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This gets back to the original question posed in this thread, which has been asked and answered. Older Onkyo receivers from that era are not capable of properly decoding DTS-HD MA 2.0 audio tracks to anything other that straight two channel left-and-right stereo. There is a quirk in the...

These Onkyo receivers can apply Dolby ProLogic to nearly any 2.0 format - Dolby Digital, Dolby TrueHD, PCM, DTS. The only format that it cannot do this for is DTS-HD MA 2.0.

Right, it’s not frequent but there are a few discs where it’s hardcored as separate left and right channels and there’s no way to steer it due to how it was authored to disc - but it’s so rare that it’s not really part of what you were asking about, so my apologies for the detour there :)

Yes, exactly, unless whoever authored the disc specifically set it for 2.0 mono up play out of the left and right channels, which occasionally happens.

This is specifically a quirk with older Onkyos being unable to decode DTS-HD MA 2.0 into anything other than straight left or right. Unfortunately the only solution is the one you mentioned: to set your disc player to decode the signal before it gets to your receiver. Your disc player should...