I have always wondered about this so I thought I would bounce it off ya'll. I'm using an Aguilar DB680 pre-amp. It has a gain knob and a master knob. I know what the gain knob is for so no questions there . My question deals with the master knob on the pre and the master knobs on my power amp (Stewart World 2.1). Would it be better to dime the power amp and set the over-all volume by using the master knob on the pre-amp? Should you dime the pre and use the level knobs on the power amp to control the overall volume? Somewhere in between? I have found that I like the tone a bit better with the master on the pre-amp at about 2:00 to 3:00 and then I control the overall volume with the power amp. I know there are issues such as s/n ratios that come into play and you need to get a certain level of signal coming from the pre to maximize the power amps capabilities. Thoughts? Anyone? Beuler? Beuler?