I know its old but we just discovered it in storage and it works just fine, BUT, I can only get the 2 front speakers to work and nothing else. I really want the center speaker to work but its not. In fact, I tried the other speakers and those aren't responding either. I am wondering what I did wrong to hook it up. I connected the 2 main front speakers to the subwoofer then wired the sub to the receiver. Thanks in advance.