4-channel media file suffers a 3 dB decrease with respect to the original audio levels

New Here ,
Jun 10, 2021 Jun 10, 2021

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In the performance of post-production tasks, we sometimes export the same audiovisual content, with the same container format, in two different audio configurations:

 

  • A two-channel stereo version (L-R) to be used for example from studio playback applications.
  • A four-channel stereo version (L-R / L-R) to be used in the continuity / broadcast system, typical of the Digital Terrestial Television format.

 

Within this process we have verified that the 4-channel version suffers a decrease of 3 dB with respect to the audio levels of the sequence from which it was exported, a decrease that in the case of exporting to two channels does not occur.

 

That is, if we export a reference tone modulating at -15 dB, in the case of the 2-channel version it will maintain that level, but in the 4-channel version all tracks will modulate at -18 dB. This fact occurs regardless of the room or equipment that is used.

 

Any ideas or clues?

Thanks in advance

TOPICS
Audio, Error or problem, Export

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Adobe Community Professional ,
Jun 10, 2021 Jun 10, 2021

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This is due to the Pan law: Pan law - Wikipedia

 

In Adobe Audition there is a Preference setting for the Default Panning Mode for this issue, iow to make exports not to to export with a 3dB decrease but there is no equivalent setting in Premiere Pro. The workaround some use in Premiere Pro is to just add 3 dB to the master to compensate.

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