Are any of these CD carousel CD players have sufficient sound quality to be considered near audiophile level?
Short answer, no. I have a SONY cdp-205 200 disk changer. 10 years old, never had a problem with it. I always liked the sound of it but knew it had some faults.
Fer instance, whilst playing some celtic tunes the tin whistle and ulien pipes,spelling wrong I know, sounded like a bag of pissed off cats. So in the interest of my own education I bought the Burson low jitter clock and installed it.
33.something Mhz. clock. Well, to say the difference was startling is a vast understatement. The aforementioned bag of cats turned out to be pipes and whistles afterall. Choral songs actually had distinct singers singing. So you get the idea. A 100 buck clock improved the player tremendously.
Next I added separate power supplies ,+ and - 15 volts, for the op amps and socketed LM4562's. Lots of bypassing etc., not much of a change but I felt it was worthwhile. I guess it did help a bit but not as much as the clock change.
OBTW, the original clock crystal was the size of a grain of rice, no kidding. So the long answer is, if you like the sound of your changer than upgrades are fine. If not then chuck it or use it as a garage machine.
Audiophile level? These are 200 to 300 buck carousels. Some upgrades and they sound decent. A nice Shanling or Marantz they will never be.