I bought a Multimedia Speakers 2.0 (Juster, model "active 85") and noticed (after playing music at a loud volume for 2-3 days) that sound starts to have distortions and the volume of right speaker was very low. Also, the bass were less intense.

Since I had the same problem on my old speakers (200W) after 2 monts of use, I wonder how soon they get ruined and what kind of brand have better resistance and quality for an intensive use.