We have a MCX8000 that’s worked about 15-20 shows. About 1/2 way though our Friday night gig, we noticed the audio level would randomly drop down by about -10dB for 2-4 seconds, then return to the normal level. This continued throughout the 2nd half of this show.
On Saturday’s gig at a different venue, using a completely different PA, everything was fine for about 2-3 hours, then once we got the levels up loud, we noticed the audio would randomly distort, then the audio levels started dropping down by -10dB again, then at one point we got what sounded like a full volume ground loop. These symptoms appeared to be changing when heavy bass was in a track. We found that tapping the console towards the rear, above the XLR outs would cure the issue, only to return once the bass hit really hard again.
We checked all of the levels in Serato and the outboard gear to make sure we were not clipping. All levels were peaking below 0dB on all gear.
Very challenging gig to get through at the end.
This board is just about a year old and has been handled gently throughout is service life. To me it seems like a loose connection inside the unit that is getting rattled with loud bass.
Anyone else ever have a similar issue?