I'm a newbie here, my first post. What a great site! I just ordered my first power amp and cabinet. Always used combo amps before. My question is this: how should the relative levels of the pre-amp and power amp be set? That is, should the pre-amp output level be relatively high and the use the power amp level to set the volume, or the other way around? I'm told that the Stewart power amp had great "headroom", which I understand in a general sense, just wondering how best to take advantage of it. FYI, I'll be using a SansAmp PSA rack pre-amp, a Stewart World 1.2 power amp, and an Acme B-2 cab. I've heard the Acme is power hungry, so I plan to use the Stewart in bridged 4-ohm mode. But I would be nervous turning up the Stewart all the way for fear of damaging the cab with all that power.