A21

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.

Overview & 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
  • 4u Chassis, carry handles, rack mounting adapter included

Parasound A21

Power Amplifier

Midland HiFi Studio - Key Information



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