Parasound A21+ 2 Channel Power Amplifier

The Parasound A21+ 2 Channel Power Amplifier is a flagship stereo amplifier from the Halo Series, engineered to deliver exceptional power, musical refinement, and uncompromising performance for the most demanding audiophile systems. Designed by renowned engineer John Curl, it combines high-bias Class A/AB operation, massive current capability, and a robust power supply architecture to provide outstanding control, transparency, and dynamic range. Built for serious two-channel listening and premium home theater applications, the A21+ delivers effortless authority while preserving the smallest musical details. With balanced connectivity, bridgeable operation, and the ability to drive demanding loudspeakers with confidence, it serves as the ideal foundation for reference-level stereo systems and high-performance entertainment environments. 

!
This product cannot be purchased online.
Please contact us for pricing and availability: (206) 462‑5227
Contact Us For Availability

The Parasound A21+ represents the pinnacle of Parasound's Halo Series stereo amplification, delivering reference-quality performance through a carefully engineered Class A/AB design. Its high-current architecture and oversized power supply allow it to produce deep, controlled bass, effortless dynamics, and exceptional detail while maintaining the smooth and natural presentation expected from a premium analog amplifier.

With 300 watts per channel into 8 ohms and 500 watts per channel into 4 ohms, the A21+ provides tremendous headroom for demanding loudspeakers and large listening environments. Its 60-amp peak current capability and robust output stage ensure precise speaker control, allowing complex musical passages and cinematic soundtracks to be reproduced with power, accuracy, and realism.

Designed for maximum system flexibility, the A21+ includes both balanced XLR and RCA inputs, making it compatible with a wide range of premium preamplifiers and processors. Its bridgeable design allows it to operate as a powerful mono amplifier when additional output is required, while its high-quality internal components and low-noise architecture maintain exceptional signal purity.

Combining legendary Parasound engineering, premium construction, and outstanding musical performance, the A21+ is an ideal choice for audiophiles seeking a true high-end power amplifier. Whether powering a dedicated stereo system or serving as the foundation of a premium home theater setup, it delivers the authority, refinement, and reliability required for an uncompromising listening experience.

  • Component type: Two-channel stereo power amplifier

  • Amplifier technology: High-bias Class A/AB operation

  • Power output: 300 W × 2 into 8 Ω, 500 W × 2 into 4 Ω

  • Bridged mode: 1,000 W × 1 into 8 Ω

  • Peak current capability: 60 amps per channel

  • Frequency response: 20 Hz – 20 kHz (+0/-0.25 dB), 5 Hz – 100 kHz (+0/-3 dB)

  • Total harmonic distortion (THD): <0.1% at full power, <0.03% at typical listening levels

  • Inputs: Balanced XLR and unbalanced RCA inputs



  • Signal-to-noise ratio: >115 dB (A-weighted)



  • Design features: Halo Series chassis, massive toroidal transformer, high-current output stage, 12 V trigger support, rack-mount capability, and premium-grade components