Search Issue Tracker

Fixed in Unity 5.1.2



Found in


Issue ID




Audio clip volume is normalized when "Force to Mono" is enabled on a 16-bit stereo wav

Asset Import



Priority: 2Necessary for shipping a final release


Severity: 2Core functionality majorly impacted

Attached project:
- Includes 2 pairs of audio clips that demonstrate the issue.
- Notice the difference in volume between each clip and its "forcemono" equivalent, even though the source wav data is exactly the same.

To reproduce from scratch:
- Create a 16-bit stereo wav file with very low volume; import it into Unity.
- View and listen to audio preview; note the volume is low.
- Check "Force to Mono" in the clip settings and click Apply.
- View and listen to audio preview; note the volume has been normalized.

To further investigate:
- Attenuate or amplify the original clip data; reimport into Unity.
- View and listen to audio preview with "Force to Mono" enabled; note the volume appears exactly the same as in previous steps (even though the wav has been modified).

Comments (1)

  1. 08a0dbfc01a82c61b1cc7494c0d7af3d?d=mm


    May 11, 2015 06:00

    Any progress on this? This is throwing our audio levels out of whack. Some clips are way louder than expected - but only if the source wav was stereo!

    The bug was only introduced in Unity 5 when a normalization pass was lumped in with Force to Mono. Please just delete this new "feature" and restore it to Unity 4 functionality.

    If you want to keep the normalize option, add a new Normalize checkbox to the importer.

All about bugs

View bugs we have successfully reproduced, and vote for the bugs you want to see fixed most urgently.