I've been spending more time with my Bass 400 through a Megoliath (a very detailed/clear sounding 8x10) and with a recent thread on soft clipping, I have really gotten into exploring the subtleties of the two preamps on this head. Input 1: Lower volume/gain, a little rounder. Slightly more focused breakup. Input 2: Bold, clear, a little more "square", higher volume. Breakup comes quick and wide. I have almost always used Input 2 (which is supposed to be the preamp from the D180... I own a D180 and find going through Input 1 has a more similar type of voicing) but am interested in using an A/B/Y switch again to have one "channel" breakup a lot more for OD/compression purposes. Anyway... killer amp. Between the two inputs and footswitchable EQ you can get a lot of sounds out of it.