There is no winner in volume wars. First casualty is the singers voice straining to be heard, then your practice location, then the band starts fighting and is lost because everyone is fighting over practice volume.
In-ear monitors and electronic drums for practices. Everyone has their own volume, practices are easier, there is no load in except at gigs, location choices are plentiful and comfortable, and you get to keep your ears.
Pride gets in the way though I know, someone in the band is playing as a stress release and the volume is part of their therapy or they have to have their effects and their sound etc etc blah. Bring a Digitech, it is close enough for government work and for band practice. The loud folks can still turn themselves up in their own phones without killing the band, without straining the vocalists voice, and without forcing everyone to spend hard earned money on amps they have to store and haul around just to be heard over one guy that won't play with the team.
Practice and play loud at home and at gigs, rehearsal doesn't have to be that way. That video above is the best advice I've heard for a practicing small band.