My experience, is that devices are a little more susceptible to the basic LCR parameters of a cable than the naive impedance math tells us to expect.
The effects of intereconnects and speaker cables tend to go from dark, with imaging, to bright with less imaging.
I also believe that cables are terrible tone controls and as such overpriced.
Best to get something neutral and good like Mogami or pure silver, shielded cables from Parts Connexion and spend the rest of my time and money with room acoustics.