I would stay away from warmer sounding cables and more towards faster or more revealing. Litz copper cables maybe too much of a good thing with McIntosh. Depending on budget I would look into Nordost’s Heimdall 2 or Frey 2. Local McIntosh dealer uses both of these cables and I think they work well. They tried the McIntosh cables and stopped stocking them as they felt the Nordost, for the same money was a better cable. Own a balanced Frey 2, and in my system it’s a great cable.
Cables
Roxy 54 I am a fan of your expertise on mcintosh equipment. The mc-2105 is my favorite peice, I am wondering what are your choice of cables. My pre-amps are mcintosh mx-123 and c-12000