Bogen Stereo Amplifier M600 User Manual

M-Class Amplifier  
M300, M450, & M600 Models  
Installation and Use Manual  
© 2001 Bogen Communications, Inc.  
All rights reserved. 54-2037-01R3 0210  
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Contents  
Page  
INTRODUCTION ..................................................................................................1  
Package Contents................................................................................................................1  
PANEL DESCRIPTIONS ....................................................................................2-3  
M-Class Front Panel............................................................................................................2  
M-Class Rear Panel ............................................................................................................3  
INSTALLATION ..................................................................................................4-6  
Installation Components....................................................................................................4  
Ventilation ............................................................................................................................5  
Rack Mounting ....................................................................................................................5  
Rear Rack Mounting ..........................................................................................................5  
Table Mounting ....................................................................................................................5  
Module Installation..............................................................................................................6  
CONNECTIONS ....................................................................................................7  
Speakers ................................................................................................................................7  
Low-Impedance Speaker Connections ................................................................7  
Earth GroundTerminal..........................................................................................7  
70V “Transformer-Coupled” Speakers ................................................................7  
Standard Input Module ......................................................................................................7  
Balanced Input Connections ................................................................................7  
Unbalanced Input Connections............................................................................7  
OPERATION......................................................................................................8-11  
Controls & Connectors ................................................................................................8-9  
Level Controls ........................................................................................................8  
Sleep Mode Defeat ..............................................................................................8  
Channel Balance....................................................................................................8  
Lo-Cut Switch ........................................................................................................8  
Effects Loop............................................................................................................9  
Output Feeds..........................................................................................................9  
Modes of Operation ....................................................................................................9-10  
Stereo Mode ..........................................................................................................9  
70V Mono Mode ................................................................................................10  
Dual Mono Mode ..............................................................................................10  
Audio Buses ........................................................................................................10  
Modules ..............................................................................................................................11  
Standard Input Module......................................................................................11  
Standard Input Module Priority Jumper..................................................................11  
Standard Input Module Gain Switches ..................................................................11  
Other Input Modules..........................................................................................11  
Module Priority....................................................................................................11  
Module Controls..................................................................................................11  
APPLICATIONS..............................................................................................12-13  
TROUBLESHOOTING ........................................................................................14  
SPECIFICATIONS................................................................................................15  
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Introduction  
Bogen's M-Class amplifiers deliver on what professional sound installers need most: Flexibility, Power, and  
Reliability.  
Flexibility  
The M-Class allows for the installation of up to 2 input modules, accepting inputs from microphones, telephone  
systems,stereo sources,mono sources,or daisy-chaining of amplifiers.Each M-Class model comes standard with  
a single, professional-quality, stereo, high-impedance balanced input module.  
The M-Class has three operating modes to meet different installation needs - Stereo, Dual Mono, or 70V Mono.  
Front panel controls allow independent operation of each power amplifier channel in stereo mode. In either  
70V Mono or Dual Mono modes, the inputs form a 2:1 mixer with the front panel controls setting the signal  
levels from each input.Prioritized input modules and 2:1 mixer operation allow the M-Class to supply the front-  
end signal processing required in paging systems and the power to cover any size installation.  
Power  
With three different models (M600, M450, and M300), the M-Class provides 2-channel operation at 600W,  
450W, and 300W per channel into 4-ohm loads. Single channel, 70V Mono operation capacities are 1200W,  
900W, and 600W. Along with being powerful, these amplifiers are also compact - using up only 2 rack spaces  
(3-1/2") in a standard 19" rack.  
Reliability  
Driven by a conservatively-rated toroidal power transformer, these amplifiers are built for solid performance  
with low distortion and a high slew rate. Output module circuitry is located away from input module circuitry,  
minimizing noise and ground loops.The amplifiers require little maintenance and cleaning as internal electron-  
ic components are located outside of the forced air-stream flow.Front-mounted fan filters provide easy removal  
and cleaning.  
M-Class amplifers have a variety of electronic protection circuits including overcurrent, DC voltage, and ther-  
mal circuits. A special Clip/Limiting circuit continuously monitors the amount of distortion in the output signal  
and reduces input levels as the amplifier approaches clipping. Back-Slope™, Bogen’s unique voltage stabilization  
circuitry, regulates the AC energy supplied to the power toroid.This improves both system performance and  
reliability despite varying AC supply conditions.  
