Hi folks, pretty new player here (under 1 year) and so far have only used Combo's. I started off with an SWR LA Series 12 and have since moved on to an Ampeg B-100R. I love the Ampeg tone Im getting right now out of my bass and volume isnt really an issue since I dont play gigs yet, but my amp gets plenty loud for a club/bar type situation as far as I can tell. What Im wanting to know basically is, can someone give me a run down on benifits of using separate head and cabs, and maybe some general info like what a pre-amp is for and does? I have no idea what compression is either and I hear that one a lot. I understand the basics of having separate amp from cab, IE can use different brands together combining features ect, but is there something else to it? Anyhow, any light shed would be appreciated. Thanks!