I bought a Harmon Kardon AVR20 about 7 years ago. Salesman sold me that and speakers and no subwoofer and I was in the surround sound business. Problem is we moved six months later and left the bookshelf speakers with house and haven't hooked up since. I want to get the system working. Have the receiver, Pinnacle center, DCM fronts. Just bought a DCM 1515 subwoofer and am looking at Klipsch SS1 or RS3 surrounds. Saw another salesman last night and he said I needed a new receiver to do it right. Is this true and if so can you recommend a brand and model that will get this all to work. Thanks from a technically challenged old dude.