An energy-conserving sleep mode (defeatable) with instant-on return signal operation reduces wasted heat  
production in paging systems with intermittent use. In addition, large output heatsinks and dual independently-  
controlled, high-output, variable speed fans provide superior cooling and quiet operation while reducing dust  
accumulation.  
Bogen's M-Class amplifiers are enclosed in a heavy-gauge steel chassis, which prevents mechanical damage to  
the unit's internal components even if the unit is subjected to rough handling and excessive portable installa-  
tions.The control knobs are located in a recessed section of the cast aluminum front panel to reduce the like-  
lihood of mishandling and damage.The angled design of the amplifier's front panel allows easy finger access to  
the front knob cover when the amplifiers are stacked tightly in a rack.  
Package Contents  
* M-Class Amplifier  
* 2 Rack Ears  
* 2 Filters and Grilles  
* Control Knob Cover  
* 4 Rubber Feet & Screws  
* Instruction Manual  
* Balanced Input Module (pre-installed)  
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Panel Descriptions  
M-Class Front Panel  
1. Status Indicators  
The Status LED is a multi-purpose indicator that lights in three colors to show status. One for each channel.  
Green - Amplifier is on and operating normally.  
Amber - Amplifier is in low-power consumption Sleep Mode.  
Red - Amplifier has protected itself due to a fault condition.  
2. Signal Indicators  
Illuminates green when signal is present at the input. One for each channel.  
3. Clip/Limit Indicators  
This indicator illuminates amber when there are excessive signal levels or very low impedance output loads.A  
built-in Clip/Limiting circuit activates and reduces input signal levels when output distortion exceeds a few per-  
cent or when the output load draws too much current. One for each channel.  
4. Power Switch/Circuit Breaker  
Controls AC power to the amplifier and also works as a circuit breaker. If the circuit breaker trips, push it to  
the OFF position (O) and then to the ON position ( l ).  
5. Fan Grilles  
Removable fan grilles are provided to allow access to the dust filters for cleaning.  
6.Volume Controls  
Detented (40 position) knobs are recessed for protection from mechanical damage. One for each channel.  
Knob Cover (not shown - see #4 on page 4)  
Removable cover protects both volume controls from casual tampering or brushing.  
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Panel Descriptions  
M-Class Rear Panel  
1. Low-Impedance Outputs  
Accepts up to #10 spade lugs for low-impedance speaker connections.  
2. Channel Balance  
Only active in Dual Mono mode. Allows one channel’s volume to be adjusted relative to the other channel.  
3/4. Effects Loop In/Out  
The effects loop connectors provide an insertion point for outboard signal processing equipment when the  
M-Class is operating in either 70V Mono or Dual Mono mode, where inputs provide a 2:1 mixer function.  
5/6. Output Feeds (Pre/Post-EQ)  
Two different output feeds are provided that can supply signal to other audio equipment. Both outputs are  
designed to feed high-impedance, unbalanced inputs of external equipment.The Pre-EQ Output Feed provides  
a signal before any external signal processing.The Post-EQ Output Feed provides a signal that has been affect-  
ed by the external signal processing equipment and the lo-cut filter.  
7. Operational Mode Selector  
The M-Class amplifer has 3 distinct modes of operation (Stereo; 70V Mono; Dual Mono) that are designed to  
provide a wide range of application coverage. For a description of the different modes, see the Operation sec-  
tion of this manual.  
8. Fan Exhausts  
Two independent, variable speed cooling fans respond as needed to keep the amplifier cool and reduce dust  
build-up.  
9. 70V Mono Speaker Output  
For 70V constant voltage speaker systems. Provides a single channel of amplification.  
10. Chassis Ground  
Provides convenient access to earth ground.  
11. Lo-Cut Switch  
Select a low-frequency roll-off of 65 Hz or 125 Hz for transformer-coupled and horn speakers. Flat position  
allows full low-frequency performance.  
12. Module Bay  
Accepts one or two Bogen input modules (one module included with amplifier).  
