umm, isnt volume regulated by actual physical components? it may have numbers on the screen, but those are just relative. your actual sound amplification is probably controlled by an internal potentiometer. so if you wanted it louder, youd need to replace it by a potentiometer that allows for higher amps to the speaker. i dont think you want to do that. it's a PITA and would void your warranty.
you need to get a sound system if you want it really loud.
reminds me of the Spinal Tap amplifiers that go to 11