untill this time i have always known that a 1/8 minijack cable had 3 lines, 1 for left, right, and a return line. I have recently bought a 7.1 sound blaster and it only has 3 outputs when there should b 4. when i asked y this was they said that two of the cables supported 3 speakers (black--rear l/r and left centre) and yellow (centre, subwoofer, and right centre). can ne1 explain this to me and if so tell me if theres any possiblility of being able to splice some wires to make a 7.1. naturally i am too cheap to pay for a set of decent speakers so i bought several good speakers and now cant hook them up. thanks in advace