what IC you used?
From what I understand the rca interconnect needs to be shielded and of low capacitance.
Here's my cables: Blue Jeans Cable LC-1 Low Capacitance Audio Cable
They are indeed low capacitance and low noise. 5 IC's for under $250! This is why I just did it. I figured even if I didn't like it, I could resell them with minimal loss to someone who would re-terminate them as shorter runs (or do this myself). BTW - I like their RCA connectors better than any others I've tried.