Visitor

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3 Messages

09/06/2026 9:24 PM

4k audio

Why is the audio on the 4K channels coming through as two channel PCM when the audio on the non-4K channel for the same program is showing as Dolby digital?

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Problem Solver

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654 Messages

8 hours ago

What box is your Xfinity source?   What device is handling your audio?

Visitor

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3 Messages

@BIslander​ 

I have X1 Boxes (Xi6-T).  I have a Yamaha RX – A780 AVR. The only problem I have receiving Dolby digital from the box to the AVR is specifically on Xfinity 4K channels. They are only sending a PCM signal to the AVR. On all other channels, the box sends Dolby digital to the AVR just fine.

Thanks!

(edited)

Problem Solver

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654 Messages

45 minutes ago

I believe the Xi6 started using Dolby MAT on 4K around the time of the Workd Cup with one of its audio output settings, either Auto or Expert, can't remember which.  Try switching to the one you aren't using now to see if that makes a difference.  My 4K boxes are XG1v4s and they don't use MAT on either setting.

(edited)

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