Okay, If I've got an amp head (lets just say a Valve Junior), can I run it into pretty much any speakers as long as I match up the impedances?
As long as the impedances are matched and the cab can handle the watts being pumped into it.
yep, that's exactly right. thing is, it'll sound much nicer through actual "guitar" speakers due to the frequency response. Full range ones tend to hiss a bit...
Alright, thanks guys!