A21

Overview & Features


    C
ircuitry 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

4u Chassis, carry handles, rack mounting adapter included

Technical Specification

Continuous power output:

250 watts RMS x 2, 20 Hz - 20 kHz, 8 Ω, all channels driven

400 watts RMS x 2, 20 Hz - 20 kHz, 4 Ω, all channels driven

750 watts RMS x 1, 20 Hz - 20 kHz, 8 Ω


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 Ω unbalanced; 66 k Ω balanced


S/N ratio:

112 dB, input shorted, IHF A-weighted


Damping factor:

> 1100 at 20 Hz


Voltage:

110V - 120V


Dimensions:

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


Net weight:

60 lb.

Parasound A21

Power Amplifier

Midland HiFi Studio - Key Information



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