structure, where the
individual menu steps have been concentrated
into three main menus:
- Main Menu (Chapter 3.2): This menu
includes the most needed control functions
for the normal operation of the monitor, such
as the level setting for the input signals, setting
and recall of setups, adjustement of internal
delay and finally the choice of the desired
Loudspeaker parameter setups which are
stored in the Flash-ROM.
- System Menu (Chapter 3.3): This menu
contains the basic settings of software and
hardware, which are used occasionally, such
as configuration of the MIDI channel,
passwords for the user levels etc.
- EQ Menu (Chapter 3.4): This menu is
completely reserved for the setups and
adjustments of the integrated Room- and
parametric EQs, where changes in the overall
frequency response can be made, such as
the line-up procedure for adjustments in the
control room.
Recall and adjustments of the individual menus
will be made via the IR-remote control unit RC
55, see chapter 4.1.
- Menu selection keys: Sys - Main - EQ for
selection of the menu
- four ARROW keys: UP - DOWN - LEFT RIGHT for navigation through the individual
points within a menu
- the two +/- increment keys located under the
L/R arrow keys will be used for adjusting the
parameters of the selected functions
- The ENTER key in the centre of the arrowkeys
The other keys of the IR remote control will be
explained in chapter 4.1 .
When selecting any of the menu sections the
system will show the headline of the relevant
menu. When pressing the MAIN key for example
the „K + H O 500 C Main Menu“ headline will
appear in the VF-display of the O 500 C.
From this headline all visible ( activated for the
user ) menupoints can be recalled by pressing
the DOWN arrow-key. to get back to the
headline, simply press the UP arrow key.
When a menu point has been activated, the
name of the menu will appear in the left part of
Fig. 3.1/1:
Menu step 4 (Input Gain)
of the main menu
the upper line of the VF-display:
When pressing the +/- increment keys, the
parameters marked by the blinking cursor can
be modified. Here it is either possible to modify
the value of a numerical parameter, or to step
through a list of options. Illus. 3.1/1 shows the
position of the blinking cursor ready to modify
the „Input Gain“ which can be changed by
pressing the +/- incrementkeys.
In some menus the actual changes do not
become valid immediately. To avoid accidential
modifications the system will wait for an ENTER
command by pressing the ENTER key after that
modification. Now the setting is stored by the
system and becomes active.
An illuminated dot in the upper centre of the VFdisplay is signalling the following conditions:
A flashing dot signalls waiting for confirming a
settng. When this is done by pressing the
ENTER key, the dot will be ON permanently.
Note:
After a parameter has been changed without
being confirmed by pressing ENTER the
changes will not become active and the original
setting will remain.
In some of the menus it is possible to modify
several parameters. In these cases all
parameters are shown on the VF-display next
to each other and can be selected by moving
Page 19
the blinking cursor with the LEFT and RIGHT
arrow key.
There are some menus which offer a larger
number of parameters which would not fit onto
the VF-display. In these cases the menu is
spread onto several subpages.
The menu points with a subpage are marked
with an arrow in the upper right corner of the
display, if there are more than one pages there
will be a double arrow shown.
To get to the next subpage the cursor can be
moved by the LEFT or RIGHT cursor key, which
then will be displayed.
Examples for the splitting of one menu point into
several subpages can be seen in points 10...13
of the main menu.
This general description of the operation is valid
for all menus.
Remarks:
The listing in the following chapters
contains all menu points of the O 500 C
software. The selected user security level
affects the relevant menus, which can be
displayed and modified (see system menu
chapter 3.3, step 3). These are marked with
an “X” in the following overwiews.
Page 20
3.2 Main Menu
(Eprom-Version-Nr. KH 1.038)
K+H O 500 C
Main Menu
0
No. / Name of Menu Step
Options
Units
Default Settings
-----83...0...+45 dB
-30...30 dB
-30...30 dB
---40...0 dB
--------0...999 ms
0...339,9 m
0...5759 us
---18...6 dB
--0...92,1 ms
--10...250 dB/s
-----
000 Default Setup
Default Setup / 000
-25
0
-13
off
-20
Analog
left
----0
0
0
no
0.0
no
0.0
Low+Mid+Hi
250
--off
0
1
2
3
Load Setup
Save Setup
Input Gain
4
Gain Offset
5
Mute
6
7
Input Select
Digital Input Select
8
Speaker Select (Matrix)
9
Master Delay
10
11
12
13
14
15
Delay Offset
Channel Mute
Channel Gain
Channel Phase Invert
Channel Delay
Delay Link
16 Limiter
17 PWR Amp -10dB
No. / Name
Enter Setup Name / Enter Setup No.
Gain [dB]
Analog [+/- dB]
Digital [+/- dB]
Mute on / Mute off
Mute Attenuation [-dB]
Analog / Digital
left / right / left+right
Monitor
Subwoofer
Delay Time [ms]
Distance [m]
--High, Mid, Low, Sub [yes/no]
High, Mid, Low, Sub [dB]
High, Mid, Low, Sub [yes/no]
High, Mid, Low, Sub [ms]
off / Mid+Hi / Low+Mid+Hi
Lim. Release [dB/s]
Display Test (via Enter)
on / off
1
X
User Security Levels
2
3
4
X
X
X
X
X
X
X
5
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Explanation of Menu Steps:
K+H O 500 C
- Main Menu (Menu headline)
1 Load Setup
In this menu the setups can be recalled. A
setup contains all settings in all menu steps
of the main and EQ menu, with the exception
of the menu step 3 Input Gain. It also contains
the status of the logo illumination (ON/OFF,
see system menu). By pressing the +/increment keys it is possible to scroll through
the options, until the name of the desired
setup is displayed, which now can be recalled
by pressing ENTER.
