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Federal Signal Warning Sirens

500 Series
500AT Visually, it bares a resemblence to traditional desk or floor fans but with the blades replaced by a cone in the center. When sounding, it bares a striking resemblence to the Allertor
Video https://www.youtube.com/watch?v=y20LsWQ9TCY
500 DH-TT 500 DH-TTs are notable for having two horns that rotate together when the siren is operating in the same manner ias emergency vehicle lights. The sound it produces is reminiscent of a Tempest 135.
Video https://www.youtube.com/watch?v=FNBG35QF3QU
500 SH The 500 SH is quite similar to the 500 ATK but has additional supports inside the horn, making it loosely resemble paddlewheels. When sounding, it bares a resemblence to the 2001 series.
Video https://www.youtube.com/watch?v=nTlIOqlD9rI 
DSA Series
Info Much like the Modulator Series, the DSA series is a speaker array system capable of a variety of tones and varies in appearance based on how many speakers are there.
Video https://www.youtube.com/watch?v=J-hszgMNz_s
Info A unique siren in that unlike the other sirens both inside and outside of its production line, this siren features a spinning flat piece of metal that reflects the sound off it as its spins. This allows it to be omnidirectional without having horns.
Video https://www.youtube.com/watch?v=x9OfCMybjPA
Sterling Series
The M-10 has great resemblence to the M-5 apart from the shape of the two horns. Otherwise, it features the same double horn shape but has a 10 horsepower motor inside, hence the name.
Video https://www.youtube.com/watch?v=UWWEhzWizzo
Sterling M-5 The M-5 bares much of a resemblence to the M-10 but has a lower pitch due to having only a 5 horsepower motor.
Video https://www.youtube.com/watch?v=WT1hi8gcPls
Sterling N-5 Unlike the M-5, M-10 and Little Giant, this siren is unidirectional.
Video https://www.youtube.com/watch?v=U9OJD8m0Jc8
Little Giant
As the name might imply, the Little Giant has bigger horns than the others but is generally still smaller. Its tone tends to resemble that of a 2001 SRN or Model 5.
Video https://www.youtube.com/watch?v=14Il4y4LIOY
STX Series
STH-10 The Standard Tone High (STH)-10 is an onnidirectional siren with 1 row of 12 horns. As the name implies, it has a high pitched sound but tends to have a very long wind down.
Video https://www.youtube.com/watch?v=kyITDMZf670
STL-10 Unlike the STH-10, the STL-10 has a low pitch and only 7 horns.
Video https://www.youtube.com/watch?v=EXTe7Mzqyrk
Modulator Series
Modulator Each member of the Modulator series is capable of the following: Alert, Attack/Wail, Alternating Wail, High-Low and Speech. They only differ by the number of speaker cells attached to the pole.
Video https://www.youtube.com/watch?v=vLl_4ZQYk2I
Model Series
Model 2 A Model 2 siren has three metal skirts on it, which helps it be differentiated from a Model 5, which has only 2 skirts. It can do Growl, Alert and Attack tones much like the Model 5 but has a lower pitch than the Model 5.
Video https://www.youtube.com/watch?v=6CgBW_xzeaY
Model 3 The Model 3 is identical to the Model 5 and 7B apart from being smaller. As the name implies, it produces 3 horsepower.
Video https://www.youtube.com/watch?v=lk52csLwMag
Model 5 Apart from its smaller number of skirts, a Model 5 is pretty similar but has a higher pitch.
Video https://www.youtube.com/watch?v=Ze9aYC2JoOQ
Model 7B From a visual standpoint, there is little difference between this and a Model 5. However, the 7B is actually smaller and produces 7.5 horsepower.
Video https://www.youtube.com/watch?v=HPixqLqy3Hg
XT22 Series
2T22 The 2T22 is an omnidirectional siren with 12 horns on top and 10 on the bottom. It's identical to a 3T22 except for its sound pitch, less functions and lack of solenoid boxes.
Video https://www.youtube.com/watch?v=GdXANZqiu6w
3T22 The 3T22 on the other hand has more functions, notably high-low and wailing fire. It can be identified mostly by the two solenoid boxes under the rows of horns. Internally, 3T22s also have two dampers, which each block the air on one set of horns at a time, allowing the high-low tone to be produced
Video https://www.youtube.com/watch?v=vco6gZPjPbg
2001 Series
2001 DC Perhaps the earliest known siren in the series, the DC was generally only identifiable thanks to the lable on the siren's gearbox.
Video https://www.youtube.com/watch?v=80PKflKai00
2001 SRN It is unknown where the 2001 name came from but the siren is very common when it comes to communities. Generally, it is among a few sirens picked to replace the Thunderbolt or another outdated siren and is most known for its slow rotation and various sound functions. Earlier versions had a rounded back but in either case, the company logo was never really seen until its later releases. It was generally only identifiable by the lack of the company logo and the label on the gearbox under the horn.
Video https://www.youtube.com/watch?v=0HWntxq0EWc
2001 SRN-B The SRN-B is virtually identical to the 130 apart from the label on the gear box.
Video https://www.youtube.com/watch?v=KkuSomYg8es
2001-130 The newest version of the 2001 series, this siren has mostly just a higher sound output (130 decibals).
Video https://www.youtube.com/watch?v=A9pIu3mEbbM
Thunderbolt Series
Thunderbolt 1000 The Thunderbolt 1000 is a single-tone siren that also has the same two tones as its identical twin the 1000T. However, being only one tone, it has a higher pitch than the 1000T. Much like the 1000T and the 1003, it has become outdated as its era was way back during the Cold War. It is frequently seen being replaced by another siren.
Video https://www.youtube.com/watch?v=A2Tv4vIglFg
Thunderbolt 1000T A Thunderbolt 1000T is a dual-tone siren but is virtually identical to the 1000 so it may be tricky to spot apart from the label on its blower box. Its tone can be considered more ominous due to the lower pitched sound it makes in either alert or attack/wail. 
Video https://www.youtube.com/watch?v=d9rRSY0dRIU
Thunderbolt 1003 The 1003 is the easiest siren to identify of the three due to the bow-tie at the back of the horn. This houses the solenoids, which in turn powers the siren's high-low function. When sounding, it is mostly a high-pitched siren unil it winds down. Since it has the high-low capability, it can also do what is known as "wailing fire" or using the wail and the high-low tone together.
Video https://www.youtube.com/watch?v=V-FWTQYzH_4