Martin Audio Stereo Amplifier MA42s User Manual

MA4.2s  
Light weight, high performance power amplifier  
features  
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Switch mode power supply  
Superior sonic performance  
Light weight  
Advanced protection circuits  
Efficient copper cooling system  
Minimum load switches (MLS™)  
applications  
technical specifications  
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Live sound reinforcement  
Fixed installations  
MAX OUTPUT POWER  
EIA AT 1 kHz AND 1% THD  
MLS in 0dB position  
8 PER CHANNEL  
1300 W  
2300 W  
2900 W  
4600 W  
5800 W  
4 PER CHANNEL  
2 PER CHANNEL  
8 BRIDGED  
4 BRIDGED  
MAX OUTPUT VOLTAGE  
8LOAD  
The MA4.2s is one of a range of power amplifiers that have been  
designed to combine reliability and high power with sonic  
excellence. Utilising an advanced switch mode power supply, the  
amplifier is characterised by a very high power-to-weight ratio in  
a lightweight, 2U package. The innovative technology at the  
heart of the MA4.2s enables it to set new standards in terms of  
sonic accuracy, impact and clarity.  
102 Vrms  
145 V  
PEAK VOLTAGE, NO LOAD  
DISTORTION  
THD 20Hz – 20kHz AND 1 W TO FULL POWER 0.1%  
THD AT 1kHz AND –1dB UNDER CLIP  
DIM AT –3dB UNDER CLIP  
HUM AND NOISE  
CHANNEL SEPARATION @ 10kHz  
OUTPUT IMPEDANCE  
SLEW RATE  
0.04%  
0.04%  
<-105dB  
80dB  
60 mΩ  
20 V/µs  
INPUTS  
GAIN SELECTABLE (dB)  
IMPEDANCE  
COMMON MODE REJECTION  
FRONT PANEL  
GAIN CONTROLS  
INDICATORS: PROTECT  
INDICATORS: CLIP  
INDICATORS: SIGNAL PRESENT (-40dB)  
REAR PANEL  
20, 23, 26, 29, 32, 35, 38, 41  
10 kΩ  
50dB  
31 position detent  
Yellow LED  
Red LED  
Green LED  
INPUT CONNECTORS  
LINK CONNECTOR  
CLIP LIMITERS  
Neutrik Combo  
XLR-male  
On/off each channel  
0, -2, -4, -5dB  
CH. A-B  
MLS SWITCH  
LINK-SWITH  
POWER  
overall dimensions  
OPERATION VOLTAGE  
SOFT START  
130-270V  
Yes  
5 A  
180-260 V  
175 V  
Yes  
PEAK INRUSH CURRENT  
FULL OUTPUT POWER  
MIN START VOLTAGE  
115V OPTION  
CURRENT DRAW AT 4/230V  
QUIESCENT POWER (NO LOAD)  
1/8 OF FULL POWER (-9dB)  
1/3 OF FULL POWER (-5dB)  
AT FULL POWER (0dB) @ 1kHz 1%THD  
DIMENSIONS  
0.6 A rms  
6 A rms  
14 A rms  
26 A rms  
WIDTH  
483mm (19ins)  
88mm (3.5ins) 2U  
393mm (15.5ins)  
10kg (22lbs)  
HEIGHT  
DEPTH (incl. handles)  
WEIGHT  
Century Point, Halifax Road, Cressex Business Park,  
High Wycombe, Buckinghamshire HP12 3SL, England.  
Telephone: +44 (0)1494 535312 Facsimile: +44 (0)1494 438669  
All information is Copyright © 2003 Martin Audio Ltd.  
 

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