Parasound Halo A 31 Three-Channel Power Amplifier

Parasound Halo A 31 Three-Channel Power Amplifier 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

Product Description:

Surround Sound Flexibility with Award‐Winning Performance  

The A 31 power amplifier has been developed to meet the growing demand for a robust three-channel amplifier that does not compromise on power or performance. Mirroring the performance and sound quality of the award-winning Halo A 51, the A 31 is versatile in its applications:

Ideal for powering the front three channels of a home theater system, it allows the surround or back channels to be driven by a smaller 2-channel Parasound power amp, like the Halo A 23. This configuration ensures that the most power is delivered to the front channels where it's most needed.

It can also be used to drive the center and two surround channels, leaving the left and right front speakers to be powered by a dedicated two-channel power amp such as the Halo A 21, or even better, two JC 1 monoblocks. This setup is perfect for audiophiles who do not want to compromise on stereo sound quality.

In an AV receiver-based system, the A 31 can power the front three channels, while the receiver drives the remaining surround and back channels. This guarantees superior sound quality for the front channels and allows the AVR to more effectively power the surround and back channels.

Regardless of how you choose to use the A 31, you'll be impressed by its impeccable sonic performance, commanding presence, and its ability to faithfully reproduce even the subtlest details.

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 channel 

Power bandwidth:
5 Hz - 100 kHz, +0/-3 dB at 1 watt

Total harmonic distortion:
< 0.2 % at full power

IM distortion: 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 balanced 

S/N ratio:
112 dB, input shorted, IHF A-weighted

Damping factor:
> 1100 at 20 Hz 

Dimensions:
17-1/2" w x 7-5/8" h x 20" d, 7" h without feet

Net weight: 65 lb.

Shipping weight: 79 lb.

Link to Manual