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HALO A31 3-Channel Power Amp
HALO A31 3-Channel Power Amp
HALO A31 3-Channel Power Amp
Parasound HALO A31 3-Channel Power Amp
Parasound

HALO A31 3-Channel Power Amp

Model AA31 · Series HALO

Three channels of 250W power to boost your home theater’s front stage. The A31 transforms weak receiver sound into full, rich, room-filling performance.

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At a glance

All specifications
Power
250 W per channel
Current capacity
60 amperes peak per channel
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
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Overview

Power You Can Feel

Drop the A31 into your system and everything locks in: voices stand center‑stage, low end digs deeper without bloat, and effects surge with head‑turning impact. It’s the missing muscle your movies and music have been asking for.

Designed by legendary audio engineer John Curl, it runs high‑bias Class A/AB (the first ~7 watts in pure Class A) with a direct‑coupled signal path for maximum clarity. A 1.5 kVA toroidal transformer and 98,400 µF of filter capacitance supply clean current on demand, while 250 W x3 into 8 Ω (400 W x3 into 4 Ω), balanced XLR and RCA inputs, and THX Ultra2 certification make integration straightforward in serious home theaters.

Praised by audiophiles and reviewers alike:

“Clear, detailed sound that belies its price…a joy to listen to.” — SoundStage! Access (Reviewers’ Choice)

“Impeccable in fit and finish…powerful but refined.” — Secrets of Home Theater & High Fidelity

Highlights

  • 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)
  • Complementary MOSFET driver stage and JFET input stage
  • 24 beta-matched 15 amp, 60 MHz bipolar output transistors
  • 1.5 kVA encapsulated toroid power transformer with independent secondary windings for each channel
  • 98,400 µF power supply filter capacitance
  • DC Servo and relay protection circuits
  • AC present, channel status, high temperature indicators
  • Heavy-duty 24k gold-plated 5-way speaker terminals
  • THX Ultra2 certified
  • Auto turn-on by 12v trigger or audio signal
  • 4u Chassis, carry handles, rack mounting adapter included

Specifications

Power
250 W per channel
How much power it delivers to each speaker into its rated load.
Model code
PARASOUND-HALO-A31-3-CHANNEL-POWER-AMP
Quote it when you ask a specialist.

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.

Downloads

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Awards and press

3

  • The Halo A 31 has a clear, detailed sound that belies its price, combined with just a touch of warmth. This blend of qualities made it a joy to listen to. Add to that its prodigious power output and rock-solid build quality, and I can assure you: It's the real deal.

    Soundstage Access April 2015

  • The Halo A 31 is a wonderful amplifier. By staying out of the way and letting me enjoy the music, the A 31 made this review a challenge to find new ways to say that it sounded wonderful. The Halo A 31 is able to drive any speaker you are going to throw at it and not complain, as well as impeccably built and beautiful in appearance.

    Secrets of Home Theater and High Fidelity

  • Remarkable definition…clean, luminous sound. Firm and extended bass. Running full range and full bore, I never lacked for power and weight.

    Stereophile September 2012

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