Been moving amps around, inviting all kinds of trouble. In the process found both fuses blown on one 20.1 panel. Replaced 'em and that took care of it.
The other panel has been acting up all night. Midrange OK, tweeter is silent. Shortly after the HF is OK but the mid panel quits. Then both quit, but I can hear faint, scratchy music coming from the Xover. Switched speaker leads and suspect panel tweeter starts working, but not the mid, fed from the same source.
Bass panel(s), which run from a 2nd amp, are fine. Next step is to send the bass signal through the tweeter/mids. Fuses in McCormack amp are fine, no blue smoke.
Anyone got a clue?
UPDATE: Now it seems no signal is getting to the mid/highs. Jumped from the speaker jacks to a known good speaker, got nothing. Now it seems to be upstream. Crap.