Latest skip ahead enables TrueHD, DTS, DTS-HD MA etc. in Plex (if your receiver supports it)

You are confused. The xb1 does support DTS-HD Master Audio. What happens is that the xb1 is doing the decoding and passes the signal to your receiver as uncompressed LPCM. No difference in sound between LPCM and DTS-HD. It's just a matter of which device
is doing the decoding and in this case it's the xb1.

What xb1 can't do yet is pass thru the DTS-HD or Dolby TrueHD to your receiver and let the receiver do the decoding. Hopefully MS fixes that soon.

Thanks for the feedback. My receiver is a Yamaha RX-V373 and it does indeed support Dolby TrueHD;

HD Audio format decoding: Dolby TrueHD and DTS-HD Master Audio; Dolby Digital Plus and DTS-HD High Resolution Audio

To Dayton; so it does appear multi channel on the receiver display but the format is PCM. Seems strange. Again, with the HDMI passthru, and the TV function it is still PCM. But if I hook my Sat receiver in directly the A/V receiver displays Dolby Digital.

[quote user="DPC"] I noticed the Blu-Ray player does not play Dolby TrueHD & DTS-HD Master Audio. [/quote]

Actually what happens is the xb1 is decoding the Dolby TrueHD or DTS-HD and passing it out to your AV receiver as uncompressed PCM. There is no difeerence in sound between uncompressed PCM and the HD audio formats. It's just a matter of which component is
doing the decoding, and in this case it's the xb1.

I agree that the xb1 should be able to pass the HD audio formats to our AV receivers/processors and let the receiver do the decoding. I hope they fix this soon.

So much misinformation here.

DTS (Dolby Digital also) is a lossy format which means it's a compressed format just like the mp3 format is. DTS-HD Master Audio is a lossless format which means it is uncompressed. Unfortunately the xb1 does not pass thru DTS-HD or Dolby TrueHD to a receiver.
The xb1 does the encoding and passes the sound as 5.1 or 7.1 PCM uncompressed.

5.1 uncompressed sounds the same as DTS-HD. It's just a matter of which device does the decoding, the xb1 or you receiver, and in this case it's the xb1 that does it, so you should use it instead of the plain old lossy DTS format.

This is not only about mixing. It is not only about lossless to lossy, it is also lossy to more lossy. For example if you think thant LPCM 7.1 (Uncompressed) is what you need then look at kHz number on your receiver. You will always receive 48Khz. So suppose
you have high quality Nirvana disk Nevermind 1991. It contains 96Khz tracks. Same with Nine Inch Nails DVD audio. You will not get same bits. So X1 alters sound and looses quality. Result - I do not use it for Bluray disks.

One more note: DTS HD is not the same as DTS HD MA:
www.bing.com/search