there's several volume controls on any computer. one of them is the amp volume setting for the speakers, which can be adjusted using the buttons on your laptop.
besides that there's also windows volume mixer, that has its own volume setting meter. on top of that, depending on where you getting sound from, some programs have built-in software volume controls that get applied on top of windows and amp volume control.
So you really have to check 2-3 places before you can actually max the sound level of the speakers.