The T-128 closest to my house also doesn't have ASC branding on it. It was installed around 2006.

If you want to see an older T-128, go to Greendale, WI. That one was put up around 2000.

BNCO started making sirens during WW2. ASC's site shows a photo of some Mobil Directos (gas driven) being made.

The 10-12 electric Mobil Directo was released after WW2, though.

Yes, ACA did make a huge order for Saudi Arabia in 1992. Then (as I mentioned in my first post) they went bankrupt shortly afterwards.

They ordered 200 sirens.

Think I found the real Hormann link, too. http://www.anthonydavisdesigns.com/BaseAlert/about.htm

Basically, a siren that's fine tuned/well designed to achieve the dB output it really produces. Modifying the design even slightly (drill a hole in an Allertor horn, spin a Screamer rotor backwards, etc.) will mess it up entirely. An example of non-precision (badly designed) siren is the Federal 500...

What was the lawsuit over the P-10?

Yes, I checked my emails from Jim about Excel/on, and you are correct about it being called "Excel" for the first part of the name, but it still ended with Systems.

If it was before 1980, it wouldn't have been a P-50. Maybe you're thinking of a 500AT.

ACA was really a subdivision of Biersach and Niedermeyer Company. ACA was started in 1968 by Jim Biersach to revive siren sales that had dropped off under BNCO (their Mobil directo's popularity was very low at this time). ACA produced a full line of high precision sirens intended to suit each and ev...

Yes, the correct name in PN20. They were made from about 1992 until the Tempest line came out.

Surprised to see that 1000T hasn't been fixed yet. You'd think it'd be repaired/replaced by now.

Erm, T-128s never go that high pitched.