Received wisdom is that for long runs you must use balanced ICs.
Still, also check out these:
Finding a specific cable
I saw a cable ad in one of the promotional emails that Audiogon sends out. Probably it was sometime in the last 6 months. They were flat, black speaker cables with a multi wire woven geometry. They looked to be a couple of inches wide (ea). Can anybody give me a lead on the name or brand or.....