2 Store Setup
To store modified settings of the main menu
and EQ menu in a new SETUP, select Enter
Setup Name by pressing the ENTER key.
Now it is possible to select a character A, a,
O with the DOWN arrow key and then select
the desired characters or numbers by
pressing the +/- increment keys. With the
LEFT / RIGHT - arrow keys the cursor can
be moved between the individual letters of
the word. After entering the desired name the
number of the setup is selected by the
increment key in the menu Enter Setup No. .
Finally press the ENTER key to store the
modifications. The setup can be recalled
under 1 Load Setup, as described above. The
menu point Input Gain is not included in the
settings of a setup, so the actual listening level
remains constant when selecting a new one,
or toggeling between two setups. If setups
with different levels are wanted, these can be
adjusted and stored in the menu Gain Offset
individually for the analog and digital signal
input.
Note: the menu point STORE SETUP can be
left at any time by pressing the SYSTEM
MENU key.
Important note: All setups and the current
adjustments of all menu points will be stored
in the SRAM of the digital controller. When
the monitor is switched OFF, the SRAM will
be powered by the internal buffer battery. This
lithium battery has a life of several years and
should only be replaced by skilled engineers
according to the factory recommendations!
3 Input Gain
In this menu the anaolog and/or digital input
level will be changed. When the O 500 C is
switched ON, this level will be automatically
recalled.
4 Gain Offset
In this menu it is possible to store different
input levels for the analog and digital inputs.
Looking at the signal flow of the unit, it can
Page 21
be seen that this level setting is done at the
same location as the Input Gain.
5 Mute
When MUTE is activated, the level will be
reduced by the value preselected in the Mute
Attenuation menu.
6 Input Select
In this menu the analog or digital input is
activated. When selecting digital, the 500 C
will be triggered by the signal source, the
internal clock generator is deactivated.
7 Digital Input Select
In this menu the L or R channel may be
selected from the digital datastream. In a normal stereo-setup the LEFT monitor will have
the selection LEFT and the RIGHT monitor
will be selected for RIGHT.
In the setting „LEFT + RIGHT“ the system
will generate and reproduce a mono sum of
both channels.
8 Speaker Select
In this menu the loudspeaker parameter setup
will be recalled. At „Monitor“ and „Subwoofer“
the desired presets can be selected by
pressing the +/- increment keys, followed by
ENTER to load the settings. A signal beep
will confirm this selection, which also can be
made during reproduction of a signal. If the
selected loudspeaker parameter setup can
not be recalled, the system will respond with
the notice: „not available“ after pressing the
ENTER key. The parameters previously set
will remain active in this case.
9 Master Delay
In this menu the signal fed through the O 500
C can be delayed either in milliseconds or
meters. The shortest delaytime is determined
by the basic delay time of the digital controller
which depends on the selected loudspeaker
parameter setup. Based on that basic time
the delaytime may be varied by max. 999 mS,
which is equal to 339,90 meters.
10 Delay Offset
This menu adjusts the overall delay of the
monitor in very small steps. It will adjust the
basic delaytime of the monitor in a
multichannel setup.
Page 22
11 Channel Mute
In this menu step each signal path (High, Mid,
Low and the optional subwoofer) can be
muted. Changing the status (Mute on/off) is
made by the +/- increment keys of the remote
control.
12 Channel Gain
This menu adjusts the gain of every path by
max. +6/-18 dB. Regarding the selection of
the channel, the same options are provided
as described above.
13 Channel Phase Invert
In this menu the pase of everey signal path
can be inverted by 180°. Here the same
options for adjustments are provided as in
the previous menus.
14 Channel Delay
This menu adjusts an individual delay time
for every signal path after the electronic
crossover, for example the compensation for
different delay times between the O 500 C
and an optional subwoofer.
15 Delay Link
In this menu the individual signal paths for
the adjustments as described in the Channel
Delay menu can be combined for ease of
operation, i.e. adjusting all three signals at
the same time.
16 Limiter
This menu allows for a change of the releasetime constant of the internal peaklimiter which
prevents the system from clipping of the
power amps and from too long excursions of
the cones. The desired value is selected by
pressing the +/- increment keys.
17 PWR Amp -10 dB
When selecting the option „ON“ the gain of
the O 500 C power amps is reduced by 10
dB. When operating the system at low
listening levels this option should be selected
to increase the word length of the digital signal
given to the digital controller’s DACs.
3.3 System Menu
(Eprom-Version-Nr. KH 1.038)
K+H O 500 C
System Menu
0
No. / Name of Menu Step
Options
Units
Default Settings
0
1
Brightness
2
Midi Settings
3
Security Level / Password
4
5
6
Change Password
IR Control
AES Stat./ Sample Rate
7
Version No. (Betriebssystem)
8 Service Section
9 Version No. (Eprom)
10 Logo
Display [%]
Channel
out [out only / out-trough / loop]
Baudrate [Midi / RS232]
ParaChg [on / off]
TX-Chn
Midi-Monitor [start]
Load Level Nr.
Passwort
(Name)
[on / off]
S.Rate [kHz]
Reeboot
Initialize
Check LED Bargraph
--on / off
25,50,100 %
1...16
--31250 / 9600
--1...16, OCM
--0...5
-------------------
100
1
out only
RS-232 (9600)
off
1
--5
locked
0000
on
--------App V KH 1.0XX
on
1
User Security Levels
2
3
4
X
X
X
5
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Description of the Menu Steps:
K+H O 500 C
- System Menu Menu headline
1 Brightness
Here the brightness of the VF display can be
adjusted. The selection of the steps can be
made by pressing the +/- increment keys.
