M-Class
Series Features
•
3 Models: M600, M450, and M300
•
3 stereo power levels: 600W, 450W, or 300W
per channel @ 4 ohms (both channels driven)
•
3 mono power levels: 1200W, 900W, or 600W
for 70V speaker systems
•
3 modes of operation to choose from:
70V Mono, Dual Mono, or Stereo
•
Low noise, low distortion, and high slew rate
•
Flexible modular input capability (2 module capacity)
•
Professional-quality, balanced, high-impedance
input module (included)
•
3 selectable low-frequency roll-off choices
•
2x1 mixer function when in mono modes
•
Prioritized inputs when in mono modes
•
Insert connectors for outboard equipment
(in mono modes)
•
Post- and Pre-EQ Output Feeds (in mono mode)
•
DC, overload, and thermal protection circuits
•
Clip detection and limiting circuits for speaker
protection
•
Power-saving Sleep Mode for intermittent use
applications
•
Signal, Clip, Sleep Mode, and Protect indicators
•
Back-Slope AC voltage stabilization for depend-
able performance over varying AC line voltages
•
Heavy 14-gauge steel chassis with cast
aluminum front panel
•
Recessed volume control knobs with snap-on,
protective cover
•
Mounts in 2 rack spaces (3-1/2") directly stack-
able without need for extra space above or below
•
2 independent, continuously variable, cooling
fans for dependable and quiet operation
•
Easily removable front fan grilles
•
Stable into 2-ohm loads
Back-Slope™ AC Voltage Stabilization
Bogen’s patented Back-Slope circuitry assures consistent performance and reliability by regulating the proper amount of
AC energy from the amplifier’s power toroid, as AC line voltages rise and fall (up to 10%), thus maintaining maximum
performance. This also prevents damage to the amplifier over varying line voltages and load conditions.
Sleep Mode
Energy-saving Sleep Mode feature reduces amplifier power consumption during idle periods. When a signal is absent
for more than three minutes, the unit will go into sleep mode. During sleep mode, the unit draws less power.
Instant-on wake operation automatically returns the unit to full power when an audio signal is detected, without
cutting off the beginning of the signal. (Sleep mode is defeatable.)
Input Options & Priorities
M-Class amplifiers support up to two input modules with up to two priority settings. Either module can be set as a
higher priority, making the other module the lower priority. Both module inputs can be mixed together. Each amplifier
comes standard with a professional-quality, stereo, high-impedance balanced input module. Other modules can be
added as needed.
Back-Slope provides these advantages:
•
the output voltage of the amplifier is better
controlled when the unit is lightly loaded
•
ensures better low-frequency performance into
step-down transformers
•
prevents component damage to the amplifier if
the power line voltage goes above its nominal
value and improves the reliability of the unit
•
regulates the rail voltage of the amplifier efficiently
with minimal wasted heat
TELEPHONE INPUT - TEL1S
Interfaces to Telephone System's Loop Start/Ground Start Trunks
or Paging Ports
•
Loop start or ground start trunk interfacing
•
Dry loop interface to paging ports
•
Audio-activated paging in dry loop
•
Gain/Trim control; Noise gate & Limiter
•
Mutes lower priority modules
•
Mutable by higher priority modules
•
Bus assignable & Transformer-isolated
•
Screw terminal connections
BRIDGING INPUT - BRG1R
Daisy Chain Multiple Amplifier Inputs
•
Gain/Trim control
•
Ground isolated input to eliminate ground loop
•
Input signal available at buffered output
•
Priority assignable
•
Variable ducking level when muted
•
Fade back from mute
•
Buffered output not muted
•
Bus assignable
•
RCA input and output connector
MONO AUX INPUT - MAX1R
