.Generally the levels are determined by the drummer if the drums are unmiked(unless hes a jazzer using brushes or the like)My band rehearses with a 2ooWatt Pa pretty much three quarters up.Because im a hit em hard no finesse type drummer:).Our Guitarist has a Marshall Combo that he uses for rehearsals only and thats about half way.
Our bassist has a 300W laney World series Head and 1by 15 cab and thats on about three,Im the only one who uses earplugs(although the other two are considering it)I use Elacin plugs they cost me twelve quid and i replace them every so often.It takes out all the sharp frequencies from the crashes/snare etc and means you can rehearse without your ears ringing for ages.12 quid or hearing loss?Difficult one.