I agree with Slappy, except that I think that you've already done it...backwards! I suspect that the Marantz has a much warmer presentation (and more perceived bass) simply because its top octaves are rolled compared to the more neutral NAD, and that has you cuddled up in its warm 'n cozy presentation...most of the time.
So try a fast, linear interconnect like a Blue Heaven or Pro Silway MkII. If still too laid back I'd return to the NAD or save some money and wait for the cheaper NAD 521BEE and maybe put a Harm Tech Truthlink on it like I probably will in November. Linear but not TOO wide open.
Probably easier to start by replacing the Monster with the Nordost or Harm Tech and maybe my PCK13Q+G power cord for a cleaner, linear presentation as well (RSVP), in the event that the culprits are just a cheap rolled off cables. If it's still too laid back for you then get another front end if necessary. The cables will still probably be fine for any CLEAN-topped CDP. Have fun. Ern
So try a fast, linear interconnect like a Blue Heaven or Pro Silway MkII. If still too laid back I'd return to the NAD or save some money and wait for the cheaper NAD 521BEE and maybe put a Harm Tech Truthlink on it like I probably will in November. Linear but not TOO wide open.
Probably easier to start by replacing the Monster with the Nordost or Harm Tech and maybe my PCK13Q+G power cord for a cleaner, linear presentation as well (RSVP), in the event that the culprits are just a cheap rolled off cables. If it's still too laid back for you then get another front end if necessary. The cables will still probably be fine for any CLEAN-topped CDP. Have fun. Ern