Speakers cool but small defect

I recently received these speakers, I am very satisfied for the moment.
The parcel is well packaged, arrived earlier than expected (as always, is to be expected small delays at Amazon), and all the better :).

The speakers do a good sound, even at max there is absolutely no sizzle.

The only flaw: not adjust the bass level.
[HS] There is a small software called pulseaudio-equalizer available in Ubuntu, which can adjust the bass (50Hz, 150Hz 300Hz, etc.) The bass is the lowest HZ. [/ HS]