6 channels

Hello, i am new with audio systems. I am planing to buy Onkyo HT-S3800 5.1 system. I've noticed that some audio channels are marked as 3F2R/LFE and other as 3F2M/LFE. Will this make a difference in playing? As i understand this home system should be 3F2R, becouse of rear speakers. So if i play...