USB to spdif converters like the JKmk3 , Audiophileo or Offramp make a drastic change to the Mac Mini USB performance. Most USB implementations in dacs are poorly optimized compared to their spdif.
Mac Mini with one of these should match your CDT. The USB cable has little bearing on sound I found.
Mac Mini with one of these should match your CDT. The USB cable has little bearing on sound I found.