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Installation  
Installation Components  
1. Rack Ears  
Prior to installing the amplifier,you will need to attach the installation rack ears if you intend to install the ampli-  
fier in a rack and complete the setup process.  
Remove the 6 front most cover screws on each side panel of the amplifier and attach rack ears as shown.  
2. Dust Filter  
Insert the dust filter into the fan grille before attaching the fan grille to the amplifier.  
Filter Maintenance  
Dust filters are provided with the M-Class amplifier to reduce the build up of dust on the heat sinks. Periodic  
cleaning should be done when there is a noticeable build up of dust on the filters.To clean the filters, remove  
them from the grilles and wash, vacuum, or tap them out. Promptly replace them.  
Caution:  
The fan blades are accessible when the grille cover and filter are removed.  
Be careful not to place your finger or other objects into the fan.  
3. Fan Grille  
To insert or replace the grilles, first insert the tabs on the wider end of the grille in to the notches in the front,  
center casting. Snap the other end of the grille in to the snap slots. Check that the grille is securely in place. To  
remove, pry the end of the cover closest to the rack ears up until the snap tabs disengage.  
4. Knob Cover  
To protect the amplifier controls from casual tampering, the volume level controls are concealed behind a  
removable cover. The cover snaps into place with tabs at the top and bottom.To remove the cover, squeeze  
both ends of the cover, then gently dislodge the top and then the bottom. Be careful not to tip the top of the  
cover too far forward while removing or the snap-in tabs could be damaged.To replace, simply snap it back into  
place.  
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Installation  
Ventilation  
The M-Class was designed to be placed on a table or rack-mounted.When rack mounted, the amplifiers can be  
stacked one on top of the other for maximum use of the rack.  
An open air space of at least 4" must be provided at the front air intakes of the amplifier, and the rear exhaust  
must have at least a 4" gap from any obstructions to ensure adequate cooling. This applies to both rack-  
and table-mounted amplifiers.  
Care should also be taken to ensure that the front intake air is not considerably warmer than the ambient air  
temperature. Mount the amplifiers low in the rack so that heat dissipation from other equipment does not  
warm the amplifier's intake air.  
Rack Mounting  
Rack ears are included with the amplifier to allow  
mounting in 19" racks. Attach the rack ears as  
shown in the Installation Components section. If any  
feet have been attached to the bottom of the  
amplifier, remove them. Load the amplifier into the  
rack and secure it to the rack with appropriate  
hardware (not included).  
Rear Rack Mounting  
For greater rear support when rack mounting an  
M-Class amplifier, the RPK86 Rack Mounting Kit  
(not included) can be attached to the rear of the  
amplifier by following the steps below.  
1. Remove and save the three cover screws  
from the chassis of the amplifier.  
Rear of Amplifier  
2. Position the rack attachment as shown.  
3. Replace and tighten the three cover screws  
to secure the rack attachments.  
Table Mounting  
Feet are provided with the amplifier to allow it to  
be placed on a tabletop. Attach the included feet  
to the bottom of the amplifier as shown.  
Attachment of the rack ears to the unit is option-  
al and purely aesthetic for table mounting.  
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Installation  
Module Installation  
Installation  
Two input module bays are available to accept various Bogen input modules thereby allowing users to customize  
the amplifier to suit the needs of the installation. Read the instructions included with the module and  
make the desired jumper setting changes before installing the module. The sleep switch should be  
set to the desired position prior to installation of the right module since it will be covered by the module (see  
Operation, Sleep Mode Defeat).  
The input modules are installed by simply sliding them along the card guides inside the module bays until the  
faceplate firmly sits against the M-Class chassis, then use the two screws supplied with the module to secure it  
to the chassis.  
Note: The input module included with the amplifier is pre-installed and factory set for 0 dB gain (can  
also be changed to 18 dB boost) and to be muted by any other module (can also be set to “no  
mute”).To change those settings, refer to the manual included with the module.  
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Connections  
Speakers  
Low-Impedance Speaker Connections  
When the amplifier is set to either the stereo mode or the Dual  
Mono mode (see Operation section), low-impedance speakers can be  
connected to either the "A" or "B" speaker output terminals. The  
amplifier is designed to work into speaker load impedances as low as  
3.2 ohms.  
