I am currently using some cheap digital coaxial cables, and i get some humming problems sometimes. I want to buy some really nice cables, I noticed that 2 boutique rca interconnects are cheaper then one boutique subwoofer cable. Can someone explain to me the difference? I am currrently using two subwoofers at the moment using a monster y-splitter at the pre out and two generic cheapo digital coaxial cables. I think they are 75 ohm, but i am not sure since they are so cheap. Sometimes my subs will hum really loud on rare instances, and the bottom sub (I have them stacked) does not switch off standby mode, itll turn off.. then quickly back on. I dont know if its the sub, if its because its below another sub, or the cable. I was thinking about buying RCA interconnects for sub cables, which is perfect for me since I need two of the,, and they are cheaper. can some eplain if it is safe to do this and will the performance be effected?