Reply to Wiring Help

Hello,
I just got a KRK Rokit 5 and I am having some issues when it comes to wiring it up. I mostly use it with my computer but on occasion use my Traktor Kontrol S2 on it. I started first with a simple 1/4" to 3.5mm cord (Hosa Mono Interconnect 3.5mm TRS to 1/4" TS)there was often a bit of distortion (fuzziness) when I listened at louder volumes. Now it set myself up with a 1/4" to two RCAs (LiveWire TRS-202) then those into a Y cable into 3.5mm (LiveWire YRA-154) and I can only hook one half the RCAs together or I lose all bass (lows). I'm pretty confused to say the least. Any help would be greatly appreciated.

THANKS!