RCA Extension Cable?

[Feltran]

I have a pair of Purities that has been sitting around for the last few months, and since I have them, before I sell them I want to try hooking them up to my computer, and see how they work as computer speakers. In order to do this, though, I need a pair of RCA extension cables (8 to 12', female to male RCA). The only ones I can find are really bargain basement cables. Anyone know where I can find some decent quality ones? Or since this will be such a ridiculous setup with overkill speakers, improper placement, etc, would it hurt too much to use these super low quality cables?

EDIT: I actually stumbled across a 6m mini jack to stereo RCA cable that doesn't require any adapters. I'll give it a try.