Hi Fingers that is a problem I had in my early days of playing, however, it was usually to complain they couldn't hear me, Unless a band has its instruments balanced it wont get anywhere...In later years I had the luxury of playing with bands big enough to have a sound engineer and of course stage monitors where you can listen to whatever band member you want. Until that time I think that a decent moveable amp stand is the go. If you don't have an engineer, after set up get someone competant to stand at the back of the hall play a number and get and listen to advise as to individual adjustment....If your band is properly balanced anybody should be able to pick out any individual instrument and listen to it, right through the band...Having said that whatever is the lead instrument Guitar or voice that should be a
tad higher than the rest.
Regards Fenderphil