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Parasound Halo A 21 Two Channel Power Amplifier: Black

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  • 250 watts x 2 @ 8 Ohms / 400 watts x 2 @ 4 Ohms
  • Adjustable gain for up to +6db over THX Reference level
  • 250 watts rms per channel into 8Ω, all channels driven
  • Level controls for each channel
  • THX Ultra2 certified
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Product details

  • Product Dimensions: 45.7 x 50.8 x 20.3 cm ; 27 Kg
  • Boxed-product Weight: 32 Kg
  • Item model number: Halo A 21
  • ASIN: B003O2QB7M
  • Date first available at 28 Mar. 2014

Product Description

250-Watt THX Ultra II Amp Hits a 'Home Run' Parasound's Halo A21 two-channel power amplifier has the brute force you need for ultra-realistic musical reproduction and hair-raising movie soundtracks. Its raw power is matched by elegant circuit design from audio guru John Curl in collaboration with CTC Builders. "Highly Suitable for Driving Anything" The Absolute Sound magazine rated the Halo A21 as the "Best Solid-State Amplifier" in the Winter 08 / Spring 09 issue, praising it as "highly suitable for driving anything from power-hungry planars like Maggies to low-sensitivity acoustic suspension cones." The A21 is the two-channel version of Parasound's benchmark A51 five-channel amp, which the May 2003 issue of DVD Etc. magazine said hit the "proverbial home run." Matched JFET inputs, MOSFET drivers, and high-current bipolar outputs contribute to its exceptional performance. "Close Enough to the Very Best" Balanced Inputs and Discrete Circuits The A21 boasts balanced inputs with discrete circuits and XLR connectors. Beautifully implemented high-bias Class A / AB operation makes the most of an impressive 250-watt-per-channel power output at 8 ohms and 400-watts-per-channel at 4 ohms. The 1.2 kVA encapsulated toroidal power transformer with independent secondary windings for each channel and 100,000 µF power supply filter capacitance delivers an impressive current capacity of 60 amps per channel. The direct-coupled design uses no capacitors or inductors in signal path. The complementary MOSFET driver stage relies on the firepower of 16 beta-matched 15 amp, 60 MHz bipolar output transistors and works in combination with a JFET input stage. 'Instant Warm-up' Feature Auto turn-on by 12-volt trigger or audio signal simplifies home theater and multi-room operation. Other features include heavy-duty 24k gold-plated five-way speaker terminals, gold-plated RCA input jacks, and a rear-panel ground lift switch.

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Most Helpful Customer Reviews on (beta) HASH(0x8ab76db0) out of 5 stars 3 reviews
10 of 11 people found the following review helpful
HASH(0x8ae6dd74) out of 5 stars Parasound Products, Simply Unbeatable Value, Rock Solid Build Quality, and Unmatched Customer Service (Second To None) 19 Dec. 2015
By LiteJazz - Published on
With my review of this amplifier, I hope I can help some potential buyers see a bit more clearly. I have enjoyed Jeff Rowland equipment for at least the last 17 years, the Concentra as well as the extremely powerful 8T-HC 250 watt (8 ohms) High Current power amplifier, both stunning pieces, the Concentra cost about $12,000.00 and the 8Ti-HC was $17,000.00, and that was over 15 years ago! I sold both Jeff Rowland pieces for thousands of dollars and just for the fun of it bought all new Parasound, a rack full, including the HALO JC-2 BP Pre-Amp, the HALO A-21 Power Amplifier, the HALO JC-3+ Phono Amp and finally for my second system the HALO Integrated Amplifier. The JC-2 BP and the A-21 are easily as good as my Jeff Rowland products, and those amplifiers were A/AB amps, no D configuration amps in that vintage. One thing I had to get used to was the really detailed midrange with the JC-2/A-21 combination. This Parasound equipment is as good as any normal audiophile could ever want or need, the amplifier puts out tremendous power, I could never approach what it's capable of, and as I said, my ears have been spoiled by one of America's top amplifier manufacturers, Jeff Rowland Design Group and I would put the JC-2 BP/ A-21 combination up against their products any day, that is how good the Parasound is, there is simply no sane reason to spend more money, no reason, and that includes the Parasound mono blocks. Why would anyone want to take up that much space and burn that much electricity? The A-21 is a monster, you just don't need any more power unless you are attempting to drive some Magnepan 20 speakers! I looked at Hegel and for me, they just look like a black box, my equipment must have some style and stunning sound, and the Parasound equipment simply delivers. Hey, I do miss the beautiful aircraft aluminum on those Jeff Rowland pieces, you bet, but sound wise, I'm in good hands with Parasound HALO. One thing many people forget about is service. When you need to have your 8 year old Parasound amplifier repaired, chances are they are going to be able to help you, unlike others that simply discontinue not only parts but service. If you ever have a problem, you can pick up the phone and speak to Richard (CEO) of Parasound personally, it just does not get better than that. I hope you consider Parasound HALO products, I have been so extremely pleased with everything I purchased from them, it's just cutting edge and performance wise, way, way about it's price range in the audio market, unbelievable value! I just ordered the HINT, Parasound's new integrated amplifier, have you seen the reviews on that piece, heck you probably won't even need the A-21, the new integrated is crushing all integrated amplifiers anywhere near it's price range, it's a monster as well. If you want the very best, go with the Parasound Integrated, the HINT. If you want to just have the finest system any audiophile would be proud of, go with the JC-2/A-21 combination.
18 of 23 people found the following review helpful
HASH(0x8c7db408) out of 5 stars A truly 3D holographic playback stereo system that does NOT sound like "canned music" is what I have been selling for ... 3 Feb. 2015
By Posh Hippie - Published on
I am a retired audio equipment salesman who has built recording studios for artists you have heard of.

