I live in Indonesia which 90% of our population is moeslim. I like live in here, people are nice and very tolerance. But, I have one question that bugging me, in every mosque in my area their using very huge loudspeaker and every prayer time, all this mosque are make a loud  prayer and make like they're racing each other that make like loud noise but not clear. My question is, is this loudspeaker are mandatory for every mosque? or only in Indonesia they do this? This is only my curiosity, 100% no offense.