Just bought a new PRRI 68 online and it sounds really muffled unless I have the treble cranked up. With my Teles and Strat the treble can be around 6-7 or so and it sounds ok, but I have an ES-125 with P90s and it has to be set to 10 or else it doesn’t sound good, and I can’t even get a serviceable tone for my 335. I’ve played these amps before, although only with Teles, and never noticed this issue. I also pretty much only buy used amps, is this just part of the speaker break in process? Or is something else going on?