Reply to Perplexing sound quality issue with my digital set up in club

Hi everyone
I've recently been playing in a club in Tokyo with my digital set up.
One of the big observations was the difference in sound quality between my own gear and that of the clubs.
To be honest I am really disappointed that my digital kit doesn't deliver the clean sound the the clubs pioneer CDs and mixer achieves. I really want to know if anyone else has had this problem and what solutions you've found.
I'm running Traktor + Audio 4DJ (routed into one of the pioneer mixer's channels) + VCI100 + mixing with WAV files.
Some people have said that you need to invest in high end USB and audio cables. Can this be true or is there something I've missed? No matter what I do with the club's pioneer mixer and it's eq's I get a wooly sound.
Such to the point that I might ditch my kit and focus on the CDJ set up.