Ok, heres the deal-o. I got a Kustom Lead Guitar Amp from school that was non functional. I fixed it with some duct-tape on the head. I have no use for it since I have a bass and it sounds distorted. My question is, Im planing on getting a Hartke 3500 head sometime in may/june. Can i use the speaker from the guitar combo till i can afford a Avatar 4X10. The Kustom combo has a open back so I can reqire it in like 5.2 seconds. But will It blow out the speaker? I plan on giving the Kustom cab to my girlfriend late this summer when she starts learning guitar. Oh yeah.... I aslo have a Fender BassMan 15B crap combo amp, is their anyway I can use the hartke on it?