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4.6Out of 134 Reviews

    • A52+ Halo Five Channel Power Amplifier Black
      • A52+ Halo Five Channel Power Amplifier Black
      • A52+ Halo Five Channel Power Amplifier Black


      Parasound A52+ Halo Five Channel Power Amplifier Black



        Call us for shipping information (0) - 10 - 20 days Available in store: Check availability

        Award-winning Halo A 52 performance is back. Now with 44% more power! The new Parasound Halo A 52+ five-channel amplifier uses John Curl-designed circuitry for better performance than ever. And the original Halo A 52 is a tough act to follow.

        Product description

        Every Part is Chosen for Accuracy & Reliability

        Every part used in the A 52+ is carefully chosen for its accuracy and reliability. Metal film resistors with 1% tolerance are selected for their precision and because their values don't drift as they heat up during operation. Polypropylene and mica capacitors are used extensively for their superior linearity and low dielectric absorption. Semiconductors are selected for superior performance in their specific roles in the circuit. Gold has the best conductivity of any metal, so we use high quality gold-plated input connectors and speaker terminals.

        The double-sided circuit boards are FR4 glass epoxy for long-term durability. The chassis is made of heavy gauge steel to safely house the internal circuitry. This attention to detail when selecting parts makes the difference between a very good amplifier and an outstanding amplifier.

        Highly Efficient & Quiet Power Supply

        The heart of the Halo A 52+ power supply is a 1.5 kVA toroid power transformer, chosen for its efficiency, low hum field, and high power rating. Encapsulating this massive power transformer in an epoxy-filled steel canister assures ultra-quiet performance.

        The A 52+ power transformer employs multiple independent secondary windings, so that each amplifier channel has its own power supply, assuring more than ample DC voltage at all times and under all conditions. It also reduces inter-channel crosstalk that can blur the sound and impair the correct sense of where instruments, dialogue and effects are positioned.

        Each channel's +/- 80 Vdc B+ and B- supply rails use high-speed rectifier diodes and two Rubycon custom-made 10,000uF electrolytic filter capacitors, chosen for their low Equivalent Series Resistance (ESR), dielectric absorption and resistance to high temperature. In addition, these filter capacitors are bypassed with smaller polypropylene capacitors to reduce AC ripple in the DC supply and to further eliminate noise and interference that is generated in AC power lines from computers and other appliances in the home.


        - 180 watts RMS x 5 @ 8 Ω

        - 255 watts RMS x 5 @ 4 Ω

        - 225 watts RMS x 2 @ 8 Ω

        - 350 watts RMS x 2 @ 4 Ω

        - 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 µF 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)

        Parasound A52+ Halo Amplifier User's Manual


        Power Output - All 5 Channels Driven 
        180 watts x 5, 8 Ω 
        255 watts x 5, 4 Ω

        Power Output - 2 Channels Driven 
        225 watts x 2, 8 Ω 
        350 watts x 2, 4 Ω

        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 kΩ 
        Balanced: 94 kΩ, 47 kΩ per leg

        Input Sensitivity for 28.28 V Output into 8 Ω 
        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)

        Width: 171/4
        Height without feet: 51/4
        Height with feet: 57/8
        Depth: 20" (508 mm) 
        Depth with cables: 211/4

        Net Weight: 55 lbs

        Shipping Weight: 69 lbs

        Power Requirement 
        Standby: 1 Watt 
        Idle: 125 Watts 
        Maximum: 1500 Watts

        Contact us to inquire how you can finance your purchase through our partner, Synchrony.

        Available in store


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