My volume is very soft too but I havent removed the screen plastic..But how does that affect the volume since the speaker is at the bottom? Sorry for my noob question

Sorry for being off-topic. But I just want to ask any iphone users here experience having the bad condition of speaker? Where if you open some song, u can hear the 'exploding" or 'bursting' sound from there speaker.

And sometimes i also feel that the volume is too soft despite having turn it to the max. And i tried installed this thing called volume booster but no difference