Actually more like help to find shop that fix speakers with reasonable price. The right speaker tend to buzz. I've did some test and found its more of the cone that the speaker itself. the cone will start to buzz due to the vibration at certain frequency, usual low . Now I know the problem but don't know how to solve it. So anyone can recommend a good shop? I'm not asking for the cheapest but at least with reasonable price for the job done. The speaker is a behringer MS40.