I've searched already but not found the answer I'm soon to start running some cables into the walls of my lounge for the rear speakers in my 5.1 setup. Currently I have a reasonably cheap set of Sony rears, wired with speaker wire that I bought from B&Q. However, now I'm looking to hide the cables, I thought it would be worth asking about cables. Can someone explain why I should use relatively expensive speaker cable and not just ordinary solid core twin + earth ? The T+E would be dramatically cheaper per foot than even a basic speaker cable - so other than "internet hear-say" can someone tell me why I should use speaker cables?