How can I set recording levels to avoid clipped speech?

Use a short test-and-adjust routine. Select the microphone you plan to record with, put it in position, and speak as you expect to during the actual recording. Watch the input meter while you make a brief test take, then listen to it.

For GarageBand on iPhone, Apple says to lower the input level if the meter turns red to help prevent distortion.[S1] A quiet take is a different issue from a meter turning red: listen to the sample and check whether the speech is simply too quiet. The available source does not establish a universal target reading or describe how every app and microphone behaves.

Keep the important conditions consistent:

1. Choose the app and microphone you intend to use.
2. Put the microphone where it will be during the recording.
3. Speak at your normal volume and distance. Include a louder phrase if you expect to say one in the actual take.
4. Note the input-level setting, if the app provides one.

This helps make the test relevant to your planned recording. In GarageBand for iPhone, the input-level slider is available when the source supports level control.[S1] If you do not see a level control, do not assume that your app or microphone provides one; make a test recording and listen back instead.

If you are using GarageBand for iPhone and the meter turns red, lower the input level and make another test take. That is Apple’s guidance for helping to prevent distortion in that app.[S1]

If the speech sounds quiet but the meter does not turn red, first check that you selected the intended microphone and kept your usual speaking distance and volume. If an input-level control is available, adjust it and record another sample. Compare the takes by listening; do not assume that one setting or meter position is right for all setups.

For example, if a louder practice sentence makes GarageBand’s meter turn red, lower the level and repeat the same sentence from the same position. Check the new take before settling on that setting.

Use this checklist before the full take:

1. Confirm the app, microphone, and planned microphone position.
2. Record a few sentences at your expected volume, including a louder phrase if relevant.
3. Watch the meter. In GarageBand for iPhone, lower the input level if it turns red, then test again.[S1]
4. Listen to the sample: is the speech distorted, or is it simply too quiet?
5. Repeat the test after changing the microphone, position, or input level.

This is a check, not a guaranteed setting. The cited guidance covers GarageBand for iPhone, and it does not provide a universal target meter reading for other apps or microphones.