Similar Topic, I noticed recently a low buzz sound in two of my channels on my 4 Mic Recorder. Recently I have been recording with 2 Sets of Mics > Tascam 70D.
Last Tuesday, these 2 sets of mics worked fine, but last night I noticed a buzz from my Superlux s502 > Channels 1 and 2, while the Rode M5's in Channel 3 and 4 were fine. I picked up a new cable recently, and was wondering if the proximity of the Mics together on the stand could cause this buzz.....Luckily I don't mix them until post show, so I was able to Salvage the Rode M5 Mics Source from a local band. Weird, going to test them out later at home, just curious if anyone else has seen this from using 2 sets of Mics on a stand.