The Audiosource uses the latest Tripath, which is what used in Evo, but the street price, you can afford to use 6 amps.
http://shop.store.yahoo.com/allsellelectro/audam200watd.html
http://shop.store.yahoo.com/allsellelectro/audam200watd.html
Bel..AVo 200.2, Musical Fidelity A3cr, YBA 2hc, Pass X150