Visitor

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4 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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655 Messages

10 hours ago

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

Problem Solver

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655 Messages

2 hours 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)

Visitor

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4 Messages

I think I tried switching from expert, the setting I have it on, to auto. but I’ll give that a try again the next time there’s something available on the Xfinity 4K channel. Thanks for the suggestion!

Problem Solver

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655 Messages

1 hour ago

In checking back, posts at AVS indicated that the Xi6 starting using MAT on the Auto setting while Expert continued to output DD+.  

Visitor

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4 Messages

So, probably not the problem. I’ll try switching anyway. Can’t hurt. 

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