A 51 Power Amplifier

Parasound A 51 5 Channel Power Amplifier

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
•  40 beta-matched 15 amp, 60 MHz bipolar output transistors
•  2.2 kVA encapsulated toroid power transformer with independent
    secondary windings for each channel
•  164,000 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
•  4u Chassis, carry handles, rack mounting adapter included
•  Parasound 10 year parts, 5 years labor warranty
  

  Continuous power output:
        250 watts RMS x 5, 20 Hz - 20 kHz, 8 Ω, all channels driven
        400 watts RMS x 5, 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 Lev

        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

        Voltage:
        110V - 120V

        Dimensions:
        17-1/4" w x 7-5/8" h x 20" d, 7" h without feet

        Net weight: 80 lb.