Crest Audio Stereo Amplifier - Manual (Page 30)

Appendix D Crest Audio Pro Series Power Amplifiers
The Crest Audio Models MA5850, MA9130, and MA7120 Professional power amplifiers are specifically designed in close coopera-
tion with Meyer Sound Laboratories to meet the needs of the European Meyer Sound loudspeaker user. This manual describes all of
the important aspects of amplifier installation, mounting, connection and operation. Additional information pertaining to these power
amplifiers is provided in this appendix.
MA5850 - Based on the Crest Audio Professional Series 4801 power amplifier, the MA5850 contains custom circuitry to limit output
to 58V RMS per channel, effectively preventing driver over-excursion on the models for which it is intended. As the power supply of
the MA5850 is capable of much greater output, this design also reduces possible damage from clipped waveforms. The MA5850 is
specifically designed as a Meyer Type 1 power amplifier. The gain setting is 23 dB at Meyer’s recommendation.
MA9130 - The MA9130 is based on the Crest Audio Professional Series 8001 power amplifier, using a custom designed, low noise
two speed fan and custom circuitry for operation as a Meyer Type 2 Power Amplifier. The MA9130 gain setting is also 23 dB.
MA7120 - The MA7120, based on the Crest Audio Professional Series 6001 and 7001 power amplifiers, is intended for bridged mode
operation, with a voltage gain of 6.3 (+16 dB). It has been specifically designed to meet the high power requirements of a Meyer Type
3 power amplifier.
Warranty applicable in USA, Canada, U.K., and many other countries. Power figures are watts per channel, both channels driven. Crest Audio reserves the right to make improvements in manufacturing or design which may
affect specifications. Crest Audio specification literature is available in downloadable PDF file format; visit our website at http://www/crestaudio.com. ©1996 Crest Audio Inc.
Appendix D
Meyer-Compatible Power Amplifiers
1kHz, <0.05% THD+N 20Hz-20kHz, <0.1% THD+N
400W 300W
575W 480W
1150W 960W
58V
82V
20 Hz-20 kHz, -3dB @ 53kHz
20 Hz-20 kHz, +0/-0.2dB
Clip Limit, IGM, AutoRamp, High Temp, short-circuit,
DC voltage, turn-on/off transient, sub/ultrasonic input.
<0.05%
<0.015%
400:1
>60 dB
3.5V RMS
X14 (+23dB)
>20k Ω
>-100 dB
>-60dB
H
Female XLR (pin 3+), Octal Socket
5-way output binding posts
80,000 µF
100V–240V, 50–60Hz
.55A
2.8A
5.75A
10.0A
1803 BTU/hr
3385 BTU/hr
Rear to front tunnel heatsink, variable speed DC fan
Front panel: 2 attenuators, circuit breaker/power switch;
Rear panel: mode switch, signal ground lift jumper.
Clip/Limit, Signal, Temp/DC, Active
16 ga. single piece steel chassis, .187" (5mm) alum. front panel
3.5"x19"x15" (16" to rear ears)
89mm x 483mm x 381mm (406mm to rear ears)
54.0 lbs (24.52 kg.), 49.0 lbs (22.25 kg.)
5 years, parts and labor†
8 Ω Stereo Power
4 Ω Stereo Power
8 Ω Bridged Mono Power
Max RMS Output Voltage (each channel)
Peak Output Voltage (each channel)
Frequency Response (+0 / -0.3dB, 1W/8 Ω )
Power Bandwidth (rated power at 4 Ω , 1% THD+N)
Protection Circuitry
THD+N (rated power at 8 Ω , 1kHz)
SMPTE IMD (rated power at 8 Ω , 60Hz & 7kHz)
Damping Factor (10-400Hz at 8 Ω )
Input CMRR (1kHz)
Input Sensitivity (rated power at 4 Ω )
Voltage Gain
Input Impedance (balanced)
Hum and Noise (“A” weighted, full power, 4 Ω )
Crosstalk (“A” weighted, full power, 4 Ω )
Class
Input Connectors (per channel)
Output Connectors (per channel)
Filter Storage
Power Supply (factory configured)
Idle Current Draw (240V)
1/8 Power Curr. Draw (typical music, 120V/4 Ω )
1/3 Power Curr. Draw (continuous music, 120V/4 Ω )
Max Curr. Draw (circuit breaker rating, 120V/4 Ω )
Thermal Emissions (1/8 Power, 4 Ω )
Thermal Emissions (1/3 Power, 4 Ω )
Cooling
Controls
LED Indicators (per channel)
Construction
Dimensions (Height x Width x Depth)
Gross Weight, Net Weight
Warranty
† USA, Canada, U.K., and many other countries. Power figures are watts per channel, both channels driven. Crest Audio reserves the right to
make improvements in manufacturing or design which may affect specifications. Crest Audio specification literature is available in down-
MA5850