The sound is of course not limited HIFI level. Sixteen never expect so little things, especially since it is 1-way speakers. Full fat crass bass and brilliant highs are there not in it. But after the manual adjustment of the equalizer of the sound card / sound chip it still sounds a whole piece of natural and actually not that bad. The volume level I've not tested, because my 70% were already too loud.
An on / off switch, volume or tone control knob does not exist. You switch on with booting the PC. Volume control via key combination or the speakers in the Windows taskbar. Tone control as mentioned above, the sound card / sound chip.
I am fully satisfied. Good value for five star. Sound could prinzipiel a little better (but hardly at the price) - nevertheless therefore only four total.