Bogen M600, M450 User Manual
M-Class Amplifier
M300, M450, & M600 Models
Installation and Use Manual
© 2001 Bogen Communications, Inc.
All rights reserved. 54-2037-01R3 0210
Notice
Every effort was made to ensure that the information in this
guide was complete and accurate at the time of printing.
However, information is subject to change.
Important Safety Information
WARNING: To Reduce The Risk of Fire Or Electric Shock,
Do Not Expose This Apparatus To Rain Or Moisture.
Always follow these basic safety precautions when installing and
using the unit:
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with dry cloth.
7. DO NOT block any ventilation openings. Install in accordance with the manufacturer’s instructions.
8. Do not install near any heat sources such as radiators, heat
registers, stoves, or other apparatus (including amplifiers)
that produce heat.
9. Do not defeat the safety purpose of the polarized or
grounding-type plug. A polarized plug has two blades with
one wider than the other. A grounding-type plug has two
blades and a third grounding prong.The wide blade, or the
third prong,are provided for your safety. If the provided plug
does not fit into your outlet, consult an electrician for
replacement of the obsolete outlet.
10. Protect the power cord from being walked on or pinched,
particularly at plugs, convenience receptacles, and the point
where they exit from the apparatus.
11. Only use attachments/accessories specified by the manufacturer.
12. Unplug this apparatus during lightning storms or when
unused for long periods of time.
13. Refer all servicing to qualified service personnel. Servicing is
required when the apparatus has been damaged in any way,
such as power-supply cord or plug is damaged, liquid has
been spilled or objects have fallen into the apparatus, the
apparatus has been exposed to rain or moisture, does not
operate normally, or has been dropped.
Domestic and International Listings
UL and C-UL Listed.
IMPORTANT
CAUTION: TO PREVENT THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER (OR
BACK). NO USER-SERVICEABLE PARTS
INSIDE. REFER SERVICING TO QUALIFIED
PERSONNEL.
The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert
the user to the presence of
uninsulated “dangerous voltage”
within the product’s enclosure
that may be of sufficient magnitude to constitute a risk of electric shock to persons.
The exclamation point within an
equilateral triangle is intended
to alert the user to the presence
of important operating and
maintenance (servicing) instructions in the literature accompanying the appliance.
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 Ground Terminal..........................................................................................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
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 frontend 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 electronic 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 thermal 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 independentlycontrolled, 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 installations.The control knobs are located in a recessed section of the cast aluminum front panel to reduce the likelihood 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 * Instruction Manual
* Control Knob Cover * Balanced Input Module (pre-installed)
* 4 Rubber Feet & Screws
1
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 percent 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.
2
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 affected 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).
3
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