Unbalanced Mono Input
•
Gain/Trim control
•
Bass & Treble controls
•
Gate feature mutes lower priority modules
•
Mutable by higher priority modules
•
Variable ducking level when muted
•
Fade back from mute
•
Bus assignable
•
RCA connector
BALANCED INPUT - BAL2S
Stereo, Balanced Input
•
Stereo, high-impedance, electronically balanced inputs
•
Professional-quality, low noise performance
•
Selectable gain of 0 or 18 dB
•
Compatible with telephone system page ports
•
Mutable by higher priority modules
•
Variable ducking level when muted
•
Fade back from mute
•
Screw terminal connections
STEREO AUX INPUT - SAX1R
Unbalanced Stereo Input
•
Gain/Trim control
•
Bass & Treble controls
•
Gate feature mutes lower priority modules
•
Mutable by higher priority modules
•
Variable ducking level when muted
•
Fade back from mute
•
Stereo-to-mono summing option
•
Bus assignable
•
RCA connectors
MICROPHONE INPUTS - MIC2S, MIC2X
Low-impedance, Electronic-balanced Microphone Inputs
•
Gain/Trim control
•
High Cut/Low Cut controls
•
Enhance control
•
Noise gate w/Threshold control
•
Limiter w/Threshold control
•
24V Phantom power
•
Priority & Bus assignable
•
Screw terminals
(MIC2S)
;
XLR connector
(MIC2X)
MICROPHONE INPUTS - MIC1S, MIC1X
Low-impedance, Transformer-balanced Microphone Inputs
•
Gain/Trim control
•
Bass & Treble controls
•
Noise gate w/Threshold
& Duration control
•
Limiter w/Threshold control
•
24V Phantom power
•
Priority & Bus assignable
•
Balanced, transformer-isolated
•
Screw terminals
(MIC1S)
;
XLR connector
(MIC1X)
TRANSFORMER-BALANCED INPUT - TBL1S
Transformer-Balanced AUX Input
•
Gain/Trim control
•
Bass & Treble controls
•
Transformer-isolated, dual-impedance, line-level input
•
Variable ducking level when muted
•
Mute send & receive
•
Fade back from mute
•
Mute send threshold & duration adjustments
•
Priority & Bus assignable
•
Pluggable screw terminal connections
TONE GENERATOR - TNG1S
Multiple Tone Generator Input
•
Level control
•
Select 4 of 8 tones to trigger
•
Burst/steady, slow whoop, siren, mechanical bell,
Klaxon, night ringer, double chime, & doorbell tones
•
Momentary & continuous playback modes
•
Microprocessor-controlled
•
Priority assignable
•
Mute send & receive
•
Screw terminal trigger connections
LINE/MIC INPUTS - LMM1S, LMR1S
Actively Balanced Emulated Transformer Inputs
•
Input level controlled
by remote panel or direct
voltage
(LMR1S)
•
Wall Plate Control included
(with LMR1S only)
•
Limiter with LED activity
indicator (LMR1S)
•
Line/MIC gain switch
•
Gain/Trim control
•
Bass & Treble controls
•
Noise gate w/threshold control
•
Fade back from mute
•
24V phantom power
•
Priority & bus assignments
•
Screw terminal input
•
Mutes lower priority modules
•
Mutable by higher priority
modules
Accessories
PRS48
48V DC
Power
Supply
LMM1S
(Same as LMR1S,
without Remote
Volume capability)
MIC1S
MIC1X
MIC2S
MIC2X
LMR1S
with Remote
Volume Control
Each amplifier can accept up to two Bogen input modules, with user-settable priority levels.
Plug-in modules support different signal processing options including the ability to interface
to balanced and unbalanced high- and low-level inputs, stereo or mono, telephone PBXs, and microphones. A stereo, balanced, high-
impedance, input module (BAL2S) comes standard with each amplifier. Other modules offer more advanced functionality.
Input Modules
RELAY INPUT/OUTPUT - RIO1S
•
Transformer-isolated, balanced line-level input
•
600-ohm or 10k jumper selectable input impedance
•
8-ohm, 750mW Mix Bus output
•
Input and output level controls
•
Relay contacts respond to selectable priority level
•
N.O. or N.C. relay contacts
•
External control of priority muting
•
Input can be muted from higher priority modules,
with signal fade back
