I've never heard of lab.gruppen amps before this month. Apparantly they haven't been available in America long, or won't be for a little bit. The fP 6400 is lab.gruppens flagship amp. (Or, at least, their biggest one.) The specs: 2 x 2300W @4 ohms, 2 x 3200W @2 ohms, 10 kg (22lbs) Live Sound Magazine tested the specs, and they all check out, with a flat response. And, in case you missed it, 22 pounds!!! Yeesh. Sure, these are designed for heavy-duty sound reinforcment, but just picture one of those bad boys driving a line of 8x10s. Now THAT'S a backline.