Nothin' fancy. My Pwave has a USB input; I use it at my computer. The cool thing is that the Griffin combines a soundcard with a Tripath module. I am running a pair of JBL HLS-610's flanking my 19" Samsung monitor (these are the lil' JBLs that Corey Greenberg raved up in Audio Magazine a few years back). Not a high end system by any means, but superb sound for a PC rig.
The amazing thing about digital amps, in my experience, is the bass. I previously had these guys hooked up via a 100 wpc reciever, and while the little Pwave won't play as loud, the bass is subjectively better. Not heavier, mind you, or subjectively louder, but more solid. In fact, I used to think the bass of the JBLs was a bit soft, but it's stouter than I'd previously thought. The midrange is also very clean & enticing.
The Griffin was the "digital flavor of the month" a while back. The T-amp is probably a better value, as it's a lot cheaper (albeit without the benefit of performing as a good soundcard), but in all likelihood they both use the same chip. I think the power, etc is identical.
