Parasound A21 Power Amplifier

Description

Features

• 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
• 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 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, 12v trigger out

Specs

Continuous power output:
250 watts RMS x 2, 20 Hz – 20 kHz, 8 ?, all channels driven
400 watts RMS x 2, 20 Hz – 20 kHz, 4 ?, all channels driven
750 watts RMS x 1, 20 Hz – 20 kHz, 8 ?

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:
> 80 dB at 1 kHz;
> 63 dB at 20 kHz

Input sensitivity:
1 V for 28.28 V, THX Reference Level

Input impedance:
33 k ? unbalanced; 66 k ? balanced

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

Damping factor:
> 1100 at 20 Hz

Voltage:
110V – 120V

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

Net weight: 60 lb.

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Stereo and Video Magazine May 2014