I have the exact same situation but I purchased two 30 ft lengths of Cobalt Cable on EBAY. Supposedly , the speaker cable is not supposed to coil, loop, or fold for optimum sound quality but when you have an extra 10 feet of cable, this is kind of hard to avoid.I have the 30 ft cable laid out as best I can and I can not hear a difference between the two speakers. I don't think that at 20 and 30 ft. it makes much of a difference anyway. Only at much longer distances, or so I have read.