When we first installed the system we put one siren in the main upstairs hall. It was of course loud, but the carpet and hall location dampened sound in rest of home.
I bought two more. And I determined the best result of terrible alarm sound in a large area was to place them on a high cabinet facing up to ceiling. One on a six foot high cabinet in living room by front door, one on seven foot bookcase in office by back office door.
Placed this way the siren sound reflects off ceiling, filling the large area with ear-splitting sound.
This works far more effectively than the first alarm siren I put on ceiling in hall area.
Give it a try. Check location. Consider pointing siren in a high location facing towards ceiling, which will reflect sound.
In our larger home the three sirens are ear-splitting through out the home.
I like the system! Batteries in sirens last about six months. Same for motion detectors. Door alarm batteries last longer— haven’t needed to replace in a year. The system reports when siren batteries are low. It doesn’t report when other sensors need batteries.
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