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I've recently acquired several interesting speakers and speaker/strobes - a Simplex 4090-90, an Atlas SVT-72, and a Wheelock 806+WS-24VDC. Also featured in this video is my Wheelock ET-1010-WS-24DC, which I've had for a while now. The speakers are being fed audio from a Bluetooth amplifier.
A bit of backstory about why the Atlas speaker is on a 4903-9101 - My second elementary school's gym and auditorium both had 4903-9101's with Simplex 2902-9711 (or -9713) speakers, which were also made by Atlas and have a similar form factor. They played a rapid pulse tone followed by the message in this video: • FIRE ALARMS GOING OFF ...
And now, for the time-honored tradition of timestamps:
0:00 - Intro
0:12 - Simplex 4090-90 + Simplex 2903-9001
1:15 - Atlas SVT-72 + Simplex 4903-9101
1:59 - Atlas SVT-72 - Rapid Pulse & Alternate Message
2:31 - Wheelock 806+WS-24VDC
3:24 - Wheelock ET-1010-WS-24DC
3:58 - Bonus Footage: 806 & ET-1010 - Simplex Hi-Lo
4:38 - Conclusion