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Parasound Halo A 21+

Stereo power amplifier (Black)

Item # 313A21PB

This heavy hitter provides 300 watts per channel, and it's stable enough to drive virtually any speakers.

This heavy hitter provides 300 watts per channel, and it's stable enough to drive virtually any speakers.

New

Item # 313A21PB

Ships free

Ship date unknown

$2,995.00

Other options

About the Parasound Halo A 21+

This power amplifier is a heavy hitter

Parasound's 71-pound Halo A 21+ delivers a whopping 300 watts per channel, and it's stable enough to drive just about any speakers you might care to hook up. This amp is an improvement upon the company's original Halo A21, which was a popular choice among audiphiles during its own 15-year run. This newer "plus" version has a refined new look, and offers more power and improved specs almost across the board.

This power amplifier is a heavy hitter

Parasound's 71-pound Halo A 21+ delivers a whopping 300 watts per channel, and it's stable enough to drive just about any speakers you might care to hook up. This amp is an improvement upon the company's original Halo A21, which was a popular choice among audiphiles during its own 15-year run. This newer "plus" version has a refined new look, and offers more power and improved specs almost across the board.

Interior of Parasound Halo A 21+ amplifier

The large toroidal transformer inside Parasound's Halo A 21+ amplifier delivers a mighty 300 watts per channel of clean power.

In bridged mode, the A21+ really turns on the firehose, putting out an amazing 1,000 watts into a single channel. All that power comes from a beefy toroidal transformer and a high-bias Class A/AB amplifier design that help your system reproduce music with stunning clarity and accuracy.

Class A/AB operation for smoother sound

You don't see a Class A/AB amplifier 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.

Convenient connections

On the back panel are balanced XLR and unbalanced RCA inputs for each channel, and each has its own individual gain control knob and loop output. There are also binding posts for connecting a pair of speakers. The amp can be rack mounted using the included ears.

The legacy of John Curl

The A 21+ 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 21+ were chosen to offer high performance at a reasonable price.

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Product highlights:

  • 300 watts per channel into 8 ohms (20-20,000 Hz) at 0.1% THD with 2 channels driven
  • 500 watts x 2 into 4 ohms
  • 1,000 watts x 1 at 8 ohms in bridged mode
  • designed by legendary audio engineer John Curl
  • high-bias Class A/AB amplifier design
  • large custom toroidal transformer
  • frequency response: 5-100,000 Hz (-3dB)
  • signal-to-noise ratio: 115 dB
  • stable with speaker impedance dips down to 1.5 ohms
  • left and right balanced XLR and unbalanced RCA inputs
    • individual gain control for each channel
  • RCA loop outputs for each channel
    • let you daisy-chain additional amps
    • in bi-amp configuration, passes input signal from one channel to the other's RCA input
  • custom 5-way binding post speaker connectors
    • in bridged mode, only the positive binding posts are used
  • 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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