So I bought a stereo system of a friend who has left the country and it works great and everything, but the first thing i noticed was that all the speakers were playing the same thing, its one big box in which the bass comes out of, and there are 5 seperate speakers. 1 central, one right front, 1 left front, 1 rear right, 1 rear left. I was wondering why when i play songs with 2 seperate audio trakcs for the right speaker and left speaker that each wasnt doing it. they would play both channels together out of all speakers. So there is an option on the big box that plays bass (can i get the correct name for this please) and there is a mode option. So i click on it and i can scroll through 4 options. F: , A: , C: , S: . Can you tell me what these mean? I toggled the levels of them abit on all of them just to get a guess on what they do. I have come to the conclusion that the S has something to do with the bass, it goes up when i turn it up. I figured that C was the central speaker. But the others i have no idea. The only thing i have seen strange about these settings is that i have been able to almost completely tune out the guitar track of songs, and sometimes even the vocal tracks so that its purely instrumental, can you guys define these letters please. I need help bigtime setting this up the best i can. Thanks in advance