Need help IDing siren.

[kswx29]

What is the second siren that starts up in this video? (around :17). Is it a Thunderbolt 1000? I never really payed attention to this recording but i think it might be a Thunderbolt. Sirens I normally hear are Model 5, Thunderbolt 1000 and 2001, which is what is heard in the video.

http://www.youtube.com/watch?v=DIQFsbRHr7U

[ver tum]

After the Model 5 starts up, there are two sirens that start up at exactly the same time. The higher pitched one is a 2001, and the lower pitched one is a Thunderbolt 1000, perhaps the one closest to your school. You can even hear the blower hum when it's pointing at you. If you listen very closely, you can even hear the 1000T that's two miles away, and possibly an STL-10. I could also hear at least one other Thunderbolt 1000 in the mix.

[kswx29]

After the Model 5 starts up, there are two sirens that start up at exactly the same time. The higher pitched one is a 2001, and the lower pitched one is a Thunderbolt 1000, perhaps the one closest to your school. If you listen very closely, you can even hear the 1000T that's two miles away, and possibly an STL-10.

This was recorded at my house, some 5 miles from my school. Closest sirens are (in order)
Model 5, 2001, 2001, Thunderbolt 1000, STL-10, Thunderbolt 1000T

[ver tum]

How far are you from that STL-10?