Headed out to Lakewood today to record the only confirmed working, non-defective siren in their system (their other sirens, 3 EOWS-612's all have issues of some sort or another and last I checked the one at the FD #1 is not working at all) before they are all replaced (including this siren). All 4 existing sirens will be replaced by 4 new sirens of an unknown manufacturer/type (bids have yet to be taken still) sometime later this year. I also got a video of it doing chimes last week (that video is on my channel in if you're curious in seeing that as well).
As you can hear, this siren has a few broken speaker drivers, hence the hissing on windup. The reason it starts out quiet and slowly increases in loudness until eventually reaching full power is because it is an older Modulator, which uses (and came originally with) the older MCP (Modulator Controller Plus) controller, which was made from 1995 until 2002, when the current UltraVoice controller succeeded it. This means this Modulator was installed sometime in between 1995 and 2002, since that was when the MCP controllers were made.
The earliest Modulators ever made (from 1990-1995) used the older MC controller (Modulator Controller), which was made from 1990 until 1995 when the MCP succeeded that controller. Unlike the older MC controller and the newer UltraVoice controller, the MCP utilizes this slow, gradual windup to put less stress on the speaker drivers over time, so the drivers and the siren would have a longer lifespan before needing replacement.
Siren Type: Modulator 6024 (first/second generation)
Location: Lakewood Park, City of Lakewood, Ohio
Controller: MCP (Modulator Controller Plus)
Installed: 1995-2002
Tested: First three Saturdays of the month in chimes, and on the last Saturday of each month in Alert. Tests are typically not weather dependent and are conducted year-round.
*The crackling in the beginning of the alert test video is rain hitting my raincoat (not the siren). I held out my raincoat over my camera like a roof so it wouldn't get all wet. It did get pretty wet, but not as much as it would've had I not done that.
https://www.youtube.com/watch?v=IvH7YYQOlyY