Updated October 2026 · Levels and metering explained
Noise reduction often lowers the overall loudness of a recording, because it removes sound along with the noise. Restoring the level by raising the whole file also raises any remaining noise. Restore loudness with gentle gain and light levelling after cleanup, then check the final loudness against your target.
Many people are surprised when a recording gets quieter after noise reduction. The reason is simple: the reduction removes sound, and some of that sound is part of the voice. The file sounds cleaner, but it may now be below the level you need. Restoring the level is important, but it has to be done carefully, or the noise that was removed will return with the voice.
This post explains why loudness drops, how to restore it without bringing the noise back and how to check the result against a target.
A noise reducer lowers the signal in the parts it judges to be noise, and some of that signal is quiet speech or breath. The total energy of the recording goes down, which the meter shows as a drop in loudness. The drop is often a few decibels, and it can be larger with strong settings.
The reduction also changes the balance of the signal. Quiet passages may lose more than loud ones, so the difference between them can change.
Raising the whole file restores the level, but it also raises the noise that remains. A file that was quiet and clean can become loud and hissy in the same move. The noise floor rises with the voice, so the background may become more distracting than before the cleanup.
A levelling process raises quiet passages and lowers loud ones, which can reach the target without lifting the noise in the quietest pauses. It is gentler than a single gain change, and it keeps the balance more natural. Apply it with a light touch, so the voice keeps its expression.
After restoring the level, measure the loudness of the final file, not only the project. Check the true peak too, since a gain change can push peaks into clipping. The LUFS meter shows both figures for the export, so you can confirm the file meets your target.
Once the level is restored, listen to the quiet pauses on headphones. If the noise has risen, reduce the restoration gain or apply the noise reduction more gently. A slightly lower level with a clean background is usually better than a louder file with audible hiss.
A good habit is to check the level before any noise reduction, and to set a target for the cleaned file in advance. If the original is far below the target, consider whether the recording can be re-made at a closer distance, rather than relying on cleanup and gain to bridge the gap. A recording that starts at the right level needs much less restoration, and it keeps the voice more natural.
Record the level before and after each cleanup stage, in your project notes. The record shows how much each stage affects the loudness, and it helps you decide how much restoration is reasonable for future recordings.
When a client or a collaborator asks for a specific loudness, explain the trade-off. A higher target may require more cleanup, and more cleanup can cost naturalness. A clear discussion at the start avoids disappointment at the end. Agree the target and the trade-off in writing, so the expectation is clear to everyone. Revisit the agreement if the delivery format changes, since a different platform may ask for a different target.
There is a limit to how much the level can be restored without audible noise. If the cleanup was very strong, the recording may simply be quieter than your target, and the best choice is to accept a slightly lower level. Targets are guides, and a clean, natural sound matters more than hitting a number exactly.
A reliable meter confirms the level after cleanup. The LUFS meter shows the loudness and true peak of the final file, and the Noise-Free Voice Recorder can clean background noise from a recording you own. For the balance between cleanup and natural sound, read the noise reduction limits post in this series.
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Noise reduction removes some sound along with the noise, which lowers the overall level.
It raises the noise too. Use gentle gain and levelling, then check the background.
Your platform or project target, but accept a slightly lower level if the cleanup was strong.
After. The export can change the level, so measure the final file.
