Skip to content


Your cart is empty


Subscribe to receive updates, access to exclusive deals, and more... We promise not to give your info away.

Parasound Halo A21 Amplifier in Black - Complete and Like New

Sale price$0.00
Free Shipping on *ALL* Electronics (Excluding Speakers, Contiguous 48 US States Only)

Pickup currently unavailable at SkyFi 479

Parasound Halo A21 Amplifier In Black - Complete And Like New

Parasound Halo A21 Amplifier in Black - Complete and Like New

SkyFi 479

Pickup currently unavailable

479 South Broad Street
Glen Rock NJ 07452
United States


Not a visible scratch or fingerprint anywhere.  250W x two channels and up to 750W x one channel at 8 ohms bridged!

With balanced XLR inputs, unbalanced RCA inputs, and 12V auto trigger amp turn-on capability.  Beefy speaker terminals accept spades or bananas.

We were going to write some background about Parasound and what we feel stands out about the brand, but their website does it best:

"In the complicated landscape of audio, many companies put stratospheric price tags on great performance. Our mission couldn't be more different. Simply put, we offer the most performance for the money by finding the sweetest spot between price and diminishing returns. We've all been on the consumer side: music lovers, musicians, and audio enthusiasts looking for top-tier sound without breaking the bank.

Everything we do at Parasound is customer-centric because that's how we define value. Most of our customers don't have trust funds and have to work for their money — so we give them their money's worth and then some. Every time another expert compares our product to equipment that costs three times as much, we have succeeded."

A Few Standout Features:
- Circuitry designed by legendary John Curl
- THX Ultra2 certified
- High bias Class A/AB operation
- Balanced inputs with discrete circuits and XLR connectors
- Direct Coupled - no capacitors or inductors in signal path
- Auto turn-on by 12v trigger or audio signal, 12v trigger out

From an Audioholics Review:
"The A 21 and A 51 amplifiers are both loaded with usable features above and beyond most other amplifiers in today's market."

"I cranked the volume way up and found myself free of that inhibiting audio alarm in my head that nags at me to turn it back down."

"...Parasound seems to have attended to every aspect of their design including the excellent build quality internally and externally matched with great looks."

"Overall Rating: 5/5 Stars - Ken Stein and Steve Dellasala" 


Continuous power output:
250 watts RMS x 2, 20 Hz - 20 kHz, 8 Ω, all channels driven
400 watts RMS x 2, 20 Hz - 20 kHz, 4 Ω, all channels driven
750 watts RMS x 1, 20 Hz - 20 kHz, 8 Ω

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:
> 80 dB at 1 kHz;
> 63 dB at 20 kHz

Input sensitivity:
1 V for 28.28 V,

THX Reference Level Input impedance:
33 k Ω unbalanced; 66 k Ω balanced

S/N ratio:
112 dB, input shorted, IHF A-weighted

Damping factor:
> 1100 at 20 Hz

110V - 120V

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

Net weight: 60 lb.

Click here to download Brochures & Documentation for this piece

Please click here for detailed specifics regarding our specialized packing process that separates us from the rest.



Original Box







Yes - As Pictured

Physical Condition


Working Condition


SKU: 100339