The speaker terminals can accept up to a #10 spade lug and have inte-  
gral clamping plates which make wiring easier.The polarity of each set of speaker outputs (A & B) is indicated  
with a "+" and "-" sign. Use these indicators to ensure that the phasing of the speakers are correct. Do not  
ground the "+" output of either set of outputs. Doing so will cause the amplifier to go into protect mode, shut-  
ting down operation of the affected channel.  
Note: The "+" and "-" indicators are mirrored on "A" and "B" outputs. Be sure to make the correct connections.  
Earth GroundTerminal  
The earth ground terminal is provided as a convenient means to con-  
nect to the amplifier’s chassis/AC ground, if necessary. DO NOT con-  
nect the earth ground terminal to the "+" terminals of either output.  
No damage will occur if this is done, but the amplifier will go into pro-  
tect mode and shut down the effected channel.  
70V "Transformer-Coupled" Speakers  
The 70V speaker output terminals are only usable when the amplifier  
is in the 70V Mono mode (see the Operation section). In this mode,  
both channels are bridged into a single mono channel. Use only speak-  
ers that are designed to work with 70V audio systems when con-  
necting to these terminals.The speaker terminals can accept up to a  
#10 ring lug and have integral clamping plates which make wiring eas-  
ier. The 70V output terminals are indicated by a yellow field above  
them. The polarity of the output terminals is indicated for speaker  
phasing purposes. These output terminals must float and cannot be referenced to earth ground, so if they  
become grounded, the amplifier will go into protect mode, shutting down operation of the amplifier even  
though no damage to the amplifier will occur.  
Standard Input Module (included)  
Balanced Input Connections  
Balanced input connections are used when the source device pro-  
vides a balanced output (signal "+", signal "-", and ground "G").This  
type of connection is desirable when operating in electrically noisy  
environments, where long input cable runs are needed, or to  
ensure the lowest noise operation. If compatible with the source  
device, this type of connection is recommended.  
Unbalanced Input Connections  
When the source device provides only an unbalanced output  
(signal and ground), the input module should be wired with the  
"-" input shorted to ground (G).The unbalanced signal's shield  
wire is connected to the input module’s ground and the signal  
hot wire is connected to the "+" terminal. Since unbalanced  
connections do not provide the same amount of noise immu-  
nity that a balanced connection does, the connection distances should be made as short as possible.  
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Operation  
Controls & Connectors  
Level Controls  
The front-mounted level controls act differently depending on the mode of operation.  
In the stereo mode, each level control determines the volume of the corresponding  
amplifier channel as in a typical amplifier. In the 70V Mono and Dual Mono modes, the  
controls have a different function and determine the mix of the signal levels from the  
different input modules (input modules can be assigned to either the "A" or "B" chan-  
nel by the jumpers on the module).The front level controls determine the mix of the  
two input module signals.They do not control the volume level of each amplifier in  
these modes. Essentially, the volume level of both amp channels is fixed at maximum and the overall level of  
the mixed input module signals determine the output volume level.To increase the overall volume of the ampli-  
fier output, turn up both front panel controls by the same amount.This increases the signal level of each mod-  
ule's input into the amplifier while keeping the mix the same. Similarly, turn down both controls to the same  
knob position to reduce the overall output volume from the amplifier.  
Sleep Mode Defeat  
The M-Class amplifier includes a sleep mode feature that  
greatly reduces the power consumption of the amplifier  
after it has been idle for more than 3 minutes. Any audio  
activity present at the input will wake the amplifier up  
instantaneously so that there is no loss of audio. A sleep  
mode switch located in the upper right hand corner of the  
module bay can be set to activate or deactivate this feature  
using a thin, flat-bladed screwdriver. (If a module is inserted  
in the right bay, turn off the power and remove the module  
before proceeding.) If the sleep feature is desired,make sure  
the switch is in the down position. If the sleep feature is not  
desired, make sure the switch is in the up position.  
Channel Balance  
Channel Balance only works in the Dual Mono mode of operation. In Dual Mono  
mode, both amplifier channels get the same audio program at the same level.  
