I am looking at a refurb HK 325 7.1 receiver. Although there are outputs for a left and right surround back, I only have one surround back speaker and adding a second is not an option due to room configuration. Does anyone know if I can just connect my one surround back to either of the surround back outputs with favorable results? If not, I will probably end up purchasing a Denon 1803 or 2802 (6.1s). Thanks!