Parasound Halo A31 Three-Channel Power Amplifier

*250 watts RMS x 3, 8 Ohms
*400 watts RMS x 3, 4 Ohms
*THX Ultra2 certified
*Circuitry designed by legendary John Curl
*High bias Class A/AB operation
*Balanced inputs of discrete circuits and XLR connectors
*Direct Coupled
*MOSFET driver stage and JFET input stage

  • 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
  • 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
  • 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

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 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

Dimensions:
17-1/2″ w x 7-5/8″ h x 20″ d, 7″ h without feet

Net weight: 65 lb.

https://parasound.com/a31.php

 

Multi-awarded & reviews:

Soundstage Access April 2015

Secrets of Home Theater and High Fidelity 

Stereophile September 2012

 

Price:  RM17,000