Sound broken when high volume and bass

My speaker is Harmon Kardon Onyx Mini

It can work nicely when in low volume, however when come to high volume and especially song with great bass, the sound will broke. I dont know how to describe the sound, high volume and the sound cracked and the bass feel bad too, in total just feel uncomfortable to hear the sound.

Can someone help me, would like to know what is the problem with it.