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Parasound Halo A 31

3-channel power amplifier

Item # 313A31B

It delivers plenty of clean power for the front left, right, and center speakers in your home theater system.

It delivers plenty of clean power for the front left, right, and center speakers in your home theater system.

New

Item # 313A31B

Ships free

Ship date unknown

$3,495.00

About the Parasound Halo A 31

Plenty of power for your front speakers

The front left, right, and center speakers do most of the heavy lifting in your sourround sound system, and Parasound's Halo A 31 three-channel power amp has the juice to drive them very well. This 65-pound dynamo delivers 250 watts per channel with all three channels driven, and it's stable at very low impedances, so it's compatible with a very wide range of speakers. With its sheer power — and thoughtful circuit design courtesy of Parasound's audio guru John Curl — this amplifier delivers impressive volume, clarity, and dynamics with your surround sound speaker system.

Plenty of power for your front speakers

The front left, right, and center speakers do most of the heavy lifting in your sourround sound system, and Parasound's Halo A 31 three-channel power amp has the juice to drive them very well. This 65-pound dynamo delivers 250 watts per channel with all three channels driven, and it's stable at very low impedances, so it's compatible with a very wide range of speakers. With its sheer power — and thoughtful circuit design courtesy of Parasound's audio guru John Curl — this amplifier delivers impressive volume, clarity, and dynamics with your surround sound speaker system.

Each channel features an unbalanced RCA and a balanced XLR input, with individual gain knobs with a -6/+6dB attenuation range. The amp offers three power-up options: manual, signal-sensing, and 12-volt trigger.

Class A/AB operation for smoother sound

The A 31 uses a Class A/AB power circuit. You don't see an amplifier described that way every day, so let's break down the benefits.

Engineers and audiophiles generally agree that Class A designs offer the purest sound, but they tend to run hot and take up a lot of space. As a result, home audio amplifiers often use a compromise known as Class AB, which hands off part of the audio signal to a different set of output transistors at high power levels. AB can sacrifice a bit of signal purity, but it lets the amp run cooler and more efficiently.

So this Class A/AB amp operates in pure Class A mode up to a higher power level than most other amplifiers in its price category, before the second set of transistors kick in. The result is a sound that's smoother, less fatiguing, and more natural.

The legacy of John Curl

The A 31 features circuitry designed by John Curl, a legend in audio engineering. He started his career in the 1970s, designing tape and video recorders at Ampex, and he had a hand in building the Grateful Dead's famous Wall of Sound. Curl has worked with Parasound since 1989, designing all of their high-power amplifiers and more. The power supply, transistors, capacitors and other parts in the A 31 were chosen to offer high performance at a reasonable price.

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Product highlights:

  • 250 watts per channel into 8 ohms (20-20,000 Hz) at 0.2% THD with 3 channels driven
  • 400 watts x 2 into 4 ohms
  • designed by legendary audio engineer John Curl
  • THX Ultra2 certified for reference home theater sound
  • high-bias Class A/AB amplifier design
  • large toroidal transformer
  • frequency response: 5-100,000 Hz (-3dB)
  • signal-to-noise ratio: 112 dB
  • handles very low impedances for use with virtually any speakers
  • three balanced XLR and three unbalanced RCA inputs
    • individual gain control for each channel (-6/+6dB range)
  • heavy-duty gold-plated 5-way speaker terminals
  • switchable turn-on options: manual, signal sensing, or 12-volt trigger
  • detachable power cord
  • rack mounting ears included
Dimensions and warranty:

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