To provide some direct control over the amplifier volume levels, a Channel Balance  
control is provided.This control allows the adjustment of one amplifier channel out-  
put volume over the other.To reduce the volume level of channel "B" while leaving  
the volume of channel "A" unchanged, the Channel Balance control is rotated counterclockwise.The diminish-  
ing arrow with the "B" next to it indicates that rotating the control in that direction diminishes the "B" chan-  
nel volume.Likewise for reducing channel "A" volume.Putting the control at the center of rotation allows equal,  
and maximum, volume from both channels.  
Lo-Cut Switch  
The M-Class amplifier is a direct-coupled amplifier, which means that there are no out-  
put transformers used to deliver the 70V audio to the speakers. Because of this, the  
M-Class amplifier has a Flat frequency response below 20 Hz.This extended low fre-  
quency operation can be troublesome for some transformer-coupled speakers typical-  
ly used in 70V audio systems. The relatively inexpensive transformers used in these  
speakers cannot handle frequencies much below 60 Hz.When frequencies lower than this are applied to these  
speaker's transformers, they can saturate causing distortion and high instantaneous power consumption.  
The Lo-Cut filter allows a low frequency roll-off to be introduced into the output signal preventing the speak-  
ers from receiving too much low frequency content.The 65 Hz position should be used for all transformer cou-  
pled cone type speakers. The higher frequency roll-off of 125 Hz provides an extra level of safety for horn  
speakers. Some horn speakers can be adversely affected by frequencies below 120 Hz since they are designed  
to reproduce higher frequency signals.  
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Operation  
Effects Loop  
The effects loop connectors act as an insertion point for outboard signal processing  
equipment when the M-Class is operating in either the 70V Mono or Dual Mono  
modes. In these modes, the inputs and front panel controls form a 2:1 mixer. Connect  
the Effects Loop Out to the input of the external signal processing equipment.Connect  
the Effects Loop In to the output of the external signal processing equipment. Inserting  
an RCA jack into the Effects Loop In connector will automatically disconnect the input module signals from the  
power amp stage so it can be routed through the external equipment. Removing the jack from the Effects Loop  
In connector will reestablish the direct connection of the input modules to the power amp stage.The Effects  
Loop signals are quasi-balanced, which means that they are intended for use with unbalanced equipment but  
will improve the noise immunity. However, it is still a good practice to keep these connections as short as pos-  
sible.  
Output Feeds  
Two different output feeds are provided that can supply signal to other amplifiers and  
audio equipment.Both outputs are designed to feed high-impedance,unbalanced inputs  
of external equipment.The outputs are also quasi-balanced for better noise immunity,  
but connection lengths for these outputs should still be kept as short as possible.The  
Pre-EQ Output Feed provides the signal before any external signal processing affects it.  
The Post-EQ Output Feed provides a signal that has been affected by the external signal processing equipment  
and lo-cut filter. Depending on the application, it may be more desirable to use the externally-processed signal  
rather than the raw version of the signal.  
Modes of Operation  
Stereo Mode  
Placing the 3-position switch to its left most position puts the  
amplifier in the stereo mode of operation.The amplifier supplies  
two independent channels of low-impedance amplification in  
this mode (see Stereo Mode Block Diagram).These channels can  
be used to supply left and right audio for stereo installations of  
2 separate zones of amplification with different audio programs.  
When using the supplied input module in this mode, the input  
applied to the "A" input will be controlled by the "A" level con-  
trol and the output will be available on the "A" channel speaker terminals. Likewise for the "B" channel.When  
using other modules, there are jumper settings that allow those modules to apply signal to the "A" or "B" chan-  
nels, or both. See the application examples for more information on how to use the two audio buses.  
Stereo Mode Block Diagram  
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Operation  
70V Mono Mode  
Placing the 3-position switch to its right most position puts  
the amplifier in the 70V Mono mode of operation. The  
amplifier supplies a single channel of amplification in this  
mode (see 70V Mono Mode Block Diagram).This mode also  
mixes the signals from each input module into a mono pro-  
gram. Input signals of modules that are assigned to the "A"  
bus are controlled by the "A" level control on the front of  
the unit and likewise for modules whose outputs are  
assigned to the "B" bus.By assigning each module to a different bus,a 2:1 mixer is formed with the front-mount-  
ed level controls adjusting the mix. Additionally, one module can be set to mute the other when it is active,  
thereby providing an effective paging system (see the section on Module Priority). It is important in this mode to  
set the assignment jumpers on the two input modules so that their outputs are on different audio buses (see  
the section on Audio Buses). Speakers must be correct for 70V operation. (See section on 70V “Transformer-  
Coupled” Speakers).  
