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Parasound HALO A51 Power Amplifier
Description of the Parasound HALO A51 Power Amplifier
The Parasound A51 is a high-powered five-channel amplifier designed to bring your home theatre system to life. Delivering 250 watts per channel at 8 ohms, the A51 ensures powerful, clean, and dynamic sound across all five channels. This amplifier is THX Ultra2 certified, providing exceptional performance for even the most demanding speaker systems.
- Power Output: 250 watts per channel at 8 ohms
- Design: THX Ultra2 certified with fully balanced XLR and unbalanced RCA inputs
- Features: Advanced circuitry for low distortion and superior sound
- Applications: Perfect for immersive 5.1 or 7.1 home theatre systems
The A51 is the ultimate choice for home theatre enthusiasts who want powerful, distortion-free sound that creates an immersive audio experience.
Features of the Parasound HALO A51 Power Amplifier
- 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
Specifications of the Parasound HALO A51 Power Amplifier
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: balanced 16 V rms
< 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.
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