Parasound Halo A 31 Three-Channel Power Amplifier

Availability: In-Store Only

This item is available in-store only. Have questions or wish to purchase? Learn More

Authorized Dealer & Full Factory Warranty

  • 250 watts x 3 @ 8 Ohms / 400 watts x 3 @ 4 Ohms
  • Adjustable gain for up to +6db over THX Reference level
  • Unbalanced RCA and balanced XLR inputs
  • Circuitry designed by legendary John Curl
  • High bias class A/AB operation
  • Direct coupled (no capacitors or inductors in signal path)
  • Complementary MOSFET driver stage and JFET input stage
  • 24 beta-matched 15 amp, 60 MHz bipolar output transistors
  • 1.5 kVA encapsulated toroid power transformer with independent
      secondary windings for each channel
  • 98,400 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
  • THX Ultra2 certified
  • Auto turn-on by 12v trigger or audio signal
  • 4u Chassis, carry handles, rack mounting adapter included


    Continuous power output:
    250 watts RMS x 3, 20 Hz - 20 kHz, 8 Ω, all channels driven
    400 watts RMS x 3, 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)

    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

    17-1/2" w x 7-5/8" h x 20" d, 7" h without feet

    Net weight: 65 lb.

    Shipping weight: 79 lb.

We are in the business of creating satisfied customers. We hope you love your purchase, but in the event that you are not satisfied, you may return unopened and unused items within 30 days for a full refund of the purchase price.

In the event that merchandise is not in its original condition, has been opened, or is missing packaging, manuals, accessories or other components a partial refund will be given.  Partial refunds are calculated on a case-by-case basis but incur a minimum 15% restocking fee.

Items ineligible for return: furniture and other oversized product shipped via a Motor Freight Carrier or scheduled delivery, televisions larger than 32”, in-ear headphones, special order items, and any item that has been permanently modified (e.g. spliced wires or custom order cables).

Three Simple Steps:

1. Give us a heads up: Please call 631-585-5600 or email to let us know you’d like to return an item. We will give you a RA number (Return Authorization) to include with your order.

2. Ship it back to us: Please pack the product in its original packaging with all original contents and use the original shipping carton and packing materials. Safely and completely packaged returns are less likely to incur a damage or restocking fee. Please consider insuring and tracking your item as you are are responsible for the item until it reaches our warehouse.

Return Address:
Audio Den
Attn: Returns
RA# (Insert RA #)
2845 Middle Country Road
Lake Grove, NY 11755

3. Sit tight! We will process your return as quickly as possible and issue a credit by the original payment method. Depending on your credit issuer, it may take as long as 10 days for the refund to post.


    All orders are shipped within 48 hours Monday - Friday 10am - 6pm.


    We use the following carriers to deliver our orders:



    Order Tracking

    If a tracking # is provided by the shipping carrier, we will update your order with the tracking information. Please note that some orders using 1st Class USPS mail will not have tracking numbers.

    Shipping Rates

    The rate charged for the shipping of your order is based on the weight of your products, and your location. Before the final checkout page you will be shown what the cost of shipping will be, and you will have a chance to not place your order if you decide not to.

    Back Orders

    If an item goes on back order we will ship you the part of your order that is in stock. When the item becomes available we will ship you the rest of your order. You will not be charged any additional shipping and handling for the second shipment.