I have often, since I was a little girl, suffered from some callers with a bad or awful voice, chanting completely out of tune. Let alone if it is too loud.

Back in Cairo, the moazen (person calling to prayer), of the nearest mosque has one of the prettiest voices! kinda makes you wait for the call to prayer instead of wanting to plug your ears. The government or the neighborhood, designate a resident in each area, and assigns them to call for prayer. Some others like to do it voluntarily.

Now I'm blessed in Doha too, I am working on the client's side. I wait daily for the noon call for prayer because of the spiritual voice of the moazen.

For the record, Prophet Mohammed, Pease be upon him, had his fellow companion Belal chant Azan every time, because it is not repelling, on the contrary, as he described, it was "enchanting".

Also note that the tone and tune vary from one country to the other. It is not like the national anthem, if you know what I mean.

Sorry for the bad experience.
Salam