Processing...
logo

Have questions? Log in to access chat





Your request is being processed. Loading...
{0} Hour(s)
{0} Day(s)
{0} Week(s)
{0} Month(s)
{0} Year(s)

more info

Click on more info to Add to order and more

Parasound Halo Series A 21+ Stereo Power Amplifier | 500W x 2 Channels

Color

- 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

Add to cart
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 A 21+ Stereo Power 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 21+ is an ultra-high performance Class A/AB stereo power amplifier. We are very proud of this latest 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 bands in the world. Curl’s inspired designs have earned Parasound world-wide acclaim and our stunning A 21+ 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

Large Filter Capacitors for Output Stage

To unleash greater dynamics, the A 21+ uses four premium quality 27,000uF Rubycon 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 outputs

Custom Heavy Duty Speaker Binding Posts

Every part within the A 21+ is carefully chosen for its accuracy, sound quality and long life. Its speaker terminals are new, developed in collaboration with CHK. Their ample size and wide spacing 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 21+ power supply is a massive 1.3 kVA toroid power transformer. 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 500 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-A21P-BL PARA-A21P-SL
2-Channel
2-Channel
501-1000W
501-1000W
300W x 2, 8 Ω both channels driven
300W x 2, 8 Ω both channels driven
500W x 2, 4 Ω both channels driven
500W x 2, 4 Ω both channels driven
1000W x 1, 8 Ω Bridged; 4 Ω operation is not recommended
1000W x 1, 8 Ω Bridged; 4 Ω operation is not recommended
Standby: 1W
Idle (no music playing): 160W
Typical Listening levels: 300W
Maximum: 1400W
Standby: 1W
Idle (no music playing): 160W
Typical Listening levels: 300W
Maximum: 1400W
60 amps peak, per channel
60 amps peak, per channel
0.1% THD
0.1% THD
Yes
Yes
5 Hz - 100 kHz, +0/-3 dB
20 Hz - 20 kHz, +0/-0.25 dB
5 Hz - 100 kHz, +0/-3 dB
20 Hz - 20 kHz, +0/-0.25 dB
> 80 dB at 1 kHz
> 70 dB at 20 kHz
> 80 dB at 1 kHz
> 70 dB at 20 kHz
Unbalanced: 33 kΩ
Balanced: 66 kΩ,(33 kΩ per leg)
Unbalanced: 33 kΩ
Balanced: 66 kΩ,(33 kΩ per leg)
29 dB
29 dB
for 28.28 V Output into 8 Ω
Unbalanced: 1 V
Balanced: 1 V per leg
for 28.28 V Output into 8 Ω
Unbalanced: 1 V
Balanced: 1 V per leg
> 115 dB, input shorted, IHF A-weighted
> 110 dB, input shorted, unweighted
> 115 dB, input shorted, IHF A-weighted
> 110 dB, input shorted, unweighted
Audio Trigger: 2 mV - 10 mV
Audio Trigger: 2 mV - 10 mV
+9 Vdc to +12 Vdc, 5 mA
+9 Vdc to +12 Vdc, 5 mA
XLR Pin Identification
1 = Ground (Shield)
2 = Positive
3 = Negative (Return)
XLR Pin Identification
1 = Ground (Shield)
2 = Positive
3 = Negative (Return)
17.63" x 7.1" x 20" (448 x 181 x 508mm) (without feet)
17.63" x 7.75" x 20" (448 x 197 x 508mm) (with feet)
Depth with cables: 21.5" (546 mm)
17.63" x 7.1" x 20" (448 x 181 x 508mm) (without feet)
17.63" x 7.75" x 20" (448 x 197 x 508mm) (with feet)
Depth with cables: 21.5" (546 mm)
Net Weight: 88 lbs (39.9 kg) Shipping Weight: 107 lbs (48.5 kg)
Net Weight: 88 lbs (39.9 kg) Shipping Weight: 107 lbs (48.5 kg)
 
Channels
Watts Per Channel
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

Distributed Brand 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.

Keycap engravings

This feature is not currently optimized for mobile devices. We apologize for any inconvenience this may have caused. Please access Keycap engravings from a tablet or desktop computer.