Premiere – 6 dB audio loss when using stereo files on mono tracks

Question

I've noticed an unexpected 6 dB audio level reduction when using stereo WAV files on mono tracks in Premiere Pro, particularly when exporting multichannel audio for broadcast.

If I place a stereo WAV on a mono track and select only L or R using Audio Channels on the timeline clip, the exported audio is approximately 6 dB lower than the original.

After several tests, I found a simple workaround: modify the source clip in the Project panel before placing it on the timeline.

Using Modify > Audio Channels, change Clip Channel Format from Stereo to Mono and select the required source channel (L or R). You can import the same WAV twice, configure one instance as L and the other as R, and rename them for clarity.

I verified the results using independent LUFS measurements:

The modified mono clip preserves the original level, without any gain compensation.

This is worth checking when preparing multichannel broadcast exports. I don't know why Premiere behaves this way, but the difference is reproducible.

John V Knowles · Accepted Answer

I believe this has to do with PAN LAW, which is a difficult concept to explain quickly but has to do with volume changes when dealing with mono/stereo conversions like this. Usually it involves mono clips in stereo tracks dropping -3db. Premiere used to auto compensate for this a long time ago but they decided against doing things without user input like this so they left it alone. I believe this is totally expected behavior when it comes to audio and yes the best option is to split stereo tracks into mono L+R if you need to have mono tracks vs standard.

Rag and Bone · Answer

Further to John’s reply: more discussion about the pan law here.

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