I'm going through this and a whole plethora of things are against me......
Guitarist is the founder member, he controls the sound, he is 15 years older than the rest of us and is deafer than the rest of us. We do a sound check with him out front to set levels, then the singer goes out front to have a listen and more often than not reports that guitar and bass are killing the drums (the answer to that is turn the drums up rather than the guitars down) but then he comes back to the stage and I watch him turn his amp up 5 times in the first 3 songs because he can't hear himself. I have argued the case for monitors until I'm blue in the face. We all went out and spent big bucks on proper iem's but I'm the only one who uses them.
The bass player prescribes to louder is better so he doesn't care, the singer often moans he struggles to hear but doesn't want to rock the boat so it's left to me to be the lone voice of distention. The guitarist just ignores me and the bass player tells me to stop moaning.
To those who may say " just quit", I have been actively hunting a new band for over a year......it's not that easy.