Zoom video conferencing audio stereo chorus effect with CalDigit TS3 dock

by Steven Garrity

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.

This is a recording from a Zoom call showing how my voice sounds odd when panned to the center, but fine when panned left or right.
  • 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.

 

One thought on “Zoom video conferencing audio stereo chorus effect with CalDigit TS3 dock”

  1. 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?

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