A truly 3D holographic playback stereo system that does NOT sound like "canned music" is what I have been selling for 50 years starting back when all we had was tubes. I have been a dealer for McIntosh, Krell, Sonus Faber, Martin Logan, Bryston, Sansui, Adcom and many many other darn near price no object lines.

I know fine equipment the way wine experts know fine wine.

The job of a power amplifier is to properly control your chosen speaker at any and all ranges of power that it can handle. It must have enough clean power to NEVER distort as distortion blows speakers! A lot of folks think too much power blows speakers but the opposite is true---too little power will fry your speakers because an amp starts putting out HEAT instead of music once you turn the know up too far. And HEAT fries the speaker.

The Parasound has 250 watts CLEAN. So virtually all speakers will be happy with it.

The SOUND of a truly great amplifier compared to just a powerful but not-so-great design is that the truly great amps sound ALIVE.

Instruments will be EXACTLY etched in space in 3D just like a 3D television which also makes its image in STEREO.

In addition there are all kinds of life-like qualities which a great amp possesses. Like for instance tiny little differences in the TONE of an instrument. The kind of details that fool your ear into believing you are actually THERE at the recording session IN THE ROOM.

The Parasound does all these great deeds. Perhaps there are amplifiers that exceed what it can do. But so far I haven't heard anything priced UNDER it which can qualify as REAL.

I would recommend using it as your go-to amplifier with most any speaker priced under ten grand. I use mine in a 45 thousand dollar mastering studio. I also bought one to use with a small room which has just a pair of mini speakers (a small recording studio for home use).

Considering how many simply awful amps you can buy that will muddy your audio this amp is pretty much a no brainer.

As just mentioned by the first review---Emotiva costs just as much and sounds pretty harsh and muddy in comparison.

This amp is designed by John Curl who also designed the famous Mark Levinson amps when he worked there. Curl must have had a secret yen to produce a great amp for the masses. At one tenth the price of what he normally gets.

This amp is the current "best bang for the buck" in all of amp land. It took that pride of place away from the Nelson Pass designed Adcom GFA555. The Adcom USED to be the best amp on the market under ten grand. But for the last five years or so since it came out the Parasound is the champ.

Enjoy it. It is truly high end and more importantly it is truly "high fidelity."
17 of 26 people found the following review helpful
HASH(0x8add6744) out of 5 stars it's like too good to be true 3 Nov. 2014
By Stharling - Published on
l bought the Parasound halo a21 and the differences of improvement in the sound quality are just unreal, it's like too good to be true, before the parasound i had an Emotiva XPA and after listened to the differences btw the emo and the parasound i got to the conclusion that emotiva made my speakers sounded so bad, the sound quality is night and day differences, I'm was shocked!! It's just unbelievable, to give you a better hint of what I'm talking about, the emotiva is a Honda and the Parasound is a mercedez Benz s63 AMG, or Toyota vs Ferrari lol. I can't believe the sound just can get that good.

Emotiva is not High End they not even close to what high end can sounds like, they are good products but never can consider high end, since they claim to be high end, for the price you can get a good sound, but they are out of the high end league, that's a true statement. it's not an opinion It's what it's, when i demo the parasound i put it side by side with 10,000$ and 12,000 dollars amplifiers and the halo sounded just as good as those super expensive amps.

The emotiva was my first amplifier so that's why i wrote a review saying that Emotiva was a truly High end Amp with a consumer price tag LOL, what the Hell i was thinking OMG i was soooooo wrong.

I was only getting 20% of my sonus faber veneres with the emotiva, now I believe I'm getting their full potential 100%, I believed the hype of the emotiva for a while, I was a believer but now i know emotiva is just a good mid-fi amp, nothing more!! If you looking for the best sound as possible please don't get the emotiva, emotiva is not even close to high end, you will be disappointed!! The parasound is the best AMP you can get for the money, i believe that you can spent the double of the money and won't get this kind of performance, Halo is the best Bang for your Buck and i finally i found the product that i want to use forever.

to get a better understanding of what i'm talking about, let's say Parasound vs krell is like mercedez benz S Class AMG vs roll royce!!! all depends your budget and how much money you want to spent, but me personally i'm gonna stick with the parasound halo forever.
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