I can think of two other issues that should be addressed - the first is that the sound that Don likes might simply be a bit too loud for the situation. There's a level at which the amp starts moving some air - and if that point is both where Don likes the sound AND is too loud for the room, then the issue can't really be fixed unless he finds an amp that gives him the sound he likes quietly.
The other issue - and one that's easily fixed - is that if Don is standing up and the amp is right behind him on the floor, he might not be hearing the volume that is the source of the complaints. The easy fix for this is to put the amp up on a chair or stool so that it's pointing directly at his head.
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