Echo is the most misdiagnosed problem in remote work. People replace microphones, blame the app, and reinstall drivers — when echo almost always comes down to one loop: somebody's microphone is hearing somebody's speakers. Fixing it is about finding whose.
First: whose echo is it?
The counterintuitive rule: if you hear your own voice echoing, the problem is almost never on your machine. Your voice went out, played through someone else's speakers, entered their mic, and came back to you. The person who hears the echo is usually the only person who can't fix it.
So step one on any echoing call: ask "who's on speakers without a headset?" If several people hear echo and one participant never does — it's that participant's setup. Have them mute when not speaking, use headphones, or move their mic away from their speakers, and the echo dies instantly.
If it really is on your side
You're on laptop speakers with an external mic. Built-in mics sit inches from built-in speakers, and macOS's echo cancellation handles that pairing well because Apple tuned for it. The trouble starts with mismatched pairs — external mic + laptop speakers, or laptop mic + loud external speakers — where the cancellation model no longer matches reality. Headphones, even cheap wired earbuds, remove the loop entirely.
Two devices joined the same meeting in one room. Phone plus laptop in the same call is a feedback machine. Mute one entirely — mic and speaker.
An audio app is monitoring your mic. If you've enabled input monitoring in a DAW, a streaming tool, or "hear this device" anywhere in your chain, your voice is being replayed into the room with a delay. Turn monitoring off for calls.
Echo's cousin: the "bathroom" sound
Sometimes what people call echo is really reverb — no delayed repeat, just a roomy, hollow quality. That one is your setup, and it has a simple cause: your mic is too far from your mouth, so it's capturing more reflected room sound than direct voice. The ratio of direct-to-room sound is set by distance, and no filter can fully undo it after the fact.
The fixes, in order of effort: get the mic closer (halving distance roughly doubles your direct signal against constant room sound); speak into the mic's front rather than across it (placement guide here); soften the room a little — a rug and full bookshelf outperform foam squares stuck behind the monitor.
And if the reason your mic keeps ending up too far away is that you keep moving — standing to think, turning between monitors — the durable fix is coverage rather than discipline: several mics placed where you actually go, with SoundMesh switching to whichever is closest to your voice at each moment. One virtual mic in Zoom, no roomy stretches when you drift off the sweet spot.
The 30-second diagnosis order
1) You hear echo → it's someone else's speakers; find who. 2) Others hear echo → it's yours; put on headphones. 3) Everyone hears hollowness but no repeat → reverb; get a mic closer to the voice, or put mics where you go. That order resolves nearly every echoing call without buying anything — and when hardware is the answer, it's placement and coverage, not a more expensive microphone.