Parasound
Halo A 21+
The Halo A21+ is Parasound's high-current two-channel stereo power amplifier, designed by John Curl and Carl Thompson, running a high-bias Class A/AB output stage for Class-A-like sound at typical listening levels with substantial reserve power. Key specifications include Power output (8 Ω, both channels driven) of 300 W per channel and Power output (4 Ω, both channels driven) of 500 W per channel.
MSRP
$5,000
Used market · Excellent
$1,998
MSRP to used market
From $2,900 at launch to $1,998 today.
Specifications
- THD
- <0.1% at full power; <0.03% at typical listening levels
- Price
- $3,150 (Stereophile); ~$3,500 street
- Inputs
- balanced XLR and unbalanced RCA
- Outputs
- dual binding posts per channel, loop out
- Topology
- class A/AB high bias, direct-coupled, 60A peak current per channel
- Dimensions
- W: 17-5/8 in (448 mm); H: 7-1/8 in without feet (181 mm); D: 20 in (508 mm)
- Net weight
- 71 lb / 32.2 kg
- Power output
- 500 W per channel
- Damping factor
- >1100 at 20 Hz
- Amplifier design
- High-bias Class A/AB
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