Parasound HALO A51 5-channel power Amp
Bring the Cinematic Experience Home
Add the A51 to your home theater and watch—or listen—everything transform. This five‑channel amp effortlessly boosts your AVR, powering your front and surrounds with clean, room-filling performance that punches well above its price.
Designed by John Curl, the A51 runs high‑bias Class A/AB in a direct‑coupled topology for maximum clarity. It delivers 250 W x5 into 8 Ω (400 W x5 into 4 Ω) with THX Ultra2 certification, fed by a 2.2 kVA toroidal transformer and 164,000 µF of filter capacitance for clean current on demand. Balanced XLR and RCA inputs make it a drop‑in upgrade for any AVR/processor with pre‑outs.
Praised by audiophiles and reviewers alike:
- “Midrange was totally seductive…with music, the A51 radiated sweetness and light. With action films, it rained thunder and lightning.”Sound & Vision (Barry Willis)
- “Benchmark levels of performance at a reasonable price.”Home Theater Review
- “More than capable of driving any speaker load…a true winner!”Audioholics
Covered by Parasound's 3-Year Parts & Labor Warranty. Terms effective September 1, 2026.
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Specifications
- Power Output - All Channels Driven
- 250 watts RMS x 5, continuous, 20 Hz - 20 kHz 8Ω 400 watts RMS x 5, continuous, 20 Hz - 20 kHz, 4Ω
- 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/µsecond
- 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 Lev
- 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
- Voltage
- 110V - 120V
- Dimensions
- 17-1/2" w x 7-5/8" h x 20" d, 7" h without feet
- Net weight
- 80 lb
Manufacturer's Description — Parasound
Bring the Cinematic Experience Home
Add the A51 to your home theater and watch—or listen—everything transform. This five‑channel amp effortlessly boosts your AVR, powering your front and surrounds with clean, room-filling performance that punches well above its price.
Designed by John Curl, the A51 runs high‑bias Class A/AB in a direct‑coupled topology for maximum clarity. It delivers 250 W x5 into 8 Ω (400 W x5 into 4 Ω) with THX Ultra2 certification, fed by a 2.2 kVA toroidal transformer and 164,000 µF of filter capacitance for clean current on demand. Balanced XLR and RCA inputs make it a drop‑in upgrade for any AVR/processor with pre‑outs.
Praised by audiophiles and reviewers alike:
- “Midrange was totally seductive…with music, the A51 radiated sweetness and light. With action films, it rained thunder and lightning.”Sound & Vision (Barry Willis)
- “Benchmark levels of performance at a reasonable price.”Home Theater Review
- “More than capable of driving any speaker load…a true winner!”Audioholics
Covered by Parasound's 3-Year Parts & Labor Warranty. Terms effective September 1, 2026.
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Authorized dealers for Parasound HALO A51 5-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