Class "D" switching amp ?

here's a good thread:
http://forum.audiogon.com/cgi-bin/fr.pl?aamps&1069142931&read&3&4&

BTW, they are not new. Infinity had a class D switching amp about 25 years ago.

technology is John Ulrich at Spectron Audio (formerly co-founder of Infinity). See www.stereotimes.com for a review of the superb Musician II. The MII's are now officially phased out with the Musician 3 and 3D due for release within the next 30 days or so. See the www.spectronaudio.com site for more info.

Class D, that reminds me of when I was selling Hi Fi while going to college in the late 70's. Yes there was the Infinity, the same vintage as their classic FET preamp and Sony also had one, the TAN 88B I believe. I had a couple of those. Great bass was their claim to fame. The Infinity was very smooth by comparison to the Sony, but not too reliable as I recall. We used to use it on the Infinity QLS 1's.

I do not think a class D amp is digital, but it works with a switched power supply, very efficient, running cool and therefor ideally suited to built in a small place like a subwoofer.