The one with the loudspeaker is a "call" to prayer, the Bell ringing is a notification that worship is to take place and come along if you "wish", there's a big difference.
If I buy a house "near" a church that has been there for hundreds of years I have no grounds to complain about the bell ringing, especially if my house was built AFTER the church, but if I buy a house away from all places of worhip say in town and then some nice people CONVERT or Build a NEW place of worship near my existing house, and they AMPLIFY AAAAAAAAALLLLLLLLLLLLLLLLLLLLLLLLHHHHHHHAAAAAAAAA for miles around I think I would have grounds to be well ****ed off.