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Parasound Halo Series Amplifier

PARA-AXX-A
Channels
Power / Watts

- By ordering this product with custom specifications you acknowledge that the sale is final and the product may not be returned or exchanged.

- Send us a sample of the wood that you would like the speaker to match. Your order will be placed on hold for up to 14 days as we wait for your wood sample. Samples not received after 14 days will cause your order to be canceled. Please send your physical sample along with a copy of your Triad Order attached to the address listed below.

Triad Speakers
Sales - RUSH - Paint Sample
15835 NE Cameron Blvd.
Portland, OR 97230
- Your order will be placed on hold for up to 14 days as we wait for your color sample. Samples not received after 14 days will cause your order to be canceled. Your sample must be of a solid color. Wood, multi colored wallpaper/fabrics and faux finishes CANNOT be sent as samples for custom paint matching. Please send your physical color sample along with a copy of your Triad Order attached to the address listed below.

Triad Speakers
Sales - RUSH - Paint Sample
15835 NE Cameron Blvd.
Portland, OR 97230

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Description
Specs
Support
Description
Description

Halo is Parasound’s premier line with a reputation for going head-to-head with the most expensive equipment on the market, while costing a fraction of the price. Halo has earned honors and awards that are unmatched.

Parasound Halo Series Amplifier

Halo is Parasound’s premier line with a reputation for going head-to-head with the most expensive equipment on the market while costing a fraction of the price. Halo has earned honors and awards that are unmatched. The Halo A series is a high-performance Class A/AB multi-channel amplifier. We are very proud of this achievement of Parasound engineering in concert with legendary audio equipment designer John Curl. John Curl has been designing for Parasound since 1989. He was already a legend in the '70s for designing and building mixing consoles for The Grateful Dead and Jefferson Airplane. He has designed some of the most iconic and highest regarded audio equipment in the world. Curl’s inspired designs have earned Parasound world-wide acclaim and our stunning A Series builds on this storied heritage.

Halo logo
View of XLR inputs

Balanced XLR Inputs

Recording and broadcast studios use balanced connections exclusively because of their inherent ability to reject noise and hum, thus assuring the best sound. Certain high-quality preamplifiers and surround controllers built for residential use utilize balanced connections with XLR jacks for the same reasons. All Parasound Halo series power amplifiers have balanced inputs with XLR jacks so you can take full advantage of their inherent noise reduction capability.

View of filter capacitors

Filter Capacitors for Output Stage

To unleash greater dynamics, the A Series has a total of up to 164,000uF 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.

Zoomed-in view of speaker terminals

Custom Heavy-Duty Speaker Binding Posts

Every part within the A Series is carefully chosen for its accuracy, sound quality and long life. Its heavy-duty speaker terminals provide ample size and width to accommodate even the largest gauge speaker wire or spade connectors. High quality 24 K gold-plating on the speaker terminals, input connectors and internal audio signal connections assure sound quality that won’t be compromised by corrosion.

Zoomed-in view toroid transformer

Toroid Transformer & Powerful Class A/AB Amp

The heart of the A Series power supply is a massive toroid power transformer up to 2.2 kVA. It is custom designed for well-contained radiated hum, high efficiency, and high power. The transformer has independent secondary windings and this provides more than ample voltage to each channel's power supply under the most strenuous operating conditions. Separate windings for each channel improves stereo imaging by reducing interchannel crosstalk and allows each channel to deliver up to 400 watts per channel at the same time.

Zoomed-in view of turn on options

Turn-On Options

The setting of the rear panel Turn On Options switch determines how the amplifier turns on and off. There are three options for this switch. 1) Manually by the front panel power button. 2) By connecting a 12V trigger. 3) Automatically when an audio signal is detected at the L or R Input jacks.

