It would be “fever-pitch cacaphony,” per your logic of allowing anyone and every religious denomination a loudspeaker to proselytize because it’s protected by the First Amendment. ...and a de-facto promotion of religion by the municipality by way of SPOKEN WORDS through the loudspeakers.
Every club, church, civic organization, etc. would be permitted and entitled to have a loudspeaker and blare it throughout the day. Good times.
Did you miss the part where I predicated my approval upon the duration of the calls being the same as that of the bells?