not impresed with my system

You haven't mentioned the type of music you listen to. I'm finding more and more recent CD's are recorded and mastered so poorly that I've stopped listening to them, even on my mid-range setup. Sometimes the better the system, the more it shows the shortcomings of modern CD releases.

I don't know much about your speakers, but I doubt the CD is the problem. I think the CA 840 is an excellent player (unlike AudioFeil), and the law of diminishing returns means you'd need to spend vastly more to hear a big difference.

It’s likely the speakers. Years ago I had the BP...something’s (the biggest floor standers at the time around 1991). They were very "big & powerful" speakers, but to me the bass was way too bloomy and the midrange unrefined. I went the opposite direction and purchased some ML electrostatics and was very pleased with how much the music “opened” up. You may want to consider some planner or electrostats, unless deep bass is your preference.

Def Tech? Well you can do better, and speakers will be the biggest advancement you can possibly do at this point, however yes the most costly and difficult as well... I owned those speakers, okay, but not what I call good for most music, fine, but not blow you away fine, you have equipment that eclipses them, so I suggest getting all the performance you are holding back in the end of the chain by replacing those speakers seriously.

Forget about tweeking with new cables or room treatment etal.
Your source and/or speakers may be the problem.Try to audition
others,one at a time with your existing components and cables.
Everyone would love to have a life like system for under $25K
Rarely can it be obtained