The new setting is activated by pressing
ENTER.
2 MIDI Settings
In this menu the internal MIDI/RS-232 –
interfaces are determined. The individual
options are spread across several menusubpages, which are selected by the LEFT /
RIGHT - arrow keys. For more details see
chapter 4.2.
3 Security Level / Password
In this menu step it is possible to select 6 different user security levels (0...5) for operating
the O 500 C. By hiding menupoints it is
possible to make adjustments and operation
of the O 500 C accessible to differnt groups
of users with different background /
knowledge, to avoid misuse. Apart from this
it is possible to make the everyday use much
easier, because for this purpose all rarely
needed adjustments are not accessible in
normal operation, so it will be less confusing
and the „toy effect“ is kept low.
The security levels can be recalled with the
numbers 0 to 5 after the correct password
has been entered. First, the cursor has to be
moved to the right side of the display. After
pressing ENTER, the correct password
positions can be reached by pressing the
LEFT / RIGHT arrow keys, and the correct
characters are selected by pressing the +/increment keys. After pressing ENTER, the
writing „unlocked“ appears, if the password
was correct. After moving the cursor to the
left display side at Security Level Nr. the
number of the desired security level is entered
by the +/- increment keys. By pressing the
ENTER key the level is changed and locked
again.
4 Change of Password
This menu changes the name of the
password of the digital controller. First, the
active password has to be entered as
described above and to be confirmed by
pressing ENTER. Now the display will show
„unlocked“ and with the DOWN arrow key the
CHANGE PASSWORD page will be opened.
After pressing ENTER the display will show
the actual password, which now can be
changed / modified by pressing the LEFT /
RIGHT arrow keys and the +/- increment
keys. When ready, the new password should
be noted and confirmed by pressing ENTER.
Important note: If the password can not be
remembered it will not be possible to find it
on site. In this case it is recommended to
initialize the O 500 C by activating the menu
Page 23
Version No. in the Sys-Menu or by holding
down the ENTER key when switching ON the
monitor. Now the password is set to the
default value 0000. Attention: This reset also
affects all the adjustments in the menus which
have been made by the user, only the
loudspeaker parameter setups which are
stored in the Flash Rom will remain. (please
see the menu „Default adjustments“).
When activating the option Reboot via the
ENTER key, the digital controller will boot like
it does if you power-up the O 500 C. All
settings and presets in the individual menus
remain active. When the option Initialize is
selected, all individual settings in all menus
will be erased and the system will only work
with the default settings of the factory presets.
When pressing the ENTER key an additional
confirmation is necessary by pressing the
Main key. Otherwise, it is possible to turn back
by pressing the SYS key.
5 IR Control
In this menu the IR remote control can be
switched ON / OFF.
6 AES Stat. / Sample Rate
In this menu the clock frequency is shown,
which the O 500 C is locked to. In normal
mode, this will be 44,1 kHz for S-PDIF or 48
kHz for AES/EBU format. This is a straight
status display, just for user information, and
non-adjustable.
7 Version No. (Operating System)
In this menu the release number of the
operating system of the digital controller will
be displayed. In case of service this number
may be needed for reference or updates.
8 Service Section
This menu has no function in the O 500 C.
9 Version No. (Eprom)
In this menu the number of the DSP software
version will be displayed, which is stored in
the internal E-PROM.
10 Logo
In this menu it is possible to switch OFF the
illuminated K+H logo, which is located on the
left of the VF display. This selection is stored
in the main setup, too. (see Chapter 3.2, step
1)
3.4 EQ – Menu
(Eprom-Version-No. KH 1.038)
K+H O 500 C
EQ Menu
0
No. / Name of Menu Step
Options
Units
Default Settings
0
1
EQ Set
2
EQ
3
EQ 1
...
...
12 EQ 10
13 Load EQ Setup
14 Save EQ Setup
Low Cut [Hz]
Bass EQ [dB]
Mid EQ [dB]
High EQ [dB]
Gain [dB]
EQ [on / off]
Type [HS12, HS6, LS12, LS6, Peak,
HP12, HP6, LP12, LP6]
Güte
Frequenz [Hz]
Gain [dB]
No. / Name
Enter Setup Name / Enter Setup No.
30...80 [10] Hz
-10...0 [2] dB
-5...0 (1) dB
-4...1 (1) dB
-24...0 dB
----0,1...6355
---99...12 dB
-----
1
User Security Levels
2
3
4
5
X
X
X
X
30
0
0
0
-3
on
Peak
2
(misc.)
0.0
000 Default Setup
Default Setup / 000
X
X
X
X
Description of the menu steps:
K+H O 500 C
- EQ Menu Menu headline
1 EQ Set (Room EQ section)
In this menu step the adjustments for a room
equalisation can be done easily. The settings
Page 24
are made by pressing the +/- increment keys
on the remote control, the changes are done
imediately without confirming with ENTER.
By pressing the LEFT / RIGHT arrow keys
the cursor can be moved between the four
possible options of this menu ( for futher
explanations see chapter 5.1).
2 Gain / EQ
The gain reduction to be made in this menu
is calculated upon the max. gain increase
made in any frequency band which has been
adjusted in the menu EQ Set or EQ1...EQ10.
By compensation of the signal gain at this
stage it is possible to avoid any overload in
the following signal stages. By selecting EQ
OFF all adjusted EQ settings in the EQ 1 ...EQ
10 presets will be taken out of the signal flow.
The adjustments made in EQ Gain are not
bypassed, i.e. the preselected value remains
active.
