Just a quick Q, is it possible the leads in the cord connecting the 800c to the extension might have been set up incorrectly reversing the phase and causing the sets to actually be out of phase enhancing the highs?
I've read of the phase check using a 9v battery on an open-ended speaker cable to see if all the speakers in a cab pop out at the same time. Is there an easy way to check the phase of speakers in a combo amp? Or do you have to open it up to get to the speaker wires to avoid putting the 9v back into the amplifier itself?

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