Since no one here ever seems to get recordings of the good old sirens , especially SD10's here is one for you guys... Recorded tonight for a 18:00 test. A nice sounding SD10 and if you listen closely you will hear a Model 5 in the background on the wind down.. Also a model 7 at the end of the recording from the next town over...
http://www.longislandfirealarm.com/WPFD-SD10.wma