3 EQ1...12 EQ10 (PEQ section)
Each of these 10 menu steps provides a fully
parameteric EQ band. The type of every band
can be selected to be peak, shelving or low/
highpass characteristics by moving the cursor
to PEAK and then stepping throufg the options
by pressing the LEFT / RIGHT arrow keys. A
setting is confirmed by pressing the ENTER
key. In PEAK mode the following options are
accessible: Q-factor, frequency and +/- gain
in the mid band frequency. When selecting a
shelving filter the -3 dB frequency and gain
can be adjusted. All of these settings are done
by moving the cursor to the desired position
and then changing the values by using the +/
- inkrement keys. The settings are confirmed
without using ENTER. For further
explanations see chapter 5.2.
13 Load EQ Setup
In this menu it is possible to store EQ setups.
An EQ setup contains all adjustments of the
menus 3 EQ1 ... 12 EQ10. To recall them,
simply press the +/- increment keys until the
name of the desired setup appears in the
display. By pressing ENTER this preset will
be instantly recalled.
14 Store EQ Setup
To store modified settings of the EQ bands
1...10 (PEQ section) in a new SETUP, select
Enter Setup Name by pressing the ENTER
key. Now it is possible to select a character
A, a, O with the DOWN arrow key and then
select the desired characters or numbers by
pressing the +/- increment keys. With the
LEFT / RIGHT - arrow keys the cursor can
be moved between the individual letters of
the word. After entering the desired name it
has to be confirmed with ENTER. After that
the number of the setup is selected by the
increment key in the following menu Enter
Setup No. . Finally press the ENTER again
key to store the modifications. The setup can
be recalled under 1 Load EQ Setup, as
described above.
Note: the menu point STORE SETUP can
be left at any time by pressing the SYSTEM
MENU key.
Important note: All setups and the current
adjustments of all menu points will be stored
in the SRAM of the digital controller. When
the monitor is switched OFF, the SRAM will
be powered by the internal buffer battery.
This lithium battery has a life of several years
and should only be replaced by skilled
engineers according to the factory
recommendations!
Page 25
4.1 Infrared Remote Control
The IR remote control RC 55 is supplied with
every O 500 C monitor. Even when ordering a
pair or a 5.1 system, every O 500 C will have it’s
own remote control. All RC 55 are identical, it is
just a matter of providing the user with a spare
RC of the same type. The RC 55 remote control
has 36 rubber keys, which are operating all
functions of the O 500 C. In addition to the
standard controls such as menu select, cursor
keys and increment keys which have been
described before, a number of DIRECT ACCESS
keys are provided for controlling important
functions of the O 500 C.
Fig. 4.1/1 shows the layout of the keys. The
silkscreening / naming of every key will explain
the individual keys:
Numeric keys
With the number keys (1 ... 0, *, #) the menusteps of the selected menu (Main, Sys, EQ)
can be recalled directly by typing in the related
menu number (can be looked up from the
selection in chapter 3).
Please note that only the visible menupoints
of the activated user security level can be
recalled!
Setup-Keys
These keys can be used to recall the main
setups 1...4 which have been stored in menu
step 2 of the Main menu (see chapter 3.2)
-20 dB
This key will select the function 17 PWR Amp
-10 dB as described in chapter 3.2 and will
lower the listening level by 10 dB. Pressing
again will return to the original volume.
Mute
When pressing MUTE, the function described
in 4 Mute of the main menu will reduce the
signal level by the value as adjusted in the
„Mute Attenuation“ menu.
Vol+/VolWith these keys the level of the monitor can
be adjusted. Pressing any of these two keys
will atomatically activate the menu Input Gain
of the main menu. Any changes of the settings
in this menu do not need to be confirmed by
pressing ENTER.
1
2
3
IR on/off
4
5
6
RoomEQ
7
8
9
EQ on/off
0
#
Main
EQ
Sys
Mute
IR ON/OFF
This direct access key will allow for the ON /
OFF switching of the IR remote control.
Room EQ
When pressing this key, the menu step 1 EQ
Set of the EQ-menu becomes active to adjust
the room EQ (see chapter 5.1) of the O 500
C.
EQ ON/OFF
When pressing this key, menu 2 EQ of the
EQ-menu is activated and the EQ is switched
ON / OFF.
Page 26
-20 dB
Enter
-
Vol +
+
Vol -
Setup 1 Setup 2 Setup 3 Setup 4
KLEIN+HUMMEL
Fig. 4.1/1:
The labelling of the IR- remote
control RC 55
4.2 Control via RS-232 or MIDI
4.2.1 Wiring of the interface socket
The Sub-D socket on the rear of the O 500 C
contains several interfaces of the internal digital controller:
- MIDI-Interface with MIDI In, MIDI Out and
MIDI Through
- RS-232 interface
- Interface for future options
Fig. 4.2/1 shows the actual wiring and pinning
of the 25-pole SUB-D connector.
Please take care to provide individual groundconnections for every mode, see Fig. 4.2/1
The MIDI-interface will allow for a simultaneous
controlling of several O 500 C, so one adjustment
in a monitor will be routed to the other systems
as well.
If, for example, two O 500 C are linked together,
the MIDI OUT socket of one monitor is
connected to the MIDI IN socket of the next
monitor, the distance between two boxes may
be up to 15 meters.
In menu 2 Midi Settings of the System-Menu
the following default adjustments have to be
selected:
Menu: 2 Midi Settings:
Baudrate = MIDI
To make the MIDI interface accessible with the
standard 5-pole DIN connectors, an adaptor has
to be made up (or bought in computer shops)
wired up according to Fig. 4.2/2.
(10) GND
ParaChg = ON
To select one monitor as the MASTER and the
other one ( ones ) to be the receiving SLAVE,
the slave monitors are selected for „ParaChg“
to OFF. Alternatively the adaptor shown in Fig.
