let me start off by telling you what receiver i have pioneer 1015tx 120w per channel....now the speakers i want ...because they are on sale ..is the Polk audio R50s the center csi25 and the R15 rears..i thought this would be a good match ,,but while reading the specs the front speakers and rear speakers are 8 ohm and the center is 4 ohm nominal...my reciever says to use 4-6 ohm speakers...is that goin to make a big diff on sound and what about mixing those speakers with diff ohms....i dont know to much about the technical stuff on speaker ohms and frequencies...all i know is i have a decent reciever and a klipsch subwoofer ..and i want some great sounding speakers to match...the R50s wont be on sale for long so any help is appreciated...this set up is for my dvds and video games.