Quoted from Rarehero:Then there must be something wrong with your game or you are hard of hearing. My AC/DC still has stock speakers and you can crank it up to ear bleedingly loud without even trying.
My Pro has the same problem - sound isn't very loud and at the higher volume levels it sounds distorted and crackly. I've added ridiculous speakers and amps, same problem. I'm considering a new board for mine to see if that's the problem. Maybe a poorly built board. I'm not upset though, the game is still awesome and lightning fast.