I speak from experience when I say if you do not like the sound of your speakers, no amount of break in, changing cables or components are going to help. 8 years ago, I bought a very highly regarded pair of expensive speakers. They sounded God awful from the get go. I replaced everything in the system from amp to front end components, cables, power conditioning, etc. At the end of the day, I had a much more expensive system that still sucked!
I was too adamant to believe that the highly reviewed speakers that everyone raved about could be the culprit. Finally I saw the light and dumped the speakers for a big loss and went back to my older speakers. Never, ever again.