70V Mono Mode Block Diagram  
Dual Mono Mode Block Diagram  
Dual Mono Mode  
Placing the 3-position switch to its center position puts the  
amplifier in the Dual Mono mode of operation.This mode is  
similar to the 70V Mono mode except that the amplifier  
supplies two channels of low-impedance amplification in this  
mode (see Dual Mono Mode Block Diagram).This mode still  
mixes the input signal from the different modules but a  
Channel Balance control is provided to adjust the output  
levels of one channel against the other (see the section on  
Channel Balance). It is important in this mode to set the assignment jumpers on the two input modules so that  
their outputs are on different audio buses (see the section on Audio Buses). Speakers must be low-impedance  
type, not 70V type.  
Audio Buses  
The M-Class amplifier contains two separate audio buses.The "A" bus level is adjusted by the "A" level control  
on the front of the unit and the "B" bus is adjusted by the "B" Level control. Most Bogen modules provide a  
means to assign their output to either or both of the audio buses.The instructions that accompany the mod-  
ules will describe the jumper settings for these assignments.When using the M-Class amplifier in either the 70V  
Mono or Dual Mono modes, the module signals will be mixed. For maximum control when mixing signals, it is  
important that each of the two input modules be set so that the outputs feed different audio buses. Otherwise,  
proper mixing of the signals will be difficult. Check that each module is set to a different audio bus before  
installing it.  
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Operation  
Modules  
Standard Input Module  
The M-Class is shipped with one input  
module pre-installed.The module pro-  
vides 2 high-impedance, balanced, low-  
noise inputs, but can be replaced by  
other modules if desired. The input’s  
connectors, labeled A & B, correspond  
to the similarly marked rear speaker  
connections and front panel controls.  
The module’s inputs are permanently  
assigned to their respectively-labeled  
audio buses.  
Standard Input Module Priority Jumper  
The input module that comes stan-  
dard (and pre-installed) with the M-Class differs in priority capability from other Bogen input modules. The  
module has a priority jumper that can set it to be muted by any other modules installed or to never mute. Since  
it is incapable of muting other modules,it is always the lowest priority module.When signaled to mute by anoth-  
er module, it will reduce the level of both channel’s input signals by the amount set by the ducking control  
(DUCK).When the mute is released, the module will fade the input signal levels back to the previous level.  
When set to No Mute, it does not respond to muting from other modules and is, therefore, always available for  
use in mixing applications.The module is factory set to be muted by any other module.The module will have  
to be removed to change this setting.  
Standard Input Module Gain Switches  
A separate gain switch for each input channel is included in the module that comes pre-installed with the ampli-  
fier.The module is factory set for 0 dB gain. Set each switch for the channel’s desired gain, either 0 dB (X1) or  
18 dB (X8).  
Other Input Modules  
Various input modules can be installed in the M-Class amplifier. Refer to the instructions that come with each  
module for specific connection and setup information. The module jumpers must be set prior to  
installing the module.  
Module Priority  
Bogen input modules allow for up to 4 levels of priority. Each module (except the included input module, which  
comes standard with the amplifier) can both be muted by higher priority modules and mute lower priority mod-  
ules. The priority level of the module is set by the position of 2 jumpers on each module.  
Note: Even though 4 priority levels are available on the Bogen input modules, only two levels can be used with  
the M-Class since it only accepts 2 modules.  
It does not matter which priority level is set on the module, only that the intended higher priority module be  
set to some priority level that is higher than the intended lower priority module. However, Bogen recommends  
using Priority Level 1 (the highest available) for the higher priority module and Priority Level 2 for the lower  
priority module.  
Module Controls  
Each input module type has a number of controls such as Gain, Bass, andTreble.These controls affect the oper-  
ation of the amplifier as much as the ones mounted on the amp. Be sure to read the instructions with each  
module and be aware of its control setting when adjusting the overall operation of the amplifier.  
