The set-up of the room doesn't really allow for another speaker on that wall. I was looking at the owners manual for a 7.1 Onkyo, which suggests that if you are using only 5 surrounds to connect one of them to the Left surround back and leave the Right surround back terminal empty. Do you think this would work on the HK also? If it would have a negative impact on the sound, maybe we should consider a 6.1 system anyway... We will be using the system mostly for movies, but also some music. We aren't kids anymore, so we don't really need wall shaking sound.