I'm trying to hook my Bose Cinemate speaker system into my Harmon/Kardon 240 receiver so that I can listen to dvd's and surround sound through the cinemate. Right now, it only plays what's showing on the televsion, even when I switch the receiver over to DVD. There are two built in rear speakers in the house which I have connected up and seem to work ok. Can anyone tell me if I'm doing something wrong or if this can even work?