There are many amps that use Tripath controller i.c.s, some of which have received rave reviews by Stereophile and other magazines. Of course, they are very expensive ($3k+), but not outrageously so compared to some other high-end amps ($20K+).

I have a couple of Crown K1 amps. I believe that they use Tripath controller i.c.s also. In my opinion the K1 (and the more powerful K2) makes a superb subwoofer amp. I used it briefly to drive my Acoustat 2+2s just to find out how well (or bad) it would do. It sounded OK but not great working as a full-range amp.

So, depending on your application, a digital amp may work for you. Especially in situations where ventilation (or lack of) and heat buildup are a concern.

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the 1derful1