Parasound A31

A 3 x 250W THX Ultra2 with high bias Class A/AB power amplifier.

Features

• Circuitry designed by legendary John Curl

• 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

• 16 beta-matched 15 amp, 60 MHz bipolar output transistors

• 1.2 kVA encapsulated toroid power transformer with independent

• secondary windings for each channel

• 100,000 ?F 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, 12v trigger out
  4u Chassis, carry handles, rack mounting adapter included

Specification

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 &ohm; unbalanced; 94 k &ohm; balanced

S/N ratio:
112 dB, input shorted, IHF A-weighted

Damping factor:
> 1100 at 20 Hz

Dimensions:
17-1/4" w x 7-5/8" h x 19-1/8" d, 7" h without feet

Net weight:  30kgs

Shipping weight: 36 kgs