My new inexpensive power supplies arrived, and I'm listening to some old Kef Chorale III speakers powered by my Computer -->M-audio transit, and it sounds great. I've used these speakers over the years with many different amps (Advent Receiver, Sony Receiver, Hafler 220 amp), and they never sounded this good. I'm using this very inexpensive power supply:
http://www.bgmicro.com/prodinfo.asp?...1&cri=&stype=1
I ordered three of those ps and 3 t-amps for computer systems. They work great (except the connector isn't as tight as it should be in one of the t-amps - we're not talking about first rate build quality on the T-Amps, of course. They may not be the highest audiophile supplies (it's a regulated switching supply), but it sounds very good. I am using an SLA battery upstairs, and I compared this supply with the battery for 20 mins - any difference is difficult to detect to my ears (I think bass definition might have been a tiny bit better with the SLA battery, but it was very slight and it might have been my imagination). The SLA battery also might have been a tiny bit louder, but again, I'm really not sure.
I am using the T-Amp/SLA with B&W 302 speakers upstairs (driven by a Xitel usb dac). Downstairs I'm using the T-Amp with that switching PS driving Kef Chorale IIIs (circa 1980). You know what - the Kefs sound better than the B&Ws - quite a bit better. Maybe it's just my preference for bass reflex speakers - the sound is just so well defined. The low end on the B&Ws may be deeper, but it's just not as clean. I'm listening to Glenn Gould's goldbergs from the latest A State of Wonder release, and you hear EVERYTHING crystal clear. His humming has never been so defined and clear! The speakers are not shielded, but i've managed to move them far enough away from the monitor to eliminate video problems and the soundstage and imaging are very good. It's possible I'm hearing the difference between the Xitel and the M-Audio transit (the transit is much better, and has asio), but I suspect it's the speakers. I'm stunned with how good this sounds.
Now I need to go upstairs and try them on NHT super zeros in lieu of a big Hafler DH-220 amp.