<exasperated>
Well, my (dodgy) DSP33 has been working perfectly for three weeks, until last night...
Following a couple of recent posts, I turned on my (dodgy) sub again. No hum! Great I thought and commenced a full calibration at the first opportunity. I got all of the levels, distances and phases sorted out and then started on MRC.
Then (groan), after the second MRC measurement, MConfig/G68 went wacko (3 seconds of hash from the speakers) and hung. I had to re-boot my PC to kill the MConfig process.
Second time around, apart from poor S/N on the sub measurement (consistently 33dB, needed 36dB), everything was going fine until... When it came to the rear left MRC test tone, no sound. I checked the speaker, power cycled it, and repeated the MRC measurement. Nada. I can hear the normal very quiet hiss, but I can't even get the calibration test tone out of it. I gave up in a huff and went to bed.
I can think of two possibilities:
1) The G68 settings got corrupted.
2) The DSP33 is dead.
To check (1) I cleared settings from the front panel wizard, Typed to 0, and then re-uploaded my MConfig settings, but that didn't sort it out. I forgot that I could simply flick the L/R switch on my other rear to see if the G68 is putting out a left rear channel. Will check this evening.
</exasperated>