1. Most people nowadays use the Prayer App on their cell phones to remind them of the prayer timing.
2. A loudspeaker was never necessary to announce the timing of prayers. In the 50's we did not have electricity or the loudspeaker in our Mosque in the village where I
grew up, and almost all adult males showed up for the prayers on time.
3. In rural communities, in Pakistan, the women folk generally do not go to the Mosques and like to hear the local Imam's Khutba on the loudspeaker.
4. It is nice to have and use a public address system to conduct religious ‘Khutba’ within the confines of the Mosques.