It's outdated info. The AL/Alertronic series was discontinued in the mid-2000's and was replaced by newer I-Force and to a lesser extent, although I would consider it to be a direct replacement, the E-Class. The rotating siren with four throats, AL-4000R/RE-1600/AR-1600/*fill in the blank here*, was discontinued a little earlier than the other sirens I think. It didn't make much sense to keep the rotating unit around when the T-128 was pretty much equal to it in terms of output.
As far as the Alertronic 5000 is concerned a few units were made and sold, but ACA switched to the Alertronic 6000 soon afterwards due to the 5000's design. It was a big siren that could catch the wind pretty easily. They streamlined the design with the 6000. Ultimately the change made for a better siren.
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