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Applications  
Application Examples  
Application 1:  
Simple 1-Zone, 70V Mono telephone paging system with background music  
Background music plays through the system when no page is being made. During a telephone page, the background  
music mutes to a predetermined level and the telephone page is heard.When the page is complete, the background  
music fades back to its previous level.  
Mode of Operation: 70V Mono  
Amplifier Adjustments: Volume of the telephone page is adjusted by the "A" Level Control, background music level is  
adjusted by the "B" Level Control. Set the Lo-Cut switch to 65 Hz.  
Module Adjustments:Adjust Gain to make each source’s input level similar.Adjust Bass &Treble (where applicable) to  
your preference.Adjust ducking control on MAX1R for desired level.Adjust Gate controls of TEL1S for optimum  
paging control.  
Application 2:  
Stereo low-impedance music system with microphone override  
Stereo program material plays into low-impedance speakers. When the microphone becomes active, the stereo  
music is muted to a predetermined level and the microphone is easily heard.When the microphone signal stops, the  
music fades back to its previous level.  
Mode of Operation: Stereo  
Amplifier Adjustments: Stereo music program wired to BAL2S inputs. Each stereo channel volume is controlled by the  
associated front level control. Microphone level is also affected by changes in these level controls, but is to be main-  
ly set by the Gain control on the MIC1X module. Not applicable in stereo mode.  
Module Adjustments:Adjust Gain of MIC1X to desired paging level. Adjust Bass &Treble of MIC1X module to appro-  
priate level. Adjust Gate controls of MIC1X for optimum paging control. Adjust ducking control on BAL2S for  
desired mute level.  
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Applications  
Application 3:  
Global music/message buffered and distributed to multiple amps with local override input for each amplifier  
Similar to the paging situation found at airport departure gates, global music/messages play when no local page is  
present. During local page (from departure gate microphone), music/message mutes to predetermined level and  
page is heard only in local area. When local page is complete, global music/message fades back to previous level.  
During local zone page, global music/message mutes only in local area, then fades back. Buffered global music/mes-  
sage signal is unaffected by local paging condition.  
Mode of Operation: 70V Mono or Dual Mono  
Amplifier Adjustments:Volume of local (departure gate) MIC is adjusted by the "A" Level Control. Global music/mes-  
sage source is adjusted by the "B" Level Control. Set Lo-Cut or Channel Balance, depending on mode of operation.  
Module Adjustments:Adjust Gain to make each sources’ input similar. Adjust Bass &Treble (where applicable) to your  
preference.Adjust Ducking on BRG1R for desired level. Adjust Gate control on MIC1X for optimum paging oper-  
ation.  
Application 4:  
2 mono zones, low-impedance speakers, telephone paging and background music. Zones have significantly  
different volume levels  
Background music plays through the system when no page is being made. One zone is low volume while the other  
is high volume. During a telephone page, the background music mutes to a predetermined level and the telephone  
page is heard at correct volume level for each zone.When the page is complete, the background music fades back  
to its previous level.  
Mode of Operation: Dual Mono  
Amplifier Adjustments: Volume of the telephone page is adjusted by the "A" Level Control. Background music level is  
adjusted by the "B" Level Control. Set the Lo-Cut switch to Flat or 65 Hz. Channel Balance control on rear of ampli-  
fier adjusts the volume level of one speaker zone over the other zone. Rotate the Channel Balance control towards  
the "B" marking (counterclockwise) to reduce the volume level of the speakers connected to the "A" output ter-  
minals while leaving the volume level of "B" speaker output unchanged.  
Module Adjustments: Adjust Gain to make each source’s input level similar.Adjust Bass & Treble (where applicable)  
as appropriate. Adjust ducking control on MAX1R for desired level. Adjust Gate controls of TEL1S for optimum  
paging control.  
13  
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Troubleshooting  
PROBLEM  
CONDITION  
CAUSE  
• Amplifier not plugged in.  
• AC outlet dead.  
Status LED is off.  
• Power switch off.  
• Breaker (power switch) tripped.  
- Turn off, then turn back on.  
• Level controls turned down.  
