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Cutting Edge Electronics since 1982
phone 918-495-0586
Explore Tulsa
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A 52+ Five Channel Power Amplifier

Model # A52

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, 450 , or 250 .

  • 180 watts RMS x 5 @ 8
  • 255 watts RMS x 5 @ 4
  • 225 watts RMS x 2 @ 8
  • 350 watts RMS x 2 @ 4
  • Class A/AB circuitry designed by legendary John Curl
  • Direct coupled - no capacitors or inductors in audio path ensures the cleanest signal
  • Balanced XLR inputs with discrete circuits
  • Full power is rated all the way down to 5Hz for unrestricted low-end bass
  • Custom 1.5 kVA encapsulated toroid power transformer with independent secondary windings for each channel
  • Hand-matched JFETs for input stage
  • Hand-matched MOSFETs for driver stage
  • Beta-matched 15 amp, 60 MHz bipolar output transistors (3 pairs per channel)
  • 100,000 F power supply filter capacitance
  • DC Servo and relay protection circuits
  • Auto turn on by audio signal or 12V trigger
  • Heavy-duty 24k gold-plated, 5-way speaker terminals
  • 3U chassis with updated cosmetics, rack mountable with HRA3 (sold separately)
  • Power Output - All 5 Channels Driven 180 watts x 5, 8
    255 watts x 5, 4
    Power Output - 2 Channels Driven 225 watts x 2, 8
    350 watts x 2, 4
    Power measurements parameters with 120VAC 0.05% THD, RMS continuous power,
    full audio band (20 Hz - 20 kHz)
    Current Capacity: 45 amperes peak, per channel
    Dynamic Headroom: >1.5dB
    Slew Rate > 130 volts per microsecond
    Frequency Response 5 Hz - 100 kHz, +0/-3 dB
    20 Hz - 20 kHz, +0/-0.3 dB
    Total Harmonic Distortion (THD) < 0.05 % at full power
    < 0.03 % at typical listening levels
    IM Distortion < 0.04 %
    TIM Unmeasurable
    Interchannel Crosstalk > 78 dB at 1 kHz
    > 63 dB at 20 kHz
    Input Impedance Unbalanced: 47 k
    Balanced: 94 k , 47 k per leg
    Input Sensitivity for 28.28 V Output into 8 Unbalanced: 1 V
    Balanced: 1 V per leg
    Total Gain: 29 dB
    S/N Ratio > 112 dB, input shorted, IHF A-weighted
    > 102 dB, input shorted, unweighted
    Damping Factor > 1100 at 20 Hz
    DC Trigger Requirements +9 Vdc to +12 Vdc, 5 mA
    Audio Trigger Requirements 2 mV - 10 mV
    XLR Pin Identification 1 = Ground (Shield)
    2 = Positive
    3 = Negative (Return)
    Dimensions Width: 17-1/4" (437 mm)
    Height without feet: 5-1/4" (133 mm)
    Height with feet: 5-7/8" (149 mm)
    Depth: 20" (508 mm)
    Depth with cables: 21-1/4" (540 mm)
    Net Weight 55 lb. (25 kg)
    Shipping Weight 69 lb. (31.3 kg)
    Power Requirement Standby: 1 Watt
    Idle: 125 Watts
    Maximum: 1500 Watts

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