I noticed there was a little dust cover like thing over the speaker hole on the inside of the back cover i couldnt even get air to go threw it
So i removed it now i believe my phone sounds louder i cant say for sure because i didnt test it with the same song before i did it but it sounds louder to me now Any one want to test this

 

oh i did a search and didnt find anything and in the root guide it only mentions apps to do this

theres no suction so not alot of dust would get in anyways

plus i couldnt even blow air threw it so it was pretty much blocking the sound

i guess you could think of it as a heat vent since the phone realy dosent have one