Question Will this make difference?

[RainMan92]

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 some 3F2M sound, will this "2M " become "2F"?

 

[crazily]

I'd assume 2m means two middle. So on either side of you instead of behind. Likewise I'd assume that if you then took those middle speakers and put them behind you it'd make any sort of positional audio sound kindof off.