Skip disability assistance statement.

Welcome to our website! As we have the ability to list over one million items on our website (our selection changes all of the time), it is not feasible for a company our size to record and playback the descriptions on every item on our website. However, if you have a disability we are here to help you. Please call our disability services phone line at (203) 968-1515 during regular business hours and one of our kind and friendly personal shoppers will help you navigate through our website, help conduct advanced searches, help you choose the item you are looking for with the specifications you are seeking, read you the specifications of any item and consult with you about the products themselves. There is no charge for the help of this personal shopper for anyone with a disability. Finally, your personal shopper will explain our Privacy Policy and Terms of Service, and help you place an order if you so desire.

A 52+ Five Channel Power Amplifier

Parasound A52
Halo Collection

Quick Specs

  • Type: Amplifier

This item has purchase restrictions.

We currently only offer this product for purchase within 150 miles of our store. Questions? Contact us for more information.


, 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

    Quick Specs

    • Appearance

    • Type: Amplifier

    A 52+ Owner's Manual

    A 52+ Cut Sheet

    Parasound Amp BTU Ratings

    Get Adobe Reader

    * Documents require Adobe Reader.

    Extended warranties are usually very inexpensive and can save you thousands in the future. It's simple and inexpensive to purchase extended warranties and one of the smartest ways to protect your investment.

    Electronics can be large, heavy and expensive. You probably don't have the special tools or expertise needed to fix them in a crisis. If you can spare a few thousand dollars without batting an eyelash for new electronics should they break tomorrow, don't buy a warranty. But if you're like most of us, protect yourself by purchasing inexpensive extended warranties when you buy a new product and save yourself big money in the long run.