• No signal from source.  
• Input module jumpers in wrong bus configuration (if available).  
NO SOUND  
Status LED is green.  
Signal LED is off.  
Status LED is green.  
Signal LED is green.  
Clip/Limit LED is off.  
• 70V mono connections on amplifier incorrect.  
• Poor/broken speaker wiring.  
• Defective speakers.  
Status LED is green.  
Signal LED is green.  
Clip/Limit LED is off.  
• Input signal level too high.  
• Poor speaker connections.  
• Lo-cut switch set to Flat (70V mono system only).  
DISTORTED  
SOUND  
POOR  
Status LED is green.  
Signal LED is green.  
Clip/Limit LED is off.  
• Lo-cut switch setting.  
• Speaker wiring phasing.  
• Module bass control setting (if available).  
LOW-FREQ.  
RESPONSE  
(NO BASS)  
• DC level at signal input.  
• Load impedance too low.  
• Amplifier speaker output is short-circuited.  
• Amplifier too hot (check for proper ventilation clearances).  
INTERMITTENT  
OPERATION  
Status LED is red/green cycling.  
• Poor electrical connections at input.  
• Input cable routed near AC cables, power transformer, or  
other EMI radiating devices.  
Status LED is green.  
Signal LED is green.  
• Electrically noisy devices operating on the same AC circuit.  
• Poor equipment grounding.  
NOISE/HUM  
- Ensure that all AC safety grounds are connected.  
- Make sure that all components in audio chain are tied to the  
same ground.  
14  
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Specifications  
Technical Specifications  
M600  
M450  
M300  
Power Output  
70V Mono  
4-ohm  
8-ohm  
900W @ 5.5 ohms  
450W per channel*  
300W per channel*  
600W @ 8 ohms  
300W per channel*  
200W per channel*  
1200W @ 4 ohms  
600W per channel*  
400W per channel*  
Input Sensitivity  
At Backplane Connector or using  
Standard Input Module (incl.)  
(Module has Gain of 1)  
1.161V for 600W @ 4 ohms  
1.010V for 450W @ 4 ohms  
0.840V for 300W @ 4 ohms  
S/N Ratio (20K BW)  
Class of Operation  
Product Weight  
109 dB ref. 8 ohms, F.P.  
106 dB ref. 8 ohms, F.P.  
103 dB ref. 8 ohms, F.P.  
H
H
AB  
46 lb.  
44 lb.  
41 lb.  
Connectors: Power  
Input  
20A line cord**  
15A line cord  
15A line cord  
2 new Bogen std. 12-pin connector modules/RCA input  
Output  
5-pin "touch-proof" Barrier Strip, RCA Pre- & Post-EQ Output  
Power Bandwidth  
20-40 kHz .5% THD  
less than .02%  
THD @ 1 kHz rated power  
Load Impedance  
4-8 ohms, 70V  
Minimum Load Impedance (Stereo)  
Frequency Response @ 1 watt  
3.2 ohms  
20-20 kHz +/- 0.25 dB  
0.5 dB @ 8 ohms  
Output Regulation, 1 kHz direct  
1 kHz bridged  
1.5 dB @ 70V  
Inputs (Plug-in modules)  
AC InputVoltage Range  
Maximum AC Current  
Indicators  
Electronically balanced, high-impedance module standard, other modular input types available  
95-130V AC, 60Hz  
20A**  
15A  
12A  
Status (On/Protect/Sleep), Clip/Limit, Signal  
15 to 105 degrees F  
Temperature Range  
Cooling  
Forced AirVariable Speed Fan  
17" X 3-1/2" x 16"  
Physical Dimensions (W x H x D)  
Protection  
RF, DC, Low-frequency,Thermal, Low-Impedance, Circuit-Breaker, Short Circuit  
Special Features  
Sleep Mode, Back-Slope regulation, Stereo, Dual Mono, 70V Mono Operation,Toroidal Power Transformer  
* Both channels driven at nominal line voltage 120V AC, 60 Hz.  
** Requires 20A, NEMA 5-20R Type Receptacle.  
15  
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50 Spring Street, Ramsey, NJ 07446, U.S.A.  
Tel. 201-934-8500, Fax: 201-934-9832  
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