Unless your rehearsal space seats about 5000 you don't need to mic your 50 watt amp. Rehearsal should be just that. Don't try to blow everyones head off. Are you just wanting to be louder than the other guitar player? That's so rare I probably shouldn't mention it, right guys?
Get a small PA and a 58 (or better yet, a 57) and SING through the PA. Once you mic your amp, the other guy will, then the drummer.....the bass player sure won't want to be left out. Then you have a very loud band running trhoug what will probably be a very small PA. Been there, wasn't happy.
