High quality CDs

I listen exclusively to Classical.  Where are you getting your CDs from?  Maybe your system needs revamping.

  Anyway, Classical Labels that are especially known for good Sonics are, inno particular order:  BIS, Reference Recordings, Decca, MDG, Pentatone.  These labels tend to bill themselves as Audiophile, and most of them are sonically outstanding.

  The so called Major Classical labels, besides Decca, are Sony and Warner.  Like Decca, these current mastheads comprise many labels that were until a decade or so past were independent with decades long recording traditions, such as DG and Phillips (Decca), RCA (Sony), EMI , Erato, Telefunken(Warner).  Then there are the historical budget labels such as Naxos and Vox.

  DG was thought to be exemplary in the lp days, but most of the  records from their heyday show hot treble and limited bass.  Naxos and Vox always suffered from poor engineering but there are some exceptional finds there.  Sony and RCA early digital transfers could be problematic but later remasterings are usually exceptional.

  My recommendation. : It would help if you told us what sub genres within Classical you are interested in (Baroque, Opera, etc. or just name Composers) and then I and others will flood you with recommendations.  Secondly, use a streaming service to audition a recording before buying 

I will second the recommendation for BIS CD's as their CD's are very very dynamic so watch the volume control as when something starts off quietly the speaker cone can be billowing when you get a climax. you will definitely not be disappointed.

About 6 years ago I bought an Oppo 105 specifically to enjoy the so-called benefits of higher resolution SACDs/DVD-As. Turns out the 105 simply isn't that great for either SACD and especially Red book. Quite likely the transport is the biggest issue. Maybe 3 years ago I upgraded the IEC, and jumper to bypass the 110/220 switch, then replaced the power supply with an aftermarket all from Ebay. These made terrific improvements, but also pointed the finger at the transport being the chief culprit. A couple years ago I bought a Audio Alchemy DDP-1 + PS 5 and a Marantz HD CD-1 (player, but used only as a transport) to play Red book CDs and it way outperformed the 105 playing the same disc's SACD layer (using XLR outs into the DDP-1)! A couple months ago the Marantz died and I decided to get a dedicated transport (Audiolab CDT6000. I no longer use the 105, unless for a classical disc that I don't have a red book.

rapping it up, you need a high quality SACD player=$$$$$ to enjoy hi-rez benefits

hth

@rman9 
Yes, they are compatible with all CDP.  Good luck. 

As someone who listens to classical about 80% of the time, favors physical media (CDs), and is married to a well-known classical musician, I will second the recommendations of Reference Recordings, MDG, & Pentatone as companies that produce generally high-quality classical recordings.  I will add that ECM is often terrific as well, as are CSO Resound (the Chicago Symphony's label), and Channel Classics.