can't give you exact info with the bellbox for obvious reasons as I am sure you understand. just get some ear defenders and get on with it but be careful. the strobe can give you a right belt especially on a ladder.
as for the pirs I would go with aritech ev125p's if you can get them of course. they are not best looking but they are definnately one of the best. failing that go for the pyronix.
jim
April 2015