Hi everyone I bought a pair of Polk Audio S 60 s and a center channel S 35 for my Onkyo Model:TX-NR686. At first I was going to buy th RTi A 7 but they were out of stock at the moment on the store. So I decided to buy the S 60. Any big difference between this speakers? I am using two old Polk Audio satellites for surround and my living rom it’s around 15’ by 20’.