Parasound Halo A51 5-Channel Power Amplifier
Halo A51 – 5-Channel Power Amplifier, 5 x 250watts, 8 ohm (Black Finish Only)
Add the A51 to your home theater and watch—or listen to—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. Circuitry designed by legendary John Curl, THX Ultra2 certified, High bias Class A/AB operation, Balanced inputs with discrete circuits and XLR connectors, Direct Coupled - no capacitors or inductors in signal path, Complementary MOSFET driver stage and JFET input stage, 40 beta-matched 15 amp, 60 MHz bipolar output transistors, 2.2 kVA encapsulated toroid power transformer with independent secondary windings for each channel, 164,000 μF power supply filter capacitance, DC Servo and relay protection circuits, AC present, channel status, high temperature indicators, Heavy-duty 24k gold-plated 5-way speaker terminals
Gold-plated RCA input jacks; ground lift switch, Auto turn-on by 12v trigger or audio signal, 4u Chassis, carry handles, rack mounting adapter included.
Specifications:
Frequency Response: 5 Hz - 100 kHz, +0/-3 dB at 1 watt.
Total Harmonic Distortion (THD): < 0.2 % at full power.
IM Distortion: <0.04%.
Input Impedance: Unbalanced - 47 kΩ, Balanced - 94 kΩ.
S/N Ratio: 112 dB, input shorted, IHF A-weighted.
Dimensions: Width: 17-1/2", Height without feet: 7", Height with feet: 7-5/8", Depth: 20".
Net Weight: 80 lb.
