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Parasound HALO A31 Power Amplifier
Description of the Parasound HALO A31 Power Amplifier
The Parasound A31 is a premium three-channel amplifier designed for audiophiles and home theatre enthusiasts. It delivers 250 watts per channel at 8 ohms, providing clean, dynamic, and powerful sound for left, centre, and right channels. With its fully discrete circuitry and balanced XLR inputs, the A31 integrates seamlessly into high-end audio systems, ensuring precise sound reproduction across the entire frequency range.
- Power Output: 250 watts per channel at 8 ohms
- Design: Fully discrete circuitry with balanced XLR inputs
- Features: High-current design for demanding speakers
- Applications: Perfect for left, centre, and right channels in home theatre systems
With its high power and meticulous design, the A31 enhances your home theatre’s performance, offering superior audio quality for both movies and music.
Features of the Parasound HALO A31 Power Amplifier
- 250 watts x 3 @ 8 Ohms / 400 watts x 3 @ 4 Ohms
- Adjustable gain for up to +6 dB over THX Reference level
- Unbalanced RCA and balanced XLR inputs
- Circuitry designed by legendary John Curl
- High bias class A/AB operation
- Direct coupled (no capacitors or inductors in signal path)
- Complementary MOSFET driver stage and JFET input stage
- 24 beta-matched 15 amp, 60 MHz bipolar output transistors
- 1.5 kVA encapsulated toroid power transformer with independent
secondary windings for each channel - 98,400 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
- THX Ultra2 certified
- Auto turn-on by 12V trigger or audio signal
Specifications of the Parasound HALO A31 Power Amplifier
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: 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)
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.
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