4.2/3 may be used for the interconnection of the
two systems.
(7) RS-232 GND
25 Pin SUB-D MALE
(11) +5 V Out
(3) RS-232 TX
(12) EE-Clk
1
13
(2) RS-232 RX
25
(13) EE-Data
14
(1) Chassis GND
1
13
25
14
(17) MIDI Through +
(25) MIDI GND
(18) MIDI Through (24) MIDI Out (23) MIDI Out +
(19) MIDI In +
(2)
(21) MIDI In -
25-Pin SUB-D
Connector female
() = Pin No.
Fig. 4.2/1: Pinning of the interface-connector
(5)
+
(4)
MIDI Out
(5)
+
(4)
MIDI In
(2)
(5)
+
(4)
MIDI Through
Fig. 4.2/2: Wiring scheme of a MIDI adaptor
Page 27
The real advantage of a MIDI operation can be
seen when two or more units are connected:
Here a daisychain-structure is built up, where
the MIDI Out of the first monitor is connected to
the MIDI In of the next system, and here from
MIDI Through to the MIDI In of the third system
etc., see Fig. 4.2/4.
This way all monitors in the chain will be
controlled by the master.
In menu 2 Midi Settings the option „Out/Thr“ has
to be selected, and the IR remote control of the
slave systems has to be disconnected by
pressing the IR ON / OFF key on the remote
control pointing to every slave, so only the master
will remain active for the RC 55 .
Note: If any problems with the data transfer
should occur when MIDI is active ( such as MIDI
overflow ) please check the bandrate in the MIDI
Settings menu and select the option „RS-232“.
The RS-232 interface in general has been
provided to allow for a data-transfer between the
O 500 C and a personal computer. The presets
for this interface are made in menu 2 Midi Settings, as described above, in the position „Baudrate“ the option „RS-232“ is selected.
Fig. 4.2/5 shows the wiring scheme of the
connecting cable between the O 500 C and a
personal computer for transferring parameter
settings, as described in chapter 6.2. This is a
so called modem cable, which is available in normal computershops, e.g. RS Components Nr.
777-558.
O 500 C #1
MIDI
In
MIDI
Out
O 500 C #2
MIDI
In
O 500 C #3
MIDI
Through
MIDI
In
O 500 C #n
...
MIDI
Through
MIDI
In
Fig. 4.2/4: MIDI-chain (Out: Option Out/Through)
9 PIN SUB-D FEMALE
1
5
6
9
(2)
1
13
25
14
MIDI
Out
(MIDI
In)
(7)
(MIDI
Out)
13
25
(3)
MIDI
In
1
14
(3)
(2)
1
13
25
14
25 PIN SUB-D MALE
Fig. 4.2/3: Wiring scheme of the cable for a Master-Slave-operation of two O 500C
Page 28
Fig. 4.2/5: Wiring scheme of the connecting cable
between O 500 C and a PC
4.2.2 Midi-Commands
This paragraph explains the structure of
commands, which is controlling the individual
functions of the digital controller and recalls
adjustents or setup-menus. As an external
controller any IBM-compatible PC may be used,
which is copnnected to the O 500 C via the
adaptocable, as described in Fig. 4.2/5.
For the data-transfer a separate, small DOSprogramme „BIN2SYX“ will be needed, which
can be supplied free of Charge by KLEIN +
HUMEL.
This programme is copied into a menu of the
HDD in the PC and when copied it is recalled by
typing in:
C:\bin2syx p x 2 9600 XXX Y
The syntax of this command is described more
detailed in Fig. 4.2/6, which als contains the
possible control-functions of the system.
Examples:
The O 500 C is connected to the COM2 port of
a PCs and the bin2syx software has been copied
into file C:\
1. Recall setup 004:
Type in: c:\bin2syx p x 2 9600 64 4
2. Adjust the Input Gain setting to -10 dB :
Type in: c:\bin2syx p x 2 9600 65 118
3. Adjust „Power Amp -10 dB“ :
Type in: c:\bin2syx p x 2 9600 129 1
O 500C MIDI Commands
Syntax: BIN2SYX p x 1 9600 XX Y
1 = Int: 1=COM1; 2=COM2
9600 = Baud Rate
XX = No. Of Command (taken from table)
Y = Value (as taken from table)
No. Of Command
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
Name / Function
Value
Load Setup
Input Gain
0 = Setup 000 ... 14 = Setup 014
0 = -128 ... 128 = 0
Channel Gain Sub
Channel Gain Low
Channel Gain Mid
Channel Gain High
0 = -18 dB ... 48 = +6 dB [Inc. 1 = 0.5 dB)
--- " ----- " ----- " ---
Channel Delay Sub
Channel Delay Low
Channel Delay Mid
Channel Delay High
t[ms] = Y * 0.3628
--- " ----- " ----- " ---
Phase Invert Sub
Phase Invert Low
Phase Invert Mid
Phase Invert High
0 = no, 1 = yes
--- " ----- " ----- " ---
Channel Mute Sub
Channel Mute Low
Channel Mute Mid
Channel Mute High
0 = no, 1 = yes
--- " ----- " ----- " ---
Input Select
Master Delay
0 = Analog, 1 = Digital
t[ms] = Y * 0.3628
Limiter Release
0 = 10 dB/s ... 240 = 250 dB/s
Mute Attenuation
Mute
Delay Link
0 = +40 dB ... 40 = 0 dB
0 = off, 1 = on
0 = off, 1 = Mid + Hi, 2 = Mid + Hi + Low
Top (= Line)
Subwoofer (= Column)
Gain Offset Analog
Gain Offset Digital
Logo
0 = Z1, 1 = Z2, 2 = Z3 ...
