Class-D or switching amps, any opinions on??

" ... they don't mimic the special quality of tubes -- a kind of creamy sweetness in the harmonic presentation. It is easy to understand the appeal of that tube sound; it has had a grip on me for years. But what the Spectrons do is, to my mind, ultimately even more impressive....[they] have a crystalline purity in the reproduction of every voice and instrument that sounds more to me like the essence of live, unamplified music -- which I attend, on average, more than once a week year-round-- than any other amplifier, at any price, based on any technology, that I have ever heard"

-Blue Note 2009 Award for Best Amplification by Enjoy The Music to Spectron Audio amplifier - http://spectronaudio.com/

John Ulrick of Spectron is the inventor of class D audio amplifier in1976.

Check their awards and professional reviews on their web site and do Audiogon search for the owners comments/reviews.

All The Best In Your Search

Rafael

Here are some interesting links:
The International Rectifier module has a fullbridge / halfbridge selector switch for those who can't decide!

https://ec.irf.com/v6/en/US/adirect/ir;jsessionid=74D07C3679B3902FCD3E847F05518E49?cmd=catSearchFrame&domSendTo=byID&domProductQueryName=IRAUDAMP7S

Here is another link with several articles on 'd' amps.

http://www.irf.com/product-info/audio/classddesign.html

I have the IR reference board out in the garage, awaiting a power supply. I will be able to directly compare with an ICE moduled PS Audio GCC integrated, which I will probably be forced to use as a preamp! Awaiting funds to build a +-55volt ps.

Dob - Sinclair produces class D audio amplifier called X-10 in 1964 (Designer: Gordon Edge)

That is one of the best descriptions I've yet heard. Class A is more like meat and potatoes where as class D is more like sushi. Nice analogy Jax!

I have been using the Tact digital amps for sometime. The lower noise floor has allowed me to understand words in familiar songs which had been previously buried in the mix while using tubes and class a/b solid state. I interchanged the Tact with my CJ 2500A and my ARC vs55 for a few weeks, but finally I could no longer tolerate the additional noise in the analog amps. Nothing is perfect, but digital amps now offer lower noise and greater resolution than analog, and they can tailor their response curves and loudness contours to taste (and speaker demands) with no additional distortion penalty. It can only get better!