So if my cabs are indeed 4 ohms, then that may definitely have been the problem. (discontinuity) Okay, just checked (on Sweetwater, PRS doesn't list impedances), both the 4x10 and the 2x12 are 8 ohm nominal. So that should not have been the problem. But if there's something wrong with the 8 ohm jack (what could that possibly be -- transformer?), then I can take two of them and run them on the 4 ohm jacks, yes? (Assuming it's just the jack -- if it's some sort of impedance issue, just running one 8 ohm cab off of the 4 ohm jack should yield the same results he gets. I bet that was an 8 ohm cab (it was a Marshal 4x...er, something, slant, so probably 4x12. (discontinuity) Yeah, just checked all the Marshall cabs at that store are 8 ohm nominal.
I'm going to sleep on it. But I really don't need it.