Then forget the Supercap and get an XPS(DR). As suggested by @davidf .
And no,afaik you can not use the Supercap to power the CDX.
Adding a Supercap to a 202/200/HiCap combo will bring no meaningfull change imho. Overkill.
Or trade in cdx for streamer ND5X2.
I moved from cds2 to streaming and couldn’t be happier.
A new world of music at your fingertips not to mention Naim radio with literally hundreds of stations, many in hidef.
Hi @primemerkava you posted this back in August, so it appears you haven’t had your current system running for very long. My advice before changing anything would be to give it more time and check the set up is correct and opitimised.
If you have a large CD collection and want to continue with that then you should go source first and add an XPS or XPSDR to your CDX depending which player you have. This will make a large difference to the amount of information pulled out of the discs and sound more musical too.
As for the amplifier or power supply changes I agree with others - a 282 would be a far better choice than adding a SuperCap.
I don’t know speakers, room size or what you usually listen to - but, if still needed, here is another voice saying: -
A Supercap will bring nothing to this system.
If it sounds good, just enjoy it as it is until or unless you get a strong urge to hear what benefit more spending can bring. Spend any spare cash this year on CDs perhaps?
If and when you do ever want to investigate upgrades, the logical step would be either (a) to add an XPS to the CDX (unless you want to change to streaming with ND5XS2 or NDX2), or (b) to replace 202/200 with 282/250 (with the preamp just beating the power amp for urgency of upgrade).
Either source or amplification upgrade should make a worthwhile difference to SQ. The amplification change will cost more - and IMHO will probably have a bigger impact. However, I would encourage you to ‘try before you buy’ even if you do get to that point.