Martin Audio MA4.2s Technical Specifications

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

Martin Audio MA4.2s Specifications

Power Output

max output power at 8 ohms per channel	1300 W
max output power at 4 ohms per channel	2300 W
max output power at 2 ohms per channel	2900 W
max output power at 8 ohms bridged	4600 W
max output power at 4 ohms bridged	5800 W

Voltage

max output voltage at 8 ohms load	102 Vrms
peak voltage, no load	145 V
operation voltage	130-270 V
full output power	180-260 V
min start voltage	175 V

Current

peak inrush current	5 A
quiescent power no load	0.6 A rms
1/8 of full power at 4 ohms/230V	6 A rms
1/3 of full power at 4 ohms/230V	14 A rms
at full power at 4 ohms/230V	26 A rms

Weight and Dimensions

width	483 mm
height	88 mm
depth	393 mm
weight	10 kg