0 = S1, 1 = S2, 2 = S3 ...
0 = -30 dB ... 60 = +30 dB
0 = -30 dB ... 60 = +30 dB
0 = off, 1 = on
Input Routing
0 = Left, 1 = Right, 2 = Left + Right
Fig. 4.2/6: Listing of the individual commands for
the O 500 C
Page 29
5.1 Room EQ
General
The parameter settings of the O 500 C have
been optimized by K + H in the way, that in a
non-reflecting surrounding there will be a liner
frequency response at the system.
Such a reflection-free surriunding will not be
possible under practical conditions- on the
contrary- room and positioning of the monitors
will lead to significant unlinearties in the
frequency-response.
How inlinearities of the frequeny-response are
generated by the location in the room.Base of
this acoustic reaction is the principle of
interferences of soundwaves. In general, there
will be always two or more sound waves needed,
which are generated from two sources with a
certain distance to each other.
two interfearing signals may to the double level
(0°-phase shift) or a complete cancellation of a
frequency (180°-phase shift). In between these
two figures all levels/phaseshifts are possible.
How to use the internal room-EQ Feature
The O 500 C is offering three powerful functions
for the compensation of unlinearities in the
frequency response, which were caused by the
monitor’s location: The compensation through
individually generated parameter setups (
chapter 6.4), the fully parametric EQ ( chapter
5.2) plus the comfortable local EQ-function, as
described below. All adjustments will be made
in the menu 1 EQ Set of the EQ-menu. On the
following pages all options from this menu will
be introduced, including some typical examples.
Important notes
When adjusting the local EQ function please
keep in mind that the examples given here are
not a strict line to be followed, they are just a
recommendation how to do it practically.
After every adjustment we recommend to listen
carefully to the system by a selection of wellknown music. It would be advantageous to make
a plot of the resulted frequncy response before
and after the adjustment, so it can be seen from
the curves how the frequency curves have been
changed.
The last point takes a very important role, as
here will be the largest influence to the relation
of absorption or reflection of sound energy, and
the level of the secondary soundsources.
Page 30
The number of frequencies or ranges of
frequencies of such a frequency influenced by
interferences can hardly be determined, as their
levels, phases and results are depending on
many factors, which cannot be calculated or
eliminated, such as:
-The distances between test-microphone ( or
listening area ) to the monitor and any reflecting
surface
-The dispersion of the speaker-system over the
whole frequency-range
-Various Eigenschaften of the surfacestructure, material, mecanical construction etc.
Interferences will always occur, if two or more
signal sources are active in a room. One of these
sources is the monitor itself, so it is called the
PRIMARY SOURCE.
Secondary signal sources are generated by the
dispersion of the primary source, which is
reflected from various surfaces, such as walls,
ceiling, windows, floor, and even furniture and
decoration in that room.The diffusion of a
soundwave on any surface is determined by two
parameters: the bending of the soundwave at
the edges of the surface and the reflection from
it’s plain surface, if it is larger than the wavelength
of the soundwave’s frequency.
These reflected secondary soundwaves are
interfering with the primary waves from the
monitor, and will lead to an audible difference.
Low Cut
With this function it is possible to adjust the
low frequency cut off of the complete system.
The low cut can be set between 30 Hz and
80 Hz in steps of 10 Hz with a steepness of
12dB per octave:
Fig. 5.1/1: Low Cut function, plotted from 30...80
Hz (in steps of 10 Hz)
Lifting the lower cut off frequency is
recommendable in case there is a strong
room mode, so cutting off the system below
that frequency will cure that problem. It will
also serve to simulate the sound of a smaller
monitor system.
High EQ
The high EQ will have influence on the level
at higher frequencies, the adjustment ranges
from +1 dB to -4 dB:
Bass roll off EQ
Here the intensity of the low frequency level
can be lowered in steps of 2 dB up to -10 dB
without changing the lower cut off frequency:
Fig. 5.1/4: The High EQ – funktion, plotted from
+1...-4 dB (in steps of 1 dB)
Fig. 5.1/2: Bass EQ - funktion, plotted from 0...10 dB (in steps of -2 dB each)
Lowering the level in the bass frequency
range will allow for a perfect match when the
monitor is close to a wall or in a corner, as
these locations always will lead to increase
LF intensityies.
Increasing the high level gain may have some
positive results in studios, where a dry
acoustic or high absorption of high
frequencies may occur.
Here we do not have the typical interferences
as in the low and midrange, but a highly
reduced diffuse sound field which can be
compensated.
Mid EQ
With this funktion the level of the mid
frequencies can be reduced in 1 dB-steps up
to a max. of -5 dB:
Fig. 5.1/3: The Mid EQ – funktion, plotted from
0...-5 dB (in steps of -1 dB)
Page 31
5.2 Parametric EQ
with the same properties and adjustments as
described in menu 3 EQ1 ... EQ10.
General
Type:
Here the basic mode of the individual EQband is determined.
The following options will be possible:
In addition to the previously described local EQ,
the O 500 C is fitted with 10 fully parametric EQ
bands, which can be selected to be either bell
or shelving and highpass/lowpass character with
adjustable gains, Q-factor and slopes.
The individual EQ bands are arranged in a
sequence of 10 menupoints of the EQ menu,
every EQ band has it’s own menupoint. The first
EQ band can be found in menu 3 EQ1, the last
one in point 12 EQ10. All adjustments can be
stored in menu point 4 EQ Setup under a user
selectable name, and can be recalled at any
time.
