Hi there! Well i have been searching this issue with my mbp, but i have not found any fix or help to see what is happening. The problem is that i don´t get audio from left speaker, just from right one and subwoofer, i tried changing balance, and same thing, when i move balance to the left I just hear audio from subwoofer and nothing from left speaker. i checked the left speaker when i changed the cpu thermal compound and it works. and everything is plugged in where it needs to. so what is this?? a firmware/software problem or what?? Because for me, it is really annoying to listen music/movies with just one speaker. Does anybody knows something about this? or how to fix it?? Greetings.