Parasound A31 3 Channel Power Amplifier

Description

• 250 watts x 3 @ 8 Ohms / 400 watts x 3 @ 4 Ohms
• Adjustable gain for up to +6db 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
• 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)

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.

Shipping weight: 79 lb

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