What pre/pro do you own that uses a C7 power cord?? I have updated the power cord on my cable box which uses a C7 connector, I can't say it did much, but colors are a bit better with it than without it.
As for DVD/CD players, all mine use good cords, I run older PS Audio Statements or Audience Au24, both seemed to smooth out the upper end and tighten bass and are worth it in my mind.
As for DVD/CD players, all mine use good cords, I run older PS Audio Statements or Audience Au24, both seemed to smooth out the upper end and tighten bass and are worth it in my mind.