I would seriously doubt you would gain anything. I have a Ref CD7 and it sounds much better than my DAC8. Whether playing digital files from my computer or when I tried connecting it to my CD7 and using it as a transport. The Ref CD9 is an excellent CD player, very smooth and analog. I would not try and make it more complicated.
There are things you can do to tweak it. Replace the power cord, I like Shunyata. I makes a huge difference. Replace the ARC tube dampers with Herbie's Ultrasonic RX dampers. You may also want to replace the fuse with a Synergistic Research Blue fuse.
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