I can hear the difference (sometimes) between 16bit and 25bit, but not the sample frequency.
I have several gratis releases from
Chesky Records, a Grammy Award-winning independent audiophile label that focuses on
"creating the illusion of live musicians in a real three-dimensional space", and are very good at doing that.
My open back reference headphones (Beyerdynamic, Sennheiser, AKG) do show a smoothness and openness in Chesky releases, due as much, if not more, I suspect, to the equipment quality and mic techniques they use to capture the music initially.
As you know, 24bit provides about 104 dB dynamic range; 16 bit provides about 96 dB. Mathematically, the sampling rate is straight forward statistical sampling: the larger the sample size, the closer to the reality of the universe being sampled. The technical requirements to achieve that level of accuracy is the challenge, and way outside my wheelhouse, but it seems using state of the art gear, Chesky has met the challenge.
That said, as I understand it, Chesky records at 192kHz/24bit resolution and distributes at 96kHz/24bit resolution (targeted to the audiophile market). But I also have a few 44.1kHz/16bit versions of their releases, and any difference between the CD version and the same release in hi-def is subtle at best. I hear it as being a bit smoother (i.e., a function of the wider dynamic range/headroom). Maybe a $5,000 headphone brings out something more; but I don't have any intention of ever finding out.
