I just bot back from summer camp at Napowan Adventure Base in Wild Rose, WI and they recently trashed their old siren and bought an ACA screamer. I am confused because it sounded nothing like this recording of a screamer: http://www.airraidsirens.com/mp3/screamer2hp.mp3
but it sounded almost exactly like this recording of a model 7 low tone: http://www.airraidsirens.com/mp3/model7low.mp3
anyone know why their screamer is like that? they said the siren could be heard all over their 500 acre camp, if that info is of any help to you.