These EQs may be used in addition to the room
EQs to achieve a more detailed correction of
unlinearities in the frequency response, which
have their origin in the local positioning of the
monitor.
o
o
o
o
High shelving with 12 dB/Oct. slope
High shelving with 6 dB/Oct. Slope
Low shelving with 12 dB/Oct. Slope
Low shelving with 6 dB/Oct. Slope
o Peak (bell characteristc)
o
o
o
o
Highpass with 12 dB/Oct. Slope
Highpass with 6 dB/Oct. Slope
Lowpass with 12 dB/Oct. Slope
Lowpass with 6 dB/Oct. Slope
The figures 5.2/1 and 5.2/2 are showing
The main area of use is for the compensation of
unlinearities which are mainly caused by the
room itself ( construction, shape, material etc. )
which can not be fully compensated with the
room EQs.
In this chapter the complex operations and
adjustments of the parameteric EQ’s are
described and backed up by practical examples
and diagrammes. Please note: all examples and
diagrammes given may not be useful for an individual setup!
Fig. 5.2/1: Low and high shelvingfilter, slope: 6
and 12 dB/Oct., Gain = +6 dB, Q-factor = 0.7
In a normal, average listening zone ( room ) the
absorption of materials in the room can be very
different, and are very much depending on the
frequencies. As a result there are frequency
depending levels in the diffuse sound field and
the sound field as it is recognized by the listener,
both adding up in a non-linear frequency
response.
Description of parametric EQ’s
Following the various adjustments and
operation-modes of the 10-band parametric EQ
will be described in detail, and made more
understandable by offering some examples of
frequency responses. All 10 bands are equipped
Page 32
Fig. 5.2/2: High and lowpasses, slope: 6 and 12
dB/Oct., Gain = 0 dB, Butterworth characteristic.
examples for high- and low - shelving filter
and high- and lowpass filters with different
slopes from the -3 dB corner frequencies 100
Hz resp. 1 kHz.
The example in the drawing shows
highpasses with a number of corner
frequencies:
Q-factor (adjustment from 0...6355):
Here the Q-factor of every filter band can be
adjusted. The example in the diagram shows
a peak EQ of a mid frequency at 1 kHz and a
gain of +10 dB with different adjustments for
the Q-factor:
Fig. 5.2/5: highpasses with crossover
frequencies of 50Hz, 100Hz, 700Hz, 2kHz, 6kHz;
selected Slope 12 dB/Oct; Gain = +10 dB;
Butterworth characteristic resp. at high and
lowpasses the adjustment of the 3dB corner
frequency.
Fig. 5.2/3: PEQ-filter (Bell); Q = 0.5, 1, 2, 4; Gain
= +10 dB; midfrequency = 1 kHz
Gain (range of adjustement -99...+12 dB):
This adjustment has a direct influence on the
gain of every filter band. The examples in
figure 5.2/6 and 5.2/7 are showing different
gain adjustments in a peak and a shelving
filter:
Fig. 5.2/4: High-shelvingfilter; Q = 0.4, 0.6, 0.8,
1.0; Gain = -6 dB; crossover frequency = 1 kHz
Frequency (range of adjustment 10...20000
Hz):
When the Peak mode is selected, the mid
frequency is adjusted, in case of the shelving
filters or high- and lowpasses the -3 dB corner
frequency is selected.
Fig. 5.2/6: PEQ filter (Bell); Gain: -10, -6,
-3, 0, +3, +6, +10 dB; mid frequency = 150 Hz;
Q=2
Page 33
Remarks fo adjustments
Fig. 5.2/7: Low shelving filter; Gain: -10, -6, -3,
0, +3, +6, +10 dB; crossover frequency = 300
Hz, Q = 0.7
The neccessary adjustments of the parametric
EQ’s should be based on a correct measurement
in the beginning. This measurement should not
only be taken in the listening position, but also
at a number of other positions in the listening
area ( 10 to 15 are recommended ). These
results should be taken for an „averaging result“
and for the final decision, which frequencies
should be adjusted or not! With some experience
it will be possible to see which adjustment will
also have some influence on other bands at an
octave or more above. Finally the result of the
adjustment should be checked and verified again
by a number of measurements in the listening
area.
A measurement in different listening position is
based on the knowledge, that a positive
adjustment may have a negative result in an
other part of the listening zone.
Accurate measurements are the basics for a
successful adjustment of the PEQ functions
described here.
This is the main reason why a complete
adjustment on audible results from the individual filter bands is not recommended. The
adjustments should be reduced to the low
frequency area.
Page 34
6 Calculation of Parameters
General
The loudspeaker parameter setup contains all
adjustments and informations of the internal digital controller to obtain the desired frequency
and phase response plus all limiter and
protection functions for the O 500 C.
For every O 500 C an individual set of
parameters will be set at the factory. This set of
parameters contains far more information as it
is the case in any other digital or analog
controlled monitor on the market today.
Normally these functions are reduced to the
selection of crossover frequencies and gains in
every amplifier stage, an EQ of the frequency
response for a better linearisation and a setup
for the limiters.
The O 500 C is supplied with a complex
equalisation for every driver system. The EQ
is not only reduced to the frequency and
amplitude of the whole system, but also
includes the adjustment of the phase
response down to 40 Hz!
The adjustments contained in loudspeaker
parameter setup can be looked at in three
groups:
1. Filter coefficients of the FIR filter
bandpasses (FIR = Finite Impulse Response)
2. Limiter parameters
3. Output scaling factors
The adjustments within a loudspeaker parameter
setup can not be influenced by the user, as any
change (if possible) would result in a loss of
quality of the transmission datas of the monitor.
In the FlashROM-memory of the built-in digital
controller a number of parameter settings are
stored as a standard. Each of them can contain
different acoustic results.
