OK, I didn't get any other feedback here but a few of the cable manufacturers responded to some questions I had -- pretty much everybody agreed that the wiring I had done years ago was not optimal and could cause damage to the amp. The insert-cable solution (while working, per se), was called...
Thanks ando, definitely agree. At this point, as bad as I hate to do it, I'm leaning towards re-wiring using a new jack plate, shouldn't be that hard but I need to understand how much power the new cabinet would handle.
I'm looking at this part...
First off, thanks for all the comments on this board -- you guys have all helped me tremendously through the years for all kinds of issues!
Short version: I think I need a stereo Y-cable for speaker-level loads, anybody know of a cable manufacturer that makes those? Cabinet has a single, TRS...