The biggest factor in choosing either the 4s or the 8s is your room size. Based on your room size I would recommend the QS8 because they can provide more output to fill a bigger room. Other than that there will not be huge difference between the models. I have the QS4 and they are exceptional performers for both music and movies.

I’m armed and I’m drinking. You don’t want to listen to advice from me, amigo.

-Max Payne