Parasound HALO A31 3-Channel Power Amp
The Parasound Halo A31 brings authoritative bass, cinema-scale dynamics, and a wide, sharply focused front stage to demanding LCR systems. Chris Heinonen found its control and detail unwavering under music and films, while Roger Kanno praised its blend of transparency, midrange richness, and smooth treble. This is high-current power delivered with rare refinement.
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Deliciously Crispy
Sound Quality
94/100
Build Quality
92/100
Value for Money
96/100
Pros
Delivers fast, tight bass and unwavering speaker control, even at demanding volumes.
Combines a large, precisely imaged soundstage with clear detail, midrange richness, and smooth, non-fatiguing treble.
Maintains stable, distortion-free dynamics across all three front channels at reference-level movie playback.
Cons
Front-panel indicator lights cannot be dimmed or disabled, which may distract in a dark theater room.
The binding posts look less premium than the rest of the exceptionally solid chassis.
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What Reviewers Are Saying
SOUND QUALITY PERFORMANCE 94/100
Reviewers found the A31 unusually complete-sounding: clear and spacious, yet slightly warm and richly textured rather than clinical. It combines controlled, high-impact power with a large, precisely organized soundstage and smooth treble that remains comfortable during extended listening.
Transparency Resolution
93/100
HomeTheaterHifi heard blacker backgrounds, more space around instruments, and better-defined notes, while SoundStage described excellent transparency that remained revealing without becoming fatiguing. Fine details reportedly stayed clear even within a large and energetic presentation.
Tonal Balance Musicality
92/100
The tonal character is consistently described as neutral-to-slightly-warm, with midrange richness, natural guitars and vocals, and a smooth, non-fatiguing treble. SoundStage found it both refined and inviting, while the HomeTheaterHifi reviewer praised its palpable vocal expression and smooth clarity.
Dynamics
95/100
This is a major strength. Reviewers repeatedly report exceptional grip, stable control at reference cinema levels, fast and tight bass, and no loss of composure with demanding music or effects; HomeTheaterHifi said it grabbed the speakers "by their throat and never let go."
Soundstage Imaging
94/100
The A31 was credited with a huge, wide, and deep front stage, with clearly separated instruments and voices anchored convincingly behind the speakers. SoundStage also noted precisely placed images that closely tracked onscreen drum placement, supporting its strengths in both music and cinema.
Assessments of Build Quality, Usability, and Overall Propositions.
Build Quality
92/100
Reviewers describe a very solidly built 65-pound amplifier with a substantial chassis, large heat sinks, rack-mount capability, and reliable cool-running behavior under hard use. The front-panel end pieces are said to appear plastic, but SoundStage felt they did not undermine the overall impression of excellent construction.
Value for Money
96/100
At its $4,000 asking price, SoundStage called the Halo range reference-quality sound for budget prices and judged the A31 among today's best values in power amplification, possibly the best. Its combination of three high-power channels, refined musical performance, and serious speaker control was viewed as unusually compelling against peers.
Reviews & Sources
Professional reviews and sources for this product's Watt'n Potatoes analysis.
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Specifications
- Continuous power output
- 250 watts RMS x 3, 20 Hz - 20 kHz, 8 Ω, all channels driven 400 watts RMS x 3, 20 Hz - 20 kHz, 4 Ω, all channels driven
- Current capacity
- 60 amperes peak per channel
- Power bandwidth
- 5 Hz - 100 kHz, +0/-3 dB at 1 watt
- Total harmonic distortion
- < 0.2 % at full power
- IM distortion
- < 0.04 %
- Slew rate
- > 130 V/μs
- Dynamic headroom
- > 1.5 dB
- Interchannel crosstalk
- > 78 dB at 1 kHz; > 63 dB at 20 kHz
- Input sensitivity
- 1 V for 28.28 V (THX Reference)
- Input impedance
- 47 k Ω unbalanced; 94 k Ω balanced
- S/N ratio
- 112 dB, input shorted, IHF A-weighted
- Damping factor
- > 1100 at 20 Hz
- Dimensions
- 17-1/2" w x 7-5/8" h x 20" d, 7" h without feet
- Net weight
- 65 lb.
- Shipping weight
- 79 lb.
Manufacturer's Description — Parasound
Power You Can Feel
Drop the A31 into your system and everything locks in: voices stand center‑stage, low end digs deeper without bloat, and effects surge with head‑turning impact. It’s the missing muscle your movies and music have been asking for.
Designed by legendary audio engineer John Curl, it runs high‑bias Class A/AB (the first ~7 watts in pure Class A) with a direct‑coupled signal path for maximum clarity. A 1.5 kVA toroidal transformer and 98,400 µF of filter capacitance supply clean current on demand, while 250 W x3 into 8 Ω (400 W x3 into 4 Ω)balanced XLR and RCA inputs, and THX Ultra2 certification make integration straightforward in serious home theaters.
Praised by audiophiles and reviewers alike:
- “Clear, detailed sound that belies its price…a joy to listen to.”SoundStage! Access (Reviewers’ Choice)
- “Impeccable in fit and finish…powerful but refined.”Secrets of Home Theater & High Fidelity
Covered by Parasound's 3-Year Parts & Labor Warranty. Terms effective September 1, 2026.
Verified Dealers
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Authorized dealers for Parasound HALO A31 3-Channel Power Amp
- Abt Electronics — online and in-store — Glenview, Illinois, United States (website)
- Acoustic Sounds — online and in-store — Salina, Kansas, United States (website)
- All Elite Audio — online and in-store — Perry Hall, Maryland, United States (website)
- All That Audio — in-store — Anaheim, California, United States (website)
- Alpha High End — online and in-store — Brasschaat, Vlaams Gewest, Belgium (website)
- Alta Fedelta — online and in-store — Lombardia, Italy (website)
- Analogue Seduction — online and in-store — Whittlesey, England, United Kingdom (website)
- Anointed Soundz — in-store — Cedar Hill, Texas, United States (website)
- Area Hifi — online and in-store — L'Eixample, Comunidad Valenciana, Spain (website)
- Audible Images — in-store — Melbourne, Florida, United States (website)
and 86 more verified dealers