But other devices will differ. I think 192kHz direct, 96kHz without room EQ, 48kHz with Audyssey is the current state of Denon/Marantz, but I'm not certain, and I don't know if the current upmixers limit to 48kHz. (I'm pretty certain Dolby Pro Logic II operated at 96kHz for older models).
If anyone has ability to investigate this, it would be appreciated!
Thanks to Amir for raising this point and about DSP pipeline downsampling.
This is important to me and many others who care about hi-rez music played back in our multi-channel setups.
last year out of interest I did a few tests at home with my Marantz AV7705:
~ From my Dune HD media player I fed the Marantz with a 96kHz 2-ch music FLAC which I know has lots of hi-frequency content going beyond 30kHz;
~ I hooked-up the Marantz's front-right analog pre-out to one of the analog pre-ins of my Presonus Audiobox interface;
~ I sampled it at 96kHz (the max sample rate capability of this interface), and recorded 24-bit WAV files into Audacity at 96kHz.
~ then I analysed the resulting WAV files using Audacity.
I concluded the following:
~ Marantz's
digital Tone Control setting (which only works on the L & R stereo channels!) correctly
preserves the high sample rates.
~ However, Marantz's
Graphic Equalizer function (which works on any/all channels)
downsamples the audio to 44/48kHz.
~ Applying a
Bass Management crossover (I use a 5.1 speaker setup) on its own did
not appear to downsample the audio (I would need to re-check);
~ As for
Dolby Surround, again I would need to re-check, but this on its own did not appear to downsample the audio.