I'm now playing the DVD stereo LPCM version of Yes Relayer album. My player is registering it as 96khz over coax.
If I apply remaster, it registers as 192, and it clearly has a different sound.
Prior to that I played the new Jethro Tull A remaster album DVD - also 96khz - also stereo lpcm, and it will not play as anything other than 48Khz over coax, remaster at the player or not.
Anybody have any ideas why?
Not sure if my input might assist - I hope it does - but as you're mentioning both the Yes "Relayer" album (which I'm assuming is the DVD-A/CD release, which I also own), and DVDs, when referring to 96kHz and 48kHz, I thought I'd pass on an interesting bit of information which appears in the user manual of my Arcam DV137 player.
I find it interesting that physical user manuals appear to be becoming less common nowadays, but in recent years, I've found both my Arcam kit manuals useful and informative - and a Quad manual. The Arcam manual is not perfect, eg it doesn't actual mention that it is not possible to pass the audio from SACDs over conventional digital connections (ie digi coax or optical), but I hope the following bit of text copied verbatim from my DV137 manual might be of use to you, although I appreciate it doesn't give the whole story.
"Listening to DVD-audio or SACD discs
The high quality of DVD-audio and SACD discs can be realised only by using either the multi-channel analogue or the HDMI outputs. Using a conventional digital connection between your DVD player and surround-sound receiver will not allow you to hear these discs at their best, since the audio carried across the digital link when these discs are played is compromised (i.e. limited to a sample rate of 48K). This is true for all DVD players and is not a limitation of your DV137.
If you wish to use a surround-sound receiver for decoding your movie sound-track, but want also to enjoy DVDA/SACD, we recommend either the following the connection advice given above for 'multi-channel amplifier' in addition to using the digital audio connection, or using an HDMI connection to your receiver."
The only extra bits I can add to the above, is bear in mind the vintage of my DV137 (2006, ie before BD became dominant), and that my Arcam AVR350 does not accept audio over HDMI. I have therefore always used the analogue outputs for music or movie soundtracks.