Parasound HALO A21+
Halo A21+ — Power You Can Feel, Control You'll Love The Parasound Halo A21+ delivers commanding power with effortless musicality. At 300 W per channel into 8 Ω (500 W into 4 Ω), and up to 1,000 W bridged, it drives any loudspeaker with authority while keeping the sound spacious, controlled, and fatigue-free. Based on legendary John Curl's circuit design, the A21+ refines Parasound's most celebrated power amp for today's systems—blending raw performance with elegant simplicity. Balanced XLR and RCA inputs, 2 Ω stability, and flexible bridging make it an ideal match for both stereo and home theater setups. Praised by audiophiles and reviewers alike:"The soundstage just bloomed. Bass is crisp… mids and highs are singing.""Ridiculously high damping… bass is tight and controlled at all volumes.""Delightful and satisfying from the first note… impossible to fault." Winner of multiple awards and recommendations, including:Secrets of Home Theater & High Fidelity – Best Stereo Power Amplifier (2024)Stereophile – Recommended ComponentFuture Audiophile – "Best Affordable Audiophile Power Amp" Covered by Parasound's 3-Year Parts & Labor Warranty. Terms effective September 1, 2026.
| Brand | Parasound |
| Model | HALO A21+ |
| Channels | 2 |
| Power per channel, 8 Ω (W) | 300 |
| Power rated from (Hz) | |
| Power rated to (Hz) | |
| Power rated at THD (%) | 0.1 |
| Power rated with channels driven | 2 |
| Power per channel, 4 Ω (W) | 500 |
| Bridged power, 8 Ω (W) | 1000 |
| Frequency response | 5 Hz – 100000 Hz −3 dB; 20 Hz – 20000 Hz −0.25 dB |
| Total harmonic distortion (%) | 0.1 |
| Signal-to-noise ratio (dB) | 115 |
| Damping factor | 1100 |
| Input impedance (Ω) | 33000 |
| Gain (dB) | 29 |
| Height (mm) | 181 |
| Width (mm) | 448 |
| Depth (mm) | 508 |
| Weight (kg) | 32.2 |