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Parasound Halo A 51

5-channel power amplifier

Key Features

  • Class A/AB circuitry designed by legendary John Curl
  • Direct-coupled – no capacitors or inductors in audio path ensures the cleanest signal
  • Balanced XLR inputs with discrete circuits
  • Full power is rated all the way down to 5Hz for unrestricted low-end bass

FEATURED REVIEW


CUSTOMER Q & A

question

Answers

Parasound's five-channel Halo A51 power amplifier combines raw power with an elegant circuit design. Designed by legendary audio guru John Curl in collaboration with CTC Builders, the Halo brings uncompromising audiophile performance to home theater. THX Ultra 2 certification ensures movie-house quality sonics, but the Halo surpasses this critical benchmark by delivering Parasound-quality sound derived from the ultra-high-end Parasound JC-1 400-watt mono amp. Matched JFET inputs, MOSFET drivers, and high-current bipolar outputs contribute to its exceptional performance.

  • "Instant" warm-up feature: Like all the other amps in the Halo product series, the A51 has Parasound's exclusive bias circuit, which permits the amplifier to sound perfect from the instant it's turned on, rather than having to wait for bias to gradually build up as the amp warms up over time. 
  • Run safely at peak performance: AC present, channel status, and high-temperature indicators team up with DC Servo and relay protection circuits to keep this powerhouse running safely at peak performance for years of reliable service. 
  • Goes beyond inner workings: One cannot overlook the visual statement the A51 makes in your rack. With its smooth silver casework and slightly curved façade, the A51 is nothing short of gorgeous and mates beautifully with the rest of the Halo line of products from Parasound.

Product Highlights

  • Class A/AB circuitry designed by legendary John Curl
  • Direct-coupled - no capacitors or inductors in audio path ensures the cleanest signal
  • Balanced XLR inputs with discrete circuits
  • Full power is rated all the way down to 5Hz for unrestricted low-end bass
  • Custom 1.5 kVA encapsulated toroid power transformer with independent secondary windings for each channel
  • Hand-matched JFETs for input stage
  • Hand-matched MOSFETs for driver stage
  • Beta-matched 15 amp, 60 MHz bipolar output transistors (3 pairs per channel)
  • 100,000 µF power supply filter capacitance
  • DC Servo and relay protection circuits
  • Auto turn on by audio signal or 12V trigger
  • Heavy-duty 24k gold-plated, 5-way speaker terminals
  • Power Output - All 5 Channels Driven: 180 watts x 5, 8 ohm; 255 watts x 5, 4 ohm
  • Power Output - 2 Channels Driven: 225 watts x 2, 8 ohm ; 350 watts x 2, 4 ohm
  • Power measurements parameters with 120VAC: 0.05% THD, RMS continuous power, full audio band (20 Hz - 20 kHz)
  • Current Capacity: 45 amperes peak, per channel
  • Dynamic Headroom: >1.5dB
  • Slew Rate: > 130 volts per microsecond
  • Frequency Response: 5 Hz - 100 kHz, +0/-3 dB; 20 Hz - 20 kHz, +0/-0.3 dB
  • Total Harmonic Distortion (THD): < 0.05 % at full power; < 0.03 % at typical listening levels
  • IM Distortion: < 0.04 %
  • TIM: Unmeasurable
  • Interchannel Crosstalk: > 78 dB at 1 kHz; > 63 dB at 20 kHz
  • Input Impedance: Unbalanced: 47 kohm ; Balanced: 94 kohm , 47 kohm per leg
  • Input Sensitivity for 28.28 V Output into 8 ohm : Unbalanced: 1 V; Balanced: 1 V per leg; Total Gain: 29 dB
  • S/N Ratio: > 112 dB, input shorted, IHF A-weighted; > 102 dB, input shorted, unweighted
  • Damping Factor: > 1100 at 20 Hz
  • Power Requirements: Standby: 1 Watt; Idle: 125 Watts; Maximum: 1500 Watts

Dimensions & Warranty

  • Dimensions Width: 17.25 W x 5.25" H x Depth: 20" D
  • Weight: 55 lbs
  • Our 30-day money-back guarantee

Additional information

Brand

Parasound

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