It may not be your cables. Unless components are properly isolated from internal/external vibration, they won't provide a rich harmonic structure. If that is covered (it seldom is) then look at your speaker cables, but in a different way. They act as antenna for RFI/EMF, and other junk noise that comes out of the speakers a bright sound. Walker Audio makes a great product for this. To learn more about tweaking, check out www.audiotweakers.com
Please help: Speaker wire ?
I just purchased a JMlab Electra 905, and a Nakamichi receiver AV-10. The 905 is a little bit bright, so I've looked for a kind of speaker wire that can make the speaker sound warmer a little bit. My budget for a pair (bi-wire)is no more than $350 (I can buy used ones). Thank you very much. Tranle