Specs
Specifications
PARA-A31 PARA-A51 PARA-A52P
3-Channel
5-Channel
5-Channel
250W RMS x 3, 20 Hz - 20 kHz, 8 Ω, all channels driven
250W RMS x 5, 20 Hz - 20 kHz, 8 Ω, all channels driven
180W RMS x 5, 20 Hz - 20 kHz, 8 Ω, all channels driven
400W RMS x 3, 20 Hz - 20 kHz, 4 Ω, all channels driven
400W RMS x 5, 20 Hz - 20 kHz, 4 Ω, all channels driven
255W RMS x 5, 20 Hz - 20 kHz, 4 Ω, all channels driven
n/a
n/a
n/a
Standby: 1W Maximum: 1800W
Standby: 25 Watts
Full Power into 4Ω: 3000 Watts
Standby: 1W
Idle: 125W
Maximum: 1500W
60 amps peak, per channel
60 amps peak, per channel
45 amps peak, per channel
< 0.2 % at full power
< 0.03 % at typical listening levels
< 0.2 % at full power
0.05% THD, RMS continuous power, full audio band (20 Hz - 20 kHz)
Yes
Yes
Yes
5 Hz - 100 kHz, +0/-3 dB at 1W
5 Hz - 100 kHz, +0/-3 dB at 1W
5 Hz - 100 kHz, +0/-3 dB
20 Hz - 20 kHz, +0/-0.3 dB
> 78 dB at 1 kHz
> 63 dB at 20 kHz
> 78 dB at 1 kHz
> 63 dB at 20 kHz
> 78 dB at 1 kHz
> 63 dB at 20 kHz
Unbalanced: 47k Ω
Balanced: 94k Ω per leg
47 k Ω unbalanced
94 k Ω balanced
Unbalanced: 47 kΩ
Balanced: 94 kΩ, 47 kΩ per leg
29 dB
29 dB
29 dB
for 28.28 V Output into 8Ω
Unbalanced: 1 V
Balanced: 1 V per leg
(Gain controls set to Normal / THX)
Unbalanced: 1 V
Balanced: 1 V per leg
Unbalanced: 1 V
Balanced: 1 V per leg
> 112 dB, input shorted, IHF A-weighted
> 102 dB, input shorted, unweigh
> 112 dB, input shorted, IHF A-weighted
> 102 dB, input shorted, unweigh
> 112 dB, input shorted, IHF A-weighted
> 102 dB, input shorted, unweigh
Audio Trigger: 2 mV AC - 10 mV AC
Audio Trigger: 50 mV AC - 250 mV AC
Audio Trigger: 2 mV - 10 mV
+9 Vdc to +12 Vdc, 2 mA
+9 Vdc to +12 Vdc, 2 mA
+9 Vdc to +12 Vdc, 2 mA
XLR Pin Identification
1 = Ground (Shield)
2 = Positive
3 = Negative (Return)
XLR Pin Identification
1 = Ground (Shield)
2 = Positive
3 = Negative (Return)
XLR Pin Identification
1 = Ground (Shield)
2 = Positive
3 = Negative (Return)
17.5" x 7" x 19.13" (445 x 178 x 485mm) (without feet)
17.5" x 7.63" x 19.13" (445 x 194 x 485mm) (with feet)
17.5" x 7" x 20" (445 x 178 x 508mm) (without feet)
17.5" x 7.63" x 20" (448 x 194 x 508mm) (with feet)
17.25" x 5.25" x 20" (437 x 133 x 508mm) (without feet)
17.25" x 5.88" x 20" (437 x 149 x 508mm) (with feet)
Depth with cables: 21.25" (540mm)
Net Weight:65 lbs (29.5 kg)
Shipping Weight: 79 lbs (35.9 kg)
Net Weight: 80 lbs (36.4 kg)
Shipping Weight: 87 lbs (39.5 kg)
Net Weight: 55 lbs (25 kg)
Shipping Weight: 69 lbs (31.3 kg)
 
Channels
Power Output @ 8 ohm
Power Output @ 4 ohm
Power Output Bridged @ 8 ohm
Power Consumption
Current Rating
Total Harmonic Distortion (THD)
Power RMS
Frequency Response
Audio Crosstalk
Impedance Input
Audio Gain
Sensitivity Input
Signal to Noise Ratio
Amplifier Requirements
External Trigger Voltage
Connectors
Dimensions (W x H x D)
Weight
Support
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Affiliate Warranty

We want to make our Affiliate program as easy as possible. That’s why we process all claims directly, without any third party telephone tag. Specific warranty terms and details from the manufacturer are below. View the full Parasound Warranty.

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