I can't hear my Galls street Thunder siren model...

Question

I can only hear a little bit of sound kind of a whining noise from the inside of the siren itself. It was wokring fine and the 100 watt speaker was outputing the sound for about 5 mintues until all of a sudden it stopped. all connections are good. what else? the speaker cannot be blown because its brand new and its what the siren calls for. (100 watts) Can anyone help me?