A great article on Class D/switching amps


The latest edition of The Absolute Sound has, in my opinion, the best overall perspective and evaluation of the eight most regarded class D switching amps on the market today.

The article contains an explanation of the technology, an interview with a couple of the most important designers, the individual reviews and finally a round table discussion regarding these amps.

I believe any of you GON members who might be considering auditioning a class D switching amp would want to review this piece regarding their different sonic signatures.

I had the pleasure of listening to the Kharma MP150 which the panel picked as being on top of the "heap" compared to Audio Research 300.2,Channel Island Audio D-200, Nuforce Reference 9 Special Edition, Red Dragon Audio Leviathan Signature, Jeff Roland Design Group 201, Cary Audio Design A 306,and finally the Spectron Musician III.

Each amp had at least two different reviewers with different systems evaluate them and then compare their experiences. This was a well done piece and if you read it I believe you find it both educational and helpful to understand what these amps are all about.
teajay
Bobgates -
Let me respond to each of your comments separately.

I would agree that Class D technology is still evolving. Those things which are not still evolving have been abandoned.
To some reviewers, Class D will seem cold and sterile because it lacks the distortion components that they interpret as warmth.
As for the used market, please note that Class D is not so new. I bought my first pair of Rowland 201 about a year after they became available and that was 3 years ago. The fact that something is for sale on the used market doesn't "goes to show" anything other than the fact that people bought them new and decided to try something else. In fact, it might well mean that they liked Class D so much that they upgraded within the genre.
What is everyones cup of tea,thats boring.Seriously what do you think the Krell guy is going to say?
Teajay, I had a chance to audition Jeff Rowland Model 501/Concerto pre combo in my systems and did not like it at all. Despite nice, powerfull bottom end everything else in sound presentation was wrong IMHO. As J.Valin correctly ponit out treble info is very limited and you got "cut-off" feeling most of the time. Midrange was detailed, but somehow mechanical in presentation. Two friends of mine visited me during several days(actually 25days!) auditioning period and both of them did not like Rowland sound. One of them owns same amps(Pass XA100) as you do. I also had a chance to audition Bel Canto REF1000s and did not like them as well.
BTW, it is pretty interesting that both J.Valin and R.Harley did not like D-class amp too much, but both of them are using pretty good tube and solid state amps as their reference's.
IMHO D(or T) class amps have a very long way to go before we will have something of truly reference calibar here. That strange high frequency behaviour is still a problem of most D class amps and this problem is not pretty simple to solve(look at the way D class amps work).
Of course, it is only my humble opinion...
There seems to be two parties, in which the audiophiles could be divided: audiophiles in one party dislike class D amplification because of the artificial, cold and non-organic sound, while the audiophiles in the other party like the class D amps for having a clean, dynamic and true to life sound. Why does this outspoken dichotomy exist? Why do some audiophiles prefer the sound of class D amplification in stead of multi thousand $$ conventional amplification? I read a story about this very rich audiophile who replaced his one million $$ worth of WAVAC amplification with class D amplification and it was not because he needed the money. It is quite puzzling to me.

Chris
Dazz I think you're being too simplistic about this. I like some class D amps, don't own one, but wouldn't place myself in either one of your divisions.

However, the topic seems to rise blood pressure in many audiophiles.