If a professional with experience at breaking into banks wants to come take your stereo, I'm sure he knows how to do it without tripping your alarm. The idea of the inside siren is to scare the bejesus out of some inexperienced kid, and make him leave. When the alarm goes off, he knows his presence has been detected. Chances are, he won't come back later to try again. He'll try another house.
Alarm systems.
Knowing the investment most of you folks have, I am sure there are some here with knowledge of alarm systems for your home. I know it isn't directly related to audio, but my qestion is in regards to saving my hearing. So that's close enough. I am thinking that I should have them mount the loudspeaker for this thing in the attic vs. inside the house where they want to mount it. Seems like anything you can hear from 1/4 mile away should be as far away from my ears as possible. Any other things I should worry about? Ideas?