I am running the PCA-2 and HCA-2 in my system with JM Labs Cobalt 826 Signatures. For the first month I wasn't sure if this combo was going to pan out. Brand new stuff and needed a long break-in period. Sound was OK at best, but started to open up after the second month. I'm sure if I had just let it play nonstop the break-in would have been much quicker.
I'm using Tara Labs RSC Master Gen.1 interconnects from d/a convertor (1.5m) to PCA-2 and same model (RSC M.G.1 @ 20ft.) to the HCA-2 which sits between my speakers. These cables are not cheap! $400 & $1400 respectively.... :(
On a whim I stopped at "The Guitar Center" which is a musicians heaven for anything in his craft. I grabbed 2 pairs of "Live Wire" microphone cables, 5ft. and 25ft. for a grand total of $106.00
These mic cables are balanced design with Neutriks connectors. They do offer D'Addizio cables which are slightly better for another $60 above what I paid but I figure "this is just a test." Hooked up the balanced wires and sat down for a quick listen. The Tara's are still in place, I just used the extra output from the D/A to feed the XLR in of the PCA-2. At the amp I have to manually switch from SE to XLR.
I thought the HCA-2 to be a very good buy and it really began to sing after a good break-in but I found myself wanting to buy another amp.......maybe a nice big tube amp. Ya know that tube thing is really magical! Aww hell, at least give the PS Audio stuff a chance for a few more months I said to myslef.
Hold on a minute here!
What just happened?......Could it be that a cheap set of microphone cables just gave me what I thought was missing???
Sure enough did! this amp sounds WAY different when run in balanced mode.
If I'm not mistaken your CDP has XLR outs and I think it also has volume control too? If this is true I would suggest buying a pair of XLR microphone cables and run your HCA-2 direct from CDP. The shorter cables are only $40 a pair and can be returned if not satisfied. For $40 it sure can make a difference to you and your amp!
I certainly don't feel the need to upgrade now, but that's my system and it's reaction to running balanced mode.
* I would suggest that any PS Audio HCA-2 owner try this amp in balanced mode....especially if you have the PCA-2 pre!