Cary offers variable sampling rate players, controlled via the remote so you can chose parameters from the listening chair. I'm thinking that Wadia also offers this feature?
Spectral used to demo a player at the CES which had front panel switch selectable filtering & sampling modes.
If you want to gloss over some of the gory details on lesser-quality recordings, you can easily build filtering into any preamp that has a tape loop. I use selected interconnect cables as filters, simply connecting the tape output jacks back into the tape input jacks, then switch in the tape loop to filter the signal according to the cable's characteristics. For example, a lower-end Cardas interconnect provides a smoother somewhat rolled-off less resolving effect. You can chose cables to whatever sonic effect you desire. If you have two tape loops available then you have even greater flexibility.
Spectral used to demo a player at the CES which had front panel switch selectable filtering & sampling modes.
If you want to gloss over some of the gory details on lesser-quality recordings, you can easily build filtering into any preamp that has a tape loop. I use selected interconnect cables as filters, simply connecting the tape output jacks back into the tape input jacks, then switch in the tape loop to filter the signal according to the cable's characteristics. For example, a lower-end Cardas interconnect provides a smoother somewhat rolled-off less resolving effect. You can chose cables to whatever sonic effect you desire. If you have two tape loops available then you have even greater flexibility.