My parents have an older camper trailer with built in surround sound. The connections are 6 bare wire pairs (4 in living room - 2 front/back, and 2 in bedroom). The old dvd/surround system stopped working and they tossed it. I am now trying to find something to replace it. What are the options for buying a new cheap (sub $100) receiver/surround system that can connect all 6 pairs?