never had to use one, but just wondering how a preamp affects your main amp. Does it boost the power output of your main amp to the watts of the main amp plus the preamp? Say, for example, I have an amp that puts out 350w, and I hook up a 350w preamp to it. Does that make the output now a total of 700w (assuming all the ohmage is correct)? Also, can you use another regular bass amp as a preamp? Say I have an Ampeg head, could I run a GK as a preamp, combining the tone and power of both amps? Maybe I have it all wrong, so please correct me if I do, but how do you know how much power you can push through your main head with a preamp without running the risk of blowing up your head? Sorry if I sound ignorant, just trying to get a handle on the whole thing. Thanks!