This post is only for the one person searching for this issue – it’s probably not for you:
I’ve got an issue that started recently (possibly when updating my M1 MacBook Pro to macOS 15 (Sequoia).
The issue only happens with this particular combination of hardware/software: SM57 into my UB802 Behringer mixer, into my CalDigit TS3, dock into Zoom videoconferencing software.
With this combination, I get an odd stereo effect that sounds like (and I think is) the same mono signal slightly out of time in the left vs. right stereo channels.
- If I use the same mic/dock into any other audio app, it sounds fine.
- If I use any other mic, or even the same mic/mixer into the headphone jack on the MacBook, it sounds fine.
Today, I discovered a “fix”: The issue only appears if I pan the left/right mix on my mixer to the center. If I pan hard left or hard right, it sounds fine (even though it all gets mixed down to mono). Since it’s a mono signal from the mic (I guess getting split into stereo in the mixer), it sounds identical in Zoom regardless of the panning.
I don’t know if the ‘fault’ lies with Zoom, CalDigit, or macOS.
Hmm my first suspicion would be that there’s a realtime audio monitoring setting flipped on somewhere causing doubling. But Zoom doesn’t seem to have such a thing. Maybe take a look around in the MacOS Audio Midi settings to make sure none of the “Thru” boxes are checked?