Why do we need PA system to prayer? Does the God not hear our voice without PA ?

It's necessary for the believers to convince - but not primarily others, rather themselves, that they believe. It's also a kind of territorial marking, in a way, because primates are territorial animals.

Genuinely confused here. I don't know anyone, of any religion who uses a PA system every time they engage in personal prayer.

If you're talking about praying in front of people, then surely that's so other people can hear and join in with said prayer, rather than so the deity they're praying to can hear it?

@AlmondSauce Muslims do that here a lot of mosques have speakers that are loud but low resolution. A stream of whining like prayer noise comes out for quite some time. It's called a minaret.

To be honest Christians bothered me more. Every Sunday they wake up a whole block on 9:45 with ramming that bell for 15 minutes. And than in the service there are less than 10 people. Time to use an app people...

@hjk101 Yeah, I get that it can be annoying as a call to prayer, or to a church service - but that's not prayer itself surely? Unless I'm horrendously missing the point.

@AlmondSauce I am not sure about the Christianity but we have a mosque nearby and it's annoying sometimes when you are trying to sleep or in a meeting. My point is whoever wants to join can go to the temple,church or mosque you don't need to shout on PA. Anyways you can not conver a large area by PA.

@unskilleddev Yeah, agree with that.