If you must buy cables, try these
http://www.anticables.com/home.html
I'v been running these lately. They are around 10.00 ft. for a stereo pair, terminated in spades. For banannas there is a little extra charge I think. Extraordinary speaker wire for the money. No shortcomings and they don't get in the way of the music at all. Little bit of a break in period though. I think they are a big step up from standard multi strand speaker cable and probably give the expensive wires a run for the money, although I'm not one for expensive wires. In my system they replaced Bedrock. Try to fix your wires if there is nothing seriously wrong with the sound.