I want to buy Monster Cable brand wire, that I can run through the attic so I guess it needs to be sheilded or something too. I am only going to need about 50 feet of wire to each speaker which are going to be my surrounds. My surround speakers are JBL Studio series S-36II's being fed by the HK AVR-230. Which guage wire should I get and if possible, what model number of Monster Cable is it? Thanks!!