Just installed my new x10 system. Pleased so far except for the volume of the alarm. I would like to have volume similar to a car alarm if that is possible. Will two or three powerhorns achieve this? I have two stories and I am figuring two horns downstairs (since that is where a likely break in would occur.....again) and the SC1200 console and one more horn upstairs. Does that sound about right? Any suggestions?