Designed to meet the increasing demand for a strong three-channel amplifier without compromising on power or sound quality, the A 31 power amplifier boasts the same outstanding performance as the award-winning Halo A 51. Its versatility allows for various applications, such as powering the front three channels of a home theater system while utilizing a smaller 2-channel Parasound power amp for the surround or back channels. This setup prioritizes delivering the most power to the front channels where it is most essential. Another option is powering the center and two surround channels while using a separate two-channel power amp, like the Halo A 21 or two JC 1 monoblocks, for the left and right front speakers. This configuration is especially ideal for audiophiles who want uncompromising stereo sound quality. In a system with an AV receiver, the A 31 can drive the front three channels while the receiver powers the remaining surround and back channels, ensuring superior sound quality for the front channels and allowing the AVR to effectively power the
 Key Features:
- 250 watts x 3 @ 8 Ohms / 400 watts x 3 @ 4 Ohms
- Adjustable gain for up to +6db over THX Reference level
- Unbalanced RCA and balanced XLR inputs
- Circuitry designed by legendary John Curl
- High bias class A/AB operation
- Direct coupled (no capacitors or inductors in signal path)
- THX Ultra2 certified
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Specifications:
Continuous power output:
250 watts RMS x 3, 20 Hz - 20 kHz, 8 Ω, all channels driven
400 watts RMS x 3, 20 Hz - 20 kHz, 4 Ω, all channels driven
Current capacity:
60 amperes peak per channelÂ
Power bandwidth:
5 Hz - 100 kHz, +0/-3 dB at 1 watt
Total harmonic distortion:
< 0.2 % at full power
IM distortion:Â balanced 16 V rms
< 0.04 %
Slew rate:
> 130 V/µsecond
Dynamic headroom:
> 1.5 dB
Interchannel crosstalk:
> 78 dB at 1 kHz;
> 63 dB at 20 kHz
Input sensitivity:
1 V for 28.28 V (THX Reference)
Input impedance:
47 k Ω unbalanced; 94 k Ω balancedÂ
S/N ratio:
112 dB, input shorted, IHF A-weighted
Damping factor:
> 1100 at 20 HzÂ
Dimensions:
17-1/2" w x 7-5/8" h x 20" d, 7" h without feet
Net weight:Â 65 lb.
Shipping weight:Â 79 lb.
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