My current sub is a Velodyne VA810 from the early 1990s. Has in internal 85Hz fixed crossover. Inputs on the back are line level and speaker level inputs. Instructions say to hook it up to the stereo speaker outputs and let it's internal crossover do the work. There is not an option to bypass the crossover and hook directly to the 3803s mono sub output. Questions: 1) To take advantage of the 5.1 capability of my new 3803, I need to hook up to the mono sub output, correct? 2) If so, is it reasonable to take that mono output and run it directly into either one or both of the line level inputs? 3) How is that type of arrangement typically handled within the AVR setup? 4) Would just scrapping this sub and buying a newer one be the only reasonable solution. Thanks!