Try 2. Hand Audioquest Cheetah. Excellent cable.
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I have MR-74 instead of MR-78 but both should have similar characteristics. McIntosh tuners have very high output voltage, 2.5V vs 1.0V on most other tuners. The high output voltage makes the MR-74 sounded rather forward, a sonic character that one does not normally associate with McIntosh equipments.
Instead of using fixed outputs, I suggest you try the variable outputs. You will not loose resolution using the VAR outputs but its sound will change depends on the volume setting. I think you will find a setting that fit your system well.