I am planning on purchasing a RX-V750 with a Velodyne DLS4000 subwoofer. I am trying to figure out if there is a limitation on a subwoofer cable. I am planning on placing the subwoofer in the back right corner of the room (so it can hide behind a chair since it is bulky and I need to have the WAF). With the sloped ceiling going from 8ft to 13 ft I am going to need a long cable to get to the subwoofer. I think I will need a cable that is about 50 feet long. Do they make cables this long and is there a maximum length you should get so that performance is not degraded? My house was prewired with normal speaker wire and I am unable to determine how and if it is possible to hook the sub up to the receiver with normal speaker wire. I am somewhat of a newbie and any help is appreciated.