Parasound HALO A31 Power Amp

Parasound HALO A31 Power Amplifier

The Parasound HALO A31 Power Amplifier delivers exceptional three-channel power and control for the most demanding home theater or music systems.

The Parasound HALO A31 is a high-current, three-channel Class A/AB amplifier designed by legendary engineer John Curl. It produces 250 watts per channel into 8 ohms and 400 watts per channel into 4 ohms, with all three channels driven. This powerhouse is ideal for front left, center, and right channels in high-end surround setups, or as a reference-grade foundation for music-based systems requiring superb channel separation and dynamic range.

With high-bias Class A operation for the first watts, the Parasound HALO A31 delivers the warmth and detail of pure Class A with the headroom and efficiency of Class AB for full dynamic control. Its fully discrete circuitry, dual mono design, and massive toroidal transformer ensure low noise, clean signal transfer, and commanding presence at any volume.

The Parasound HALO A31 features both balanced XLR and unbalanced RCA inputs, adjustable channel gain, trigger input, and loop outputs, allowing flexible system integration. A rock-solid build and fanless operation ensure silent performance and long-term reliability in even the most refined home theater environments.

In Stock. For assistance or product questions, call 443-402-5055 or text 443-402-5064 to reach our team. All Elite Audio is an authorized Maryland dealer and operates a full home audio showroom.

Key Specifications
Power Output (All Channels Driven): 250 W × 3 @ 8 ohms
Power Output (All Channels Driven): 400 W × 3 @ 4 ohms
Class A/AB Operation: High bias, first watts in Class A
Frequency Response: 5 Hz – 100 kHz (+0 / -3 dB)
THD: < 0.2% at full power
Signal-to-Noise Ratio: > 112 dB (A-weighted)
Input Options: Balanced XLR / Unbalanced RCA
Gain Adjustment: Up to +6 dB over THX reference
Damping Factor: > 1100 @ 20 Hz
Current Capacity: 60 A peak per channel
Power Supply: 1.5 kVA toroidal transformer
Dimensions (W × H × D): 17.25" × 7.6" × 19.1"
Weight: 65 lbs
Finish: Black or Silver

Top 20 Questions About Parasound HALO A31 Power Amplifier

What is the output power of the Parasound HALO A31 Power Amplifier?
The HALO A31 delivers 250 watts per channel into 8 ohms and 400 watts per channel into 4 ohms with all three channels driven.

Is the Parasound HALO A31 suitable for powering demanding speakers?
Yes. With 60 amps of peak current per channel and a high damping factor, it controls even the toughest loads.

Who designed the Parasound HALO A31 Power Amplifier?
It was designed by renowned audio engineer John Curl, known for his high-performance amplifier designs.

What type of amplification does the Parasound HALO A31 use?
It uses a high-bias Class A/AB topology, running the first watts in pure Class A for refined musicality.

Is the Parasound HALO A31 a good choice for home theater?
Yes. It’s ideal for driving the left, center, and right channels in a high-end home theater system.

Does the Parasound HALO A31 include balanced inputs?
Yes. It includes both balanced XLR and unbalanced RCA inputs with switches per channel.

Can the Parasound HALO A31 Power Amplifier be rack-mounted?
Yes. It includes handles and optional rack-mount hardware for professional installations.

Does the Parasound HALO A31 run hot or require ventilation?
It runs warm due to high-bias Class A operation, so adequate ventilation is recommended, but it operates silently with no fan.

What is the signal-to-noise ratio of the Parasound HALO A31 Power Amplifier?
The S/N ratio exceeds 112 dB, ensuring ultra-quiet operation and clean sound reproduction.

Can the Parasound HALO A31 be bridged or used in mono?
It is designed for three-channel operation and is not intended for bridged use.

What is the damping factor of the Parasound HALO A31 Power Amplifier?
The damping factor is greater than 1100 at 20 Hz, allowing precise bass control.

Does the Parasound HALO A31 have gain controls?
Yes. Each channel features adjustable gain, up to +6 dB over THX reference level.

What kind of protection circuitry does the Parasound HALO A31 include?
It includes DC offset, short-circuit, and thermal protection for reliable long-term operation.

How large is the Parasound HALO A31 Power Amplifier?
It measures 17.25 inches wide, 7.6 inches high, and 19.1 inches deep.

What is the weight of the Parasound HALO A31?
The amplifier weighs approximately 65 pounds.

How does the Parasound HALO A31 compare to the HALO A21+?
The HALO A31 offers the same sonic performance but adds a third identical channel for LCR theater or multi-channel setups.

Can I use the Parasound HALO A31 in a stereo music system?
Yes. You can use two channels for stereo playback and reserve the third for a subwoofer or additional speaker zone.

What type of power supply does the Parasound HALO A31 use?
A 1.5 kVA toroidal transformer with massive energy reserves for consistent high-current output.

What finish options are available for the Parasound HALO A31 Power Amplifier?
It comes in black or silver, both with machined aluminum end caps and a solid chassis design.

Is the Parasound HALO A52+ a good match for AVR preamps?
Yes. It pairs perfectly with any brand AVR's that features pre outs for individual channels.

What is the Warranty for the Parasound HALO A31 Power Amplifier?
It includes a five-year parts and labor warranty from All Elite Audio.

How can I get help before buying the Parasound HALO A31?
For assistance or product questions, call 443-402-5055 or text 443-402-5064 to reach our team at All Elite Audio, your authorized Maryland dealer with a full home audio showroom.