This sorry tale reminds me of a few times I've seen very experienced players who seem to have no "feel" for setting up amps/preamps etc. Just turn everything up, hit it hard, then maybe turn it up a bit more…same thing with some engineers - if its not hitting the red its not on,is it?
My master volumes hardly ever go past half way, and I find these modern amps that just keep getting louder past the mid-point very strange…its just not natural. Not that I'm a clean freak, its just that (for me) drive should come from the front end of the amp…the back end is for necessary stage volume, not ego. Then there's the PA.
I like the phrase painted on ears. Seen plenty of those.
To the OP - make whatever noises you fell necessary, but don't hold your breath. Get new speakers and move on…lesson learned.