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American Signal Corporation Sirens

ASC-T112
The most basic of the sirens in the range.
Sample video: https://www.youtube.com/watch?v=DdHokhStpd8 
ASC T-121
The horned version of the 112. Has a metallic look to it with narrow throats and large round horns.
Sample video: https://www.youtube.com/watch?v=nYer18edb54  
ASC T-128
One of the loudest sirens in the bunch, resembles a flower, rotator mechanism is larger than on the newer T-135.
Sample video: https://www.youtube.com/watch?v=cIeOiDrUX6I  
ASC T-135
Carried over from ACA, originally a large bucket design made from the ACA Cyclone, since redesigned to be a larger version of the T-128.
Old design: https://www.youtube.com/watch?v=dvUY4gPDyXw

New Design: https://www.youtube.com/watch?v=tswsbgxA3QM
Clarity
Newest siren in the lineup, basically a speaker siren, not widely found
Sample video: https://www.youtube.com/watch?v=2J3xOVQVlZA
E-Class
Another speaker siren, has battery backup and overall better speakers, greatly resembles the ATI-HPSS sirens
Sample video: https://www.youtube.com/watch?v=Htxh_TTeV70
I-Force/Quadren
Originally the Quadren with a design much like Whelen's 2800 and 2900 series, redesigned into I-Force with similar properties to Federal Signal's Modulator series
Quadren: https://www.youtube.com/watch?v=NNRE0nGffvA
I-Force: https://www.youtube.com/watch?v=a5gj27orKl8  
OM-Series
Rebranded ACA sirens painted gray.
Sample video: https://www.youtube.com/watch?v=ZhqIhc-av78