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Federal Signal Sirens

Model L
Similar to Sentry's F-2, except with a larger "collar" behind the horn
Sample video: https://www.youtube.com/watch?v=JbAGM-qwcFU   
Fedelcode Model 1
Easy to identify due to the rainshield and skirts being very close together, sounds like a slower and lower-pitched STH-10
Sample video: https://www.youtube.com/watch?v=Cei6wFPuOzY     
Fedelcode Model 2
Quite similar to the regular Model 2, but from the earlier days
Sample video: https://www.youtube.com/watch?v=_U_mX_JzzLU    
Type Mach 5
Somewhat like 2 Model 2s stacked on top of one another, sounds fairly close to a Model 5 or 7.
Sample video: https://www.youtube.com/watch?v=YZNQaSGGwmc     
 
STH-10
12 horns, has a high-pitched sound and often a long wind-down
Sample video: https://www.youtube.com/watch?v=hEOP-UdzFug  
STL-10
A lower-pitched version of the STH-10 with fewer horns
Sample video: https://www.youtube.com/watch?v=4eEoiC9LgbQ   
Model 5 and 7
Largely identical twins, mostly down to motor horsepower
Sample video: https://www.youtube.com/watch?v=HzKZ0_fQr9I
Model 2
Pretty high-pitched, has an extra skirt under the rainshield
Sample video: https://www.youtube.com/watch?v=1myTsHAIvYc
Thunderbolt 1000 and 1000T
From the company's early days as Federal Sign and Signal, easily identified by their square horns and horn supports, resembles the 1003 and ACA Hurricane 130. 1000 is single-toned and thus higher-pitched, 1000T is dual-toned.
Sample video: https://www.youtube.com/watch?v=35OLwfb3YPE
Thunderbolt 1003
Much easier to tell apart than the other two due to solenoids towards the back of the horn, can do high-low and alternating wail tones in addition to alert and attack.
Sample video:
https://www.youtube.com/watch?v=tFLoakBdfYA
Thunderbolt 2000
Very rare gas-powered siren, largely identical to 1000 and 1000T.
Sample video: https://www.youtube.com/watch?v=gQLKXKCXfpY
RSH-10/Thunderbeam
Very unique design, has a rotating metal disk that bounces sound off it
Sample video: https://www.youtube.com/watch?v=ryWj-0EZhd8
SD-10
Shaped like a soda can that's been crumpled inwards
Sample video: https://www.youtube.com/watch?v=Ph_zeE9L1_A 
XT22
Identical twin sirens with 2T22 lacking the solenoid boxes on one side, both sound identical
2T22: https://www.youtube.com/watch?v=3IIY3zQvIT8 
3T22: https://www.youtube.com/watch?v=nILuu_--G3s
2001-SRN
Started with a short round back and no battery backup, came with the rotor mechanism from Thunderbolt, didn't change much over the years
Sample video: https://www.youtube.com/watch?v=fhsc6lnj1oM  
Equinox
Prototype for what would be the 2001-130, has a sound similar to the T-128,  didn't sell well due to poor performance, basically only identified with "EQUINOX" sticker
Sample video: https://www.youtube.com/watch?v=Ph_zeE9L1_A 
2001-130
Modified from the SRN, rotor mechanism got reduced
Sample video: https://www.youtube.com/watch?v=Ph_zeE9L1_A 
Modulator Series
Digital speaker drivers, up to 8 400 watt cells with the bottom cell being mostly support, names are from number of active cells (1004 has two cells with 1 being active, 2008 has 3 with 2 being active, etc), largely similar to Whelen WPS 2800 and 2900 series, especially with functions
Sample video: https://www.youtube.com/watch?v=kON2ThgCAJg
508
Newest in the lineup, somewhat like a cross between a T-128 and the 2001 series with the sound being closer to a T-128
Sample video: https://www.youtube.com/watch?v=Qcbgb_wNUqc 
Eclipse 8
Meant to replace the STH-10, greatly resembles that siren but with square horns, similar to the T-121.
Sample video: https://www.youtube.com/watch?v=LOmGqEtncEI