“The stream has an echo” is one of the most common messages a church tech team gets. The tricky part is that people use “echo” to describe several different problems. Some sound like a slap-back repeat, some like talking in a tunnel, and some like the pastor’s lips don’t match the words.
Here are the five usual causes, roughly in order of how often we see them, with a quick test for each.
1. Two audio sources playing at once
What it sounds like: a hollow, phasey, “tunnel” sound, or a short doubling on every word.
Why it happens: the streaming software is getting audio from two places: the feed from your mixer, and the built-in microphone on a camera (or a webcam, or the computer’s own mic). The camera mic hears the room a fraction of a second later than the mixer feed, and the two blended together sound hollow or doubled.
Quick test: in your streaming software (OBS, vMix, ProPresenter, etc.), mute every audio source except the mixer feed. If the echo disappears, you’ve found it.
Fix: use one audio source for the stream, the mixer feed, and mute or remove the audio on every camera and capture input. This is especially common after someone adds a new camera, because many capture cards bring the camera’s audio in automatically. The rule: if you’re running a console for the broadcast, kill every camera audio feed. Only the console should come through.
2. Ambient mics that are too loud or out of time
What it sounds like: washy, distant, like the service is in a gymnasium.
Why it happens: room mics (ambient mics pointed at the congregation) are great for making the stream feel live. But they pick up the band and the PA after the sound has travelled across the room, so they add delay and reverb. Turned up too far, that’s all you hear.
Quick test: mute the ambient mics for a song. If the stream suddenly sounds clear, they were too hot or out of time.
Fix: start with the level. Ambient mics are mix to taste: you want the room to sound alive on the stream, not overbearing. Bring them up during congregational singing and pull them down for the sermon.
Then time-align them, which matters more than most people realize. Here’s why:
Your board channels (vocal mics, DI’d keys, and so on) reach the stream almost instantly.
Your ambient mics hear the room: the band and the PA, after that sound has travelled through the air. Sound covers roughly one foot per millisecond (about 3 ms per meter), so an ambient mic 40 feet (about 12 meters) from the stage hears everything about 35–40 ms late.
Blend those two together and you get smear, doubling, or that hollow “tunnel” sound, even with the ambient mics at a sensible level.
The fix is to delay the board channels in the stream mix by the distance from the PA/stage to the ambient mics: about 1 ms per foot, or 3 ms per meter, so everything lands at the same moment. Fine-tune by ear: listen on headphones and nudge the delay until the doubling disappears and the room just sounds bigger. How you add that delay depends on your console. Some do it per output or bus, so check yours before Sunday, and make sure you don’t delay the house speakers by accident. The free delay calculator on Sound Tech HQ, our sister site, turns the distance into exact milliseconds and samples.
3. Audio and video out of sync
What it sounds like: the audio itself is clean, but the pastor’s mouth doesn’t match the words. People often call this “echo” because something feels off.
Why it happens: cameras and video processing take time. Video can arrive a few frames later than audio (or the other way around, depending on the setup).
Quick test: watch a recording and look closely at a clap or a hard consonant like “P” or “B.” If the sound comes before the lips move, the audio is early.
Fix: most streaming software has an audio sync offset or delay setting per source. Add delay to the audio in small steps (try 30–100 milliseconds) until a clap lines up.
4. Sound coming back into the mix
What it sounds like: a delayed copy of the service, or remote guests hearing themselves repeated.
Is this you? Probably not. For a normal Sunday stream, everything on stage should go to the stream, so there’s nothing to keep out. This only comes up in two situations:
Someone in the building is playing the stream out loud, such as a lobby TV, a phone in the booth, or an overflow room showing the online feed. The mics pick it up, and a delayed copy goes back out. Fix: turn off or mute any screen in the building that’s playing the online stream.
You bring remote people into the service over Zoom or another call (a guest speaker, missionary update or remote reader). If their audio comes into your board and goes straight back out to the call, they hear themselves. Fix: send the call a mix of everything except their own audio. Radio folks call this a mix-minus. On most digital mixers, that’s an aux with the call’s return channel turned down in it.
5. Reverb and delays meant for the room
What it sounds like: a washy, distant mix, or a clear repeat of the pastor’s words.
Why it happens: two things you set up for the room can end up on the stream in the wrong amount.
Reverb: the right amount for the stream depends on how loud your crowd mics are. They already carry the room’s natural reverb. With the crowd mics up, piling on extra reverb gets washy fast. With them low, a little more reverb than the house usually helps the stream mix stick together.
Delay speakers: if your church has speakers at the back or in an overflow room, their output may be delayed so they line up with the main speakers. If the stream is fed from that same delayed output, you’ll hear a repeat.
Fix: feed the stream from an output that has no speaker delay. Then set the stream’s reverb by ear, balancing it against the crowd mics. If your stream mix is an aux, you can control how much reverb goes into it separately from the house.
Quick troubleshooting order
When someone says “there’s an echo,” check in this order:
Is more than one audio source live in the streaming software?
Mute the ambient mics. Does it clear up?
Is it really echo, or lip sync?
Is a screen in the building playing the stream, or a video-call guest hearing themselves?
Is the stream fed from a delayed output, or is the reverb fighting the crowd mics?
More often than not, it’s number 1: two audio sources live at once. The runner-up is delays pushed too hard.
Keep this handy on Sunday morning: the free Sunday Morning Sound Check Checklist includes a livestream quick check you can run before the service starts.