DC and VHF Protection
Both DC voltages and high power VHF signals can cause damage to loudspeakers.
The MA4.2 amplifier incorporates protection circuits which are activated when
damaging DC voltages or VHF signals are present at the outputs.
MA4.2 Specifications
Input Impedance 20kohms (balanced) 10kohms single ended
Gain select switch 41dB (I/P sens 0.775V), 32dB (I/P sens 2.26V)
CMRR at 1KHz >50dB
Output impedance at 1KHz <0.06 ohms
Power Bandwidth 5Hz - 20kHz
Slew rate 20V/us
Hum/Noise <-95dB
Channel Separation 1kHz > 80dB
10kHz > 70dB
Mains Operating Voltage 120 – 270 (minimum start voltage 190)
full output power maintained 180 – 280V
Optional (65 - 135V) operation.
Protection DC, High temperature, Turn on, VHF,
Over and under voltage, Clip limiters
AFS Short circuit
Distortion
THD 20Hz - 20kHz and 1W –
1000W
THD at 1 kHz and 2000W
DIM 30 at 500W
CCIF (13 and 14kHz) at 500W
SMPTE (60Hz and 7kHz) at 500W
4 ohms 0.1%
4 ohms 0.04%
4 ohms 0.04%
4 ohms 0.04%
4 ohms 0.04%
Power Matrix
LOAD CONFIGURATION
16 ohms Stereo (2 channel)
8 ohms Stereo (2 channel)
4 ohms Stereo (2 channel)
2 ohms Stereo (2 channel)
16 ohms Bridged mono
8 ohms Bridged mono
4 ohms Bridged mono
[1] = Component tolerance
dependent [2] = Continuous power,
one channel driven or peak power
both channels driven. Thermal
protection may occur at high
MLS SWITCH SETTING
(-5dB) (-4dB) (-2dB) (0dB)
220W 260W 410W 650W
430W 520W 820W 1300W
830W 1000W 1600W 2100W
1660W 2000W 2200W 2400W[1]
3050W[2] 3200W[2]
860W 1040W 1640W 2600W
1660W 2000W 3200W 4200W
3320W 4000W 4400W 4800W[1]
All material © 2007. Martin Audio Ltd. Subject to change without notice.
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