MisawaGuava

I've got a pair of Pro Media 2.1 speakers in my office at work connected to my laptop. I play music via Spotify. I have Spotify's volume at 100%, as well as the laptop's volume. When i increase the volume on the speakers from 0 to about 50%, it increases, but does not increase above that. Turning the knob from about 50% to full, there is no increase in volume.