I was using a friend's cab for a gig last weekend. When I was sound checking my rig, I came up on my Master volume a little too fast. I got some sharp feedback and immediately turned it back down. I came to practice the other day and it seemed as if I had lost a bit of power/volume. It also seemed to be a muddy, kind of farting out. Did I blow a speaker in this cab or does it sound like maybe another problem? I couldn't tell any issues during our set, but I was also lined in through the house PA with the Sansamp so I wasn't hear the amp honestly. I run through a power conditioner with an Ampeg SVT-4 Pro and a Tech 21 Sansamp RBI (through my FX chain). I was using a 90s Ampeg SVT 810 that has done well on the other occasions Ive used it. I was running only Power Amp A (625 watts max) and the RMS on the cab is 800 watts. The impedance was right. Would turning up my Master too fast blow it?