Gain structure, the boring foundation under every good mix
May 6, 2026 · by Matt · volunteer guide, mixing
Most of the audio problems we hear at churches are not EQ problems or compression problems. They are gain problems. Somebody set the preamp at the wrong level, and every fader after that is fighting it.
This is a short, applied guide to setting gain at the preamp for a volunteer who has never been formally trained. It is not a textbook. It is the version of the conversation we have during a coaching session.
What gain actually does
The preamp gain knob on your console is the very first thing in the signal chain. It takes the tiny signal from the microphone and brings it up to a level the console can actually work with. Set it too low and you have to push everything else to compensate, which raises the noise floor. Set it too high and you clip the preamp, which sounds bad and cannot be fixed downstream.
How to set it
- Pull the channel fader all the way down. You will turn it up later.
- Have the source make sound at the loudest level it will hit during the service. A drummer hits the loudest part of the drum part. A singer sings the loudest line in the loudest song.
- Watch the input meter on the channel strip. Slowly bring the gain up until the meter is hitting roughly minus 12 to minus 6 dBFS during the loudest moments.
- If your meter shows red ever, you are too hot. Back off the gain.
- Now you have headroom to work with. Bring the fader up and start mixing.
That is it. Not exciting. But it is the foundation of every good mix.
The most common mistake
The most common mistake we see is gain set so low that the fader has to be all the way at the top to hear the singer. When that happens, there is no room to push them up during a chorus. Everything sounds quiet and tense.
If you find yourself running channels at +10 on the fader, stop. Check your gain. It is almost always low.
When in doubt, write it down
After you set gain on a channel that works, take a photo of the console or write the values down. The next week, the band might be different, but the gain values for your specific microphones in your specific room are usually pretty stable. A starting point that is close to right beats starting from scratch.