POWER AMPLIFIER REVIEWS

AT527NC Amplifier
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AT524NC Amplifier
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AT A GLANCE
Plus
Very powerful
Natural and balanced
Made in the U.S.A.
Minus
LEDs are too bright

THE VERDICT
The days of looking down on Class D amps are over.

Two and a half years ago, I reviewed my first ATI amplifier, and to say I was impressed would be an understatement. The ATI Signature AT6005 five-channel amp set a new benchmark for its designer, Morris Kessler—to the point where he put his John Hancock on the faceplate.

Last year, S&V editor-at-large Bob Ankosko sat down with Kessler to talk about his design philosophy over the years, and the subject of Class D amps was broached. Kessler mentioned that his current designs were all Class A/B, but he was following the developments of Class D very closely—though the initial efforts in this area didn’t meet his high standards because frequency response varied greatly as the impedance of the speaker changed. He hinted at the time that he may have finally found a Class D solution that he could deem acceptable, which turned out to be the latest Hypex Ncore modules.

Performance
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AT A GLANCE
Plus
A new take on amplifier classes with iBias
Superb dynamics and soundstage
Ethernet capability for system monitoring
Minus
LED illumination too bright
Extremely heavy

THE VERDICT
Krell’s iBias technology has allowed them to deliver the benefits of a Class A multichannel amplifier in a way that will have audiophiles grinning from ear to ear.

Do you remember what it was like sitting for your high school or college lessons? Well, get ready for a trip down memory lane, because to give the Krell Chorus 7200 the praise it’s due and explain just how much this “little”-amplifier-that-could is going to change the audio industry, we’ll need to start with a short class in “classes.”

CX-A5000 Surround Processor
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Video Performance
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MX-A5000 Amplifier
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AT A GLANCE
Plus
Audiophile pre/pro sound quality
Impeccable build quality
Apple AirPlay support
Minus
Amp performance merely competent
Limited network interface

THE VERDICT
Yamaha’s new pre/pro is a surefire contender, though its matching 11-channel amplifier wasn’t quite the same caliber.

If you’re in the market for a new AVR, you can spend countless hours researching all of the various manufacturers’ Websites and, when all is said and done, still have 20 or more models to choose from that have all the bells and whistles you want. The same can’t be said for the surround processor market, which is extremely limited by comparison.

Most companies offer only one model—if that—and it’s generally a reconstruction of their flagship AVR minus the amp section. Don’t expect a discounted price, though; with such a limited audience for pre/pros, you can expect to pay top dollar even when the amps are absent. That said, this isn’t such a bad deal because you can then choose an amplifier that mates well with your particular speakers. Furthermore, by having the electronically noisy amps in a separate enclosure, energized by their own dedicated power supply, you can theoretically enjoy improved audio quality. Of course, you also get an increased footprint in your rack with additional black boxes. The quest for audio nirvana certainly isn’t easy.

Emotiva. The name sounds like the latest cure-all marketed by Big Pharma on the evening news programs. (Remember “restless leg?”) It is, in fact the consumer-audio brand of Tennessee’s Jade Designs. And Jade Designs, in turn, is the direct-to-consumer brand founded by a longtime veteran of the rough-and-tumble electronics OEM (original equipment manufacturing) world.

AV8801 Surround Processor
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MM8077 Amplifier
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As A/V enthusiasts, we are constantly on the lookout for the best audio and video we can find, and when we reach that state of nirvana, we enjoy our equipment until the next CES or CEDIA when we then hear about something new and begin to worry that our system will soon be second best. Writing for Home Theater makes me an unwilling accomplice in this never-ending cycle of upgrade-itis, but truth be told, I’m just as affected by this as the rest of you. Thankfully, I’m able to get my fix by having lots of equipment moving through my rack, but every now and then, I fall in love with a piece and don’t want it to leave my possession.

Class D amplification has a narcotic-like hold on the audio electronics industry. These switching-mode designs mesmerize with a dazzling array of advantages: high efficiency, high power output, low weight, compact dimensions, and depending on implementation, enormous cost savings.