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MA Amplifier • Operating Manual
7
Specifications
General Power Amplifier Specifications
Amplifier Model
Maximum Output Power,
Watts per channel, all channels driven at rated load
Low Z output, per channel
2 Ohm
4 Ohm
8 Ohm
Low Z output, per bridged channel pair**
4 Ohm
8 Ohm
25V/70V/100V** output, per channel
25V
70V
100V
* With
Power Sharing
ON: The total available power across each group of four
channels is intelligently allocated based on signal and speaker load characteristics,
up to a maximum of 900W/ch on MA500 models, and 450W/ch on MA250 models.
** May require Class 3 speaker wiring, all others use Class 2 wiring. See section
Total Power Draw
- Watts, all channels driven, 1/8 power sinewave
Standby
Idle (no signal)
1/8 max power 2 Ohm
1/8 max power 4 Ohm
1/8 max power 8 Ohm
1/8 max power 25V
1/8 max power 70V
1/8 max power 100V
Total Current Draw
- in Amps, all channels driven, 1/8 power sinewave,
120VAC (divide by 2 for 240VAC)
Standby mode
Idle (no signal)
1/8 max power 2 Ohm
1/8 max power 4 Ohm
1/8 max power 8 Ohm
1/8 max power 25V
1/8 max power 70V
1/8 max power 100V
(0dBu = 0.775V rms)
MA500.8
MA500.4
MA250.8
(Power Sharing OFF*)
500
500
250
500
500
250
500
500
250
1000*
1000*
500*
1000*
1000*
500*
500
500
250
500
500
250
500
500
250
20
10
20
110
55
110
740
375
435
680
340
390
660
335
390
790
380
425
660
335
385
650
330
380
0.4
0.2
0.4
1.08
0.55
1.08
6.3
3.2
3.7
5.8
2.9
3.35
5.65
2.85
3.35
6.75
3.25
3.65
5.65
2.8
3.35
5.6
2.8
3.3
Total Thermal Dissipation
MA250.4
driven, 120VAC
Amplifier Model
Standby mode
Idle (no signal)
250
1/8 max power 2 Ohm
250
1/8 max power 4 Ohm
250
1/8 max power 8 Ohm
1/8 max power 25V
500*
1/8 max power 70V
500*
1/8 max power 100V
Input Sensitivity
250
@26dB gain
250
250
@36dB gain
Audio Specifications
2.3
Signal to Noise Ratio, 26dB input sensitivity,
20Hz-20kHz, unweighted
10
Low-Z Mode
55
25V Mode
225
70V Mode
195
100V Mode
195
Distortion (SMPTE, typical)
205
Distortion (THD+N, typical, 8 Ohm,
190
10dB below rated power), 20Hz-20kHz
190
Frequency Response
Channel Separation
(dB from full output, 1kHz)
0.2
Damping Factor (8 Ohm load, <1kHz)
0.55
Input Impedance
1.95
Maximum Input Level
1.7
1.7
1.75
1.65
1.65
- in BTU/hour with typical input, all channels
MA500.8
MA500.4
MA250.8
76
44
65
209
105
184
818
426
631
614
307
477
546
290
477
989
443
597
546
290
460
512
272
443
- in Volts(rms) and dBu, per back panel Gain Switch
3.87V
3.87V
3.16V
(+14.0dBu)
(+14.0dBu)
(+12.2dBu)
1.22V
1.22V
1.00V
(+4dBu)
(+4dBu)
(+2.2dBu)
500W
Models
>108
>99
>108
>112
<0.5%
<0.2%
20Hz-20kHz, +/-0.05dB
-75dB
>250
10k Ohm
+21dBu
MA250.4
32
96
341
239
239
273
222
222
3.16V
(+12.2dBu)
1.00V
(+2.2dBu)
250W
Models
>105
>99
>108
>112
11
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