OK, I think we need some clarification here. Do you seek a single player that can do everything (make everything sound good) or an additional player or another piece of hardware than can compensate for bad recordings?
If it is the former then you seek the impossible. How can one player color bad recordings and not color good recordings? I dont care how much synergy there is you cant find a player that can do both. You can find a player that compromises on both ends and make everything sound mediocre, but you cant have everything in one box.
I suggest the following. Switch to computer based audio with a USB DAC. Rip all CDs to hard drives. Investigate equalizer software that can be applied to bad recordings and bypassed for good ones. Properly implemented computers make great transports so you can concentrate on the software and DAC.
If it is the former then you seek the impossible. How can one player color bad recordings and not color good recordings? I dont care how much synergy there is you cant find a player that can do both. You can find a player that compromises on both ends and make everything sound mediocre, but you cant have everything in one box.
I suggest the following. Switch to computer based audio with a USB DAC. Rip all CDs to hard drives. Investigate equalizer software that can be applied to bad recordings and bypassed for good ones. Properly implemented computers make great transports so you can concentrate on the software and DAC.