The Siren Board

I was looking at patents again and I found this. It doesn’t look to be any or any part of the ACA sirens we know. Anyway, here’s the pictures!
Link: https://patents.google.com/patent/US479 ... .+Biersach

Any info would be nice!

could be an early design for one of their omnidirectional electronic sirens?

Hmmm.. That gives me Hormann vibes, could it possibly be something like that?

When did Quadrens come about? This could've been a very primitive prototype of the Quadren, even if it had different "features."

Some_3t22s wrote: ↑

Sun Mar 14, 2021 1:54 pm

When did Quadrens come about? This could've been a very primitive prototype of the Quadren, even if it had different "features."

Could have been a prototype. The Quadren patent itself doesn’t appear to have any of the pictures above.

Quadren patent: https://patents.google.com/patent/US532 ... .+Biersach

Orange wrote: ↑

Sun Mar 14, 2021 3:31 pm

Some_3t22s wrote: ↑

Sun Mar 14, 2021 1:54 pm

When did Quadrens come about? This could've been a very primitive prototype of the Quadren, even if it had different "features."

Could have been a prototype. The Quadren patent itself doesn’t appear to have any of the pictures above.

Quadren patent: https://patents.google.com/patent/US532 ... .+Biersach

This could very well be a prototype. I obviously have no idea if that's fact, but it seems possible since the cell designs with their outlets are vaguely similar.

It’s an unused design whether or not it was actually made. Patents are full of these unused ideas. Read up on the patent abuse in the tech sector to see how these things work.

Not hard to understand.

This patented design actually presents significant acoustical challenges.

A plurality of compression drivers are shown radiating into a disc shaped chamber, but the wave expansion is not smoothly and seamlessly preserved from each of the compression drivers, which will reduce the efficiency of the horn loading. This design also creates the possibility for wave energy to radiate from one compression driver over to another, which would cause a great deal of loss at high frequencies due to out-of-phase energy bouncing around in the chamber and canceling output from adjacent drivers. The third issue is an issue shared by all "Manifold" compression driver systems - the acoustic load of the horn increases as more drivers are fed into one path, so the horn starts resisting the efficient operation of the compression drivers, so that a pair of compression drivers whose level would add to +6dB actually only add up to +1.5-2.5 dB - you don't get a true doubling of pressure from two sources. This has been the finding of studies of systems like ElectroVoice "Manifold Technology" speakers which load two or four compression drivers onto a single horn through an adapter.

Based on all this, I would say this patent is best left in the past, unused.