Ok my new center arrived today (LSiC) and it is rated at 4 ohms BUT I emailed Polk and they told me that it actually averages around 6 ohms. On the back there is a ohm switch. One is for 6 ohms and above and the other is for 4 ohms and above. Now since it averages about 6 then it must also be lower. Should I place it at 4 ohms and above or 6 ohms and above. Any thoughts?