Great projector! I honestly always wanted one especially that now I'm getting a new room and it would be a great addition to it!
Twitter: @dawidekziaja
Its pretty simple m8. Cool air is sucked in through the fan. It cools the processor and becomes warm. Therefore there is more air inside the case, so more air goes out. an exhaust fan wouldn't change that M8
Tried messing around with GPU audio settings? Change anything you think might be relevant and see if the problem is still there. Thats my usual way of troubleshooting. Its most probably a software, not hardware, problem so this might help.