Press Fn + Display on your Meridian Remote

This should cycle the Display on your D5k Master Speaker

You should look for a display that says something like

PCM 48k
PCM 96k
MHR 48k
MHR 96k

When you see such a display on your master speaker, take a note of what it is......and then post it here

This is a better indicator of the Datastream that your Speakers are actually receiving

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