Lisa,
yes, the interconnects are the RCA cables.
some specialty rca cables have 3 wires in them, usually a shield and two wires or two shields and one wire. to lower noise, a lot of them connect the outer shield at one end only, to ground, and at the other end connect bothe shields or 1 shield and 1 wire to ground.
some people say that it makes a difference shield side the shield is connected to. which is why i suggested that you swap thew ends of each RCA cable around. most of these specialty cables are marked at one end, usually with some sort of marker, label, or colour.
if your RCA cables (interconnects) are silver wire based, they could be giving you a brighter sound. so if you have some old, cheap, inexpensive RCA cables around (from an old stereo or video or dvd) then try them in the place of your expensive rca cable interconnects, and see if the sound changes.