If you are using the cables that Pioneer provided, the first thing I"d do is to change those cables out with some molded, shielded cat6 cables. the cat6 standard isn't necessary, but the cost difference is negligible.
I use ones like this:
http://www.amazon.com/gp/product/B000S54EYU/ref=as_li_ss_tl?ie=UTF8&camp=1789&creative=390957&creativeASIN=B000S54EYU&linkCode=as2&tag=rtimaging-20