Data Sheet-2
MA 4
MULTICHANNEL AMPLIFIER
Specifications
Parameter
Specification
Conditions/Comments
Input impedance
10 kΩ
Each leg, differential, 1 kHz
Maximum input
+22 dBu
Sensitivity range/resolution
+22 to +4 dBu
256 steps
Remote level control range/resolution
Attenuate only; 0 dB to –80 dB
Audio taper response, 256 steps
Fault flag in/out
Active 5V high-side drive, passive pull down.
NO Fault = +5V; Fault = 0V
Limiter
Oversampled instantaneous attack
3 dB per second decay
..........Load compensated
Limit set for 7.5 amps peak
Based on load Z
Compressor
50 ms rms detector
Threshold relative to limiter
..........Threshold
10 dB re peak dBFS
Rear panel dipswitch on/off
..........Attack
1.5 second
..........Decay
3 dB per second
..........Knee Span
10 dB
Expander
Select on rear panel
rms detector
..........Threshold
-70 dBFS
..........Attack
50 ms
Gain reduction release time constant
..........Decay
10 dB per second
Rate of gain reduction
High-pass filter
12 dB per octave, Butterworth
20, 40, 60, 80 Hz dipswitch select
Load sensing
2 to 16Ω normal
Green Load indicator
on
..........Low load detect
Below 2Ω is low
Green Load indicator
flashing
..........High load detect
Above 16Ω is high
Green Load indicator
off
..........Min average power
3.3 watts average required for good load estimate
Output
..........Power
100 watts
3 to 8 Ω
..........Frequency response
20 Hz to 20 kHz
+0, -3 dB
..........Dynamic range
>90 dB
A-weighted, typical
..........THD+N
0.1% typ
100 watts into 4Ω, 20-20 kHz
..........Clock fundamental
310 kHz
<10 mV residual
..........Relay switching
Turn on mute, fault protection, redundancy switching
Fan cooling
Temperature controlled, variable speed
Intake left side, exhaust right side
Heat load in Btu/hr
100 / 240 volts AC 50/60 Hz
..........Standby
10.2 / 13.3
..........Run mode, no signal
112.3 / 95.5
..........All channels driven
167 / 139
pink noise, average ⅛
th
power, 4:1 crest
AC Mains
100 to 240 VAC
±10%, 50 or 60 Hz
PFC
100 kHz boost
DC/DC
200 kHz forward
Unit: Conformity
FCC, CULUS
..........Construction
All Steel
..........Size
1.75"H x 19"W x 9.25"D
(4.4 cm x 48.3 cm x 23.5 cm)
..........Weight:
8 lb
(3.6 kg)
Shipping: Size
4.5" x 20.3" x 13.75"
(11.5 cm x 52 cm x 35 cm)
..........Weight:
11 lb
(5 kg)
All specifications typical unless otherwise noted.
