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Parasound Halo A 21+

Halo series · Discontinued

The Parasound Halo A 21+ is a 2-channel power amplifier rated 300 W per channel into 8 Ω, for speakers down to 2 Ω. It has no volume control or decoding, so it goes after a receiver or processor with pre-outs.

Channels
2
Amplified
Power
300 W
Per channel, 8 Ω
Power at 4 Ω
500 W
Per channel
Lowest speaker load
2 Ω
As rated

$5,000 each (MSRP, September 2026)

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3D model of the Parasound Halo A 21+

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Which speakers work with it?

What decides it is the speaker's impedance, in ohms (Ω) on its spec sheet. The Halo A 21+ is rated for speakers down to 2 Ω.

  • Works

    Speakers rated 4–8 Ω

    98 in our catalogue

In its price range

All 98 speakers we checked

Works98

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Halo A 21+ specifications

Channels
2
Power
300 W at 8 Ω
Lowest impedance
2 Ω
Inputs
RCA, XLR
Size
18×8×20 in
Power at 4 Ω
500 W
Weight
32.2 kg (71 lb)
MSRP
$5,000 each (MSRP, September 2026)

Every value comes from the sources under References, last retrieved September 15, 2026.

Questions about the Halo A 21+

How many watts per channel is the Halo A 21+?
300 W per channel into 8 Ω (500 W into 4 Ω), with 2 channels driven, across 2 channels.
Can the Halo A 21+ drive 4 ohm speakers?
Yes. It is rated for loads down to 2 Ω.
Do I need a receiver with the Halo A 21+?
Yes. A power amplifier has no decoding or volume control of its own; connect it to the pre-outs of an AV receiver or processor.
What inputs does the Halo A 21+ have?
Unbalanced RCA and balanced XLR.
How big is the Halo A 21+?
The Parasound Halo A 21+ measures 448 × 197 × 508 mm (17.6 × 7.8 × 20 in, width × height × depth) and weighs 32.2 kg (71 lb).

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References

  1. Parasound Halo A 21+: Spec sheet, parasound.com, retrieved September 15, 2026
  2. Parasound Halo A 21+: Manufacturer product page, parasound.com, retrieved September 15, 2026

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