The problem with the speaker system

[Kazimir6170]

Good time. Tell your story .
At home I have a column Sven HT-435, and recently they have started fonit.
More precisely, only the sub woofer produces the background , and, at times , so that they themselves can not sleep Satellites feel fine.
Acoustic change the system? If so, what to take? Recommend Nakatomi, how good they are ?
Thank you.