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evmux Knowledge Base

How to Fix Echo When You Join a Studio or Call

Echo almost always comes down to one participant’s audio settings — and that could be yours or someone else’s — so the quickest way to clear it up is to check each participant’s audio. As the host you can make this easy: with Remote Settings enabled you can open and adjust any participant’s audio settings for them, instead of asking each person to do it.

Check these, in order:

1. A participant is not using headphones — turn Echo Cancellation ON

If a participant is listening on speakers instead of headphones, their microphone picks up everyone else’s voices from those speakers and sends them back into the call, creating an echo. For anyone not on headphones, make sure Echo Cancellation is ON in their audio settings — it removes that speaker echo. As host you can enable it for them via Remote Settings. (Headphones avoid the problem entirely, but Echo Cancellation is the fix when headphones aren’t an option.)

2. A participant is sharing their Entire Screen with audio — turn the shared audio off

If a participant shares their Entire Screen and includes system/computer audio, that audio contains the studio’s own sound — everyone else’s voices — which gets sent back into the call and echoes. When sharing the entire screen, make sure audio is NOT included in the share. If you specifically need to share a video with sound, share a Browser Tab with “Share audio” instead — that shares only that tab’s audio, not the whole studio.

3. (Least common) AI noise reduction and Echo Cancellation are both on

If a participant has both AI noise reduction and Echo Cancellation switched on, evmux shows a yellow warning that audio may sound scrambled — the two filters compete for the same audio. This is a “scrambled audio” artifact rather than true echo, so only look here once the two causes above are ruled out. The fix is to turn one of the two off — and only turn Echo Cancellation off for someone who is on headphones (a participant on speakers needs it on, per step 1).