In message , Alan writes
On the few I have fitted I have always mounted the sounder that acknowledges the keypad and pre alerts etc away from the panel, although I do use remote keypads and the panel is normally hidden. The idea being that it is easier for me to hear entrance door chimes and also it doesn't direct the intruders to the panel if they wish to try and disable it.
For internal sounders attached to the alarm output then the range of sound bombs are good, low current consumption, relatively discrete and VERY loud, you don't want to stay in the same room as them for too long.