If you can be bothered to get hold of an RCA to DIN cable, you may find that it gives a small improvement, although I couldn’t say whether or not it will be noticeable for you.
You might also want to check that the grounding arrangements are correct if the CD player/Hugo is your only connected source. I’m not familiar with the Hugo TT, but with the original Hugo, the ground connection between amp and CD player would, I believe, have been broken, and this may or may not be the case with the TT.