A change between the stored parameter settings
is made in the menu „Monitor / Subwoofer“ of
the MAIN menu and can be made while using
the monitor (see chapter 3.2, menu step 8).
- The serial interface (RS-232) socket of a PC
is linked to the serial connector of the
O 500 C by using a standard interface cable,
as described in chapter 4.2.
- Switch ON the O 500 C by the POWER
SWITCH and check if in menu
2 Midi Settings of the System-Menu
„Baudrate“ the option „RS232“ is activated,
see chapter 3.
- Now copy all new data files supplied by K+H
(on a FDD, by E-Mail or on a CD-R) into a file
of the HDD of the PC. Then the PC has to be
rebooted and started in the DOS-mode.
- After changing into the directory containing
the files just type in „TXMATRX“ to start the
data transfer
- Wait until the display will show „Input Gain“,
now the transfer is completed.
- Switch OFF the O 500 C and - after a few
seconds - ON again, wait for the notice:
„Wrong Filter Setup“ and press ENTER
- Now disconnect the O 500 C from the PC.
Room specific parameter settings
To compensate for room and positioning specific
unlinearities in the frequency response, it
alternatively is possible to make up a room
specific loudspeaker parameter setup instead of
using the Room- or PEQ sections described in
chapter 5.1 and 5.2. This will contain the
adjustments of the EQ’s but without the
characteristic influence on the phase response.
In order to do this it is neccessary to make a
complete measurement of the installed monitor
system in the relevant room or studio by using a
special measuring setup which is capable of
calculating the new filtersetups. In addition to this
it will be possible to also include a „individual
coloration“ of the response according to personal
preferences.
The measurements needed for this setup, plus
the neccessary calculations and corrections can
be carried out at extra cost by K+H or by a
subcontractor.
Loading of loudspeaker parameter setups
Note: New loudspeaker parameter setups can
only be downloaded into the system by erasing
the old, existing files. It is not possible to add
new settigs to the list!
Page 35
7 Technical Data
Acoustical Specification
Freefield frequency response
30 Hz - 20 kHz, +/- 1,5 dB
Self generated noise level at 10 cm distance
25 dB(A)
THD
< 0,5% in 1 m distance from
100 Hz @ 101 dB /SPL
Sound Pressure Level ( SPL )
im halfroom
123,4 dB /SPL @ 1% THD
averaged between 100 Hz und 6 kHz
Connectors
Inputs analog
Number, type
Impedance elektron. balanced
Impedance transformerbalanced
max. input level
Common mode rejection ( CMMR )
1 x XLR
10 kOhm
10 kOhm
24 dBu
> 80 dB @ 15 kHz
Outputs analog
electronically balanced (Sub Out)
Output impedance
resolution, principle
Outputrange steps
1 x XLR
< 70 Ohm
24 bit AD, D/S
16, 12, 6 dBu
Inputs digital
AES/EBU
S/P-DIF
Impedance
XLR
BNC
110 Ohms (transformer balanced)
75 Ohm (unbalanced)
AES/EBU
S/P-DIF
Outputs digital (through)
AES/EBU
XLR
Remote control, Data interface
MIDI, RS232
Baudrate
IR-remote controle
D-Sub D 25
9600, 31520
IR-receiver
THD @ 1 kHz, + 6 dBu
Noisefloor
0,0004 %
- 126 dBFS
AD-Conversion
resolution, principle
Clockrate
Pre-Emphasis
24 bit stacked AD, ∆/Σ
44,1 kHz, 48 kHz
50/15 µs
DA-Conversion
resolution, principle
24 Bit, D/S
Latency behaviour
basic latency
filter latency
5-7 ms
depends on type and setting of filter
Filter algorithm
max. number of filters
Type of filters
FIR-Filter (finite impulse response)
depending from filter length, typ. 50
Linear-, mixed linear/minimal,
minimalphase
Performance
Signal processing
Filter section and Limiter
Factory presets
Page 36
Number of ways
Equalisations
Slopes
Crossover frequencies
Peaklimiter
RMS-Limiter
4
individually amplitude and phase
linearised
fixed and defined
520 Hz and 2800 Hz
feed-forward with 1,5 ms,
controlled overshot for
max. peak power efficiency of the
power amps
Modelling of coil and magnet
temperature
Room specific filter settings
see factory presets, needs individual lineup on site by K+H or subcontractor
User defined equalizer
Filter algorithm
Number of filters per channel
fullparametric filtertypes
IIR-Filter (infinite impulse response)
10
High-/Low-shelving 6dB/oct,
12dB/oct;
High-/ Low-pass 6dB/oct,
12dB/oct; peakfilter
EQ for local adjustments
response)
Filteralgorithm
IIR-Filter
Number of filters
Type of filters
4
Low-Cut; Low; Mid; High
Master Delay
Channel Delay
0 - 999 ms; 0 - 333 m
0 - 92 ms
Bass
PMS (THD < 0,1%)
Peak
400 W
500 W
Midrange
RMS (THD < 0,1%)
Peak
230 W
280 W
Treble
RMS (THD < 0,1%)
Peak
290 W
360 W
High
750 mm
Wide
Deep
400 mm
467 mm
(infinite
impulse
Delay
Poweramplifiers
Mechanical Specification
Size
Volume
140,0 l
Weight
65 kg
Drivers, all magnetically shielded
Woofer
Midrange dome
Tweeter
300 mm / 12“
76 mm / 3“
25 mm / 1“
Mounting hardware
1 x M20 per side / 1 x M20 bottom
Fitting-hardware
LH35 + LH28/LH29
LH36 + LH28/LH29
Enclosure
Surface
Colour
Other colours
Painted
charcoal grey (RAL 7021)
upon request
Page 37
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertising