Parasound Halo A21+ Power Amplifier
#2 in Stereo Amplifiers · Rated 4.7
High-current Halo power amp for two-channel systems
Parasound’s Halo A21+ is a front‑end powerhouse designed for two‑channel listening and high‑impact stereo playback. It delivers 300 watts per channel into 8 ohms and 500 watts into 4 ohms, with 1,000 watts bridged for mono use. The A21+ uses a robust toroidal transformer and high‑quality filter capacitors to sustain clean, dynamic power into demanding loudspeakers. It is renowned for bass control, spacious soundstage, and low distortion at high output, making it a strong value in the premium category. The A21+ has earned multiple awards and is well supported internationally, including strong dealer networks in the US and beyond. This model also emphasizes ease of integration with preamps and home theater rigs via balanced XLR and RCA inputs, plus 12V trigger and IR/RS-232 ready options. Sources: Parasound A21+ specifications, award notes, and dealer listings. ([parasound.com](https://parasound.com/products/a21?srsltid=AfmBOop3AWEsjCqUrp3Fhs77DGpX0amS4zH9E5PuzKj7w1lQ9cCCt-nA))
Features
- 300W per channel (8Ω), 500W (4Ω), 1000W bridged
- Balanced XLR and RCA inputs; 2Ω stability
- Automatic turn-on via 12V trigger
- Conservative protection and solid build
- Home theater/pass-through integration options
Pros
- Impressive power for a two-channel amp
- Strong bass control and musicality
- Good value with premium features
Cons
- Heavier mass (about 71 lb) may require careful placement
- Pricing at top‑tier market levels