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Pics from various internet locations
Posted: Sun Dec 02, 2007 12:09 am
by fstbolt
This is just a collection of pics I found on google.
Thunderbolt:
Looking up on a WPS-2905:
Sentry 20V2T:
(I think): Hormann Siren:
DSA in Hilo,Hawaii:
2t22 in Hawaii:
WPS-4004:
Posted: Sun Dec 02, 2007 1:01 am
by kswx29
Posted: Sun Dec 02, 2007 1:09 am
by loudmouth
thanks for posting things we can look up on our own....
Posted: Sun Dec 02, 2007 1:23 am
by fstbolt
Hey, Im just trying to donate something to the community.
althoug 2t22boy is right i should have looked.
What you think are Hormann's
Posted: Tue Dec 04, 2007 2:39 pm
by va_nuke_pe
It looks like Madahcom SPT-2117's mounted side by side to me. These are "Giant Voice" outdoor loudspeakers.
Posted: Tue Dec 04, 2007 5:31 pm
by Robert Gift
loudmouth wrote:thanks for posting things we can look up on our own.... :roll:
I like new posts of things I would not have known to look for.
Never saw that Hormann before.
I question the efficiency of their speaker design.
Seems also that the speakers should be rotated 90 degrees.
Posted: Tue Dec 04, 2007 8:08 pm
by SirenMadness
Oh, believe me, with the efficiency of Hormann's designs, you'd put your questioning on whoever installed their sirens instead!
Those speakers are extremely efficient; it is simply the arrangement that does not look that way.
Posted: Tue Dec 04, 2007 11:19 pm
by Robert Gift
I believe there will be unnecessary cancellation caused by the parallel speakers.
It also appears that rarther than have longitudinal spread, they have it vertical.
Better speaker placement and orientation would lessen cancellation.
Why are no speakers facing the other two directions?
Posted: Tue Dec 04, 2007 11:26 pm
by JasonC
Robert Gift wrote:I believe there will be unnecessary cancellation caused by the parallel speakers.
Quite the opposite...if they are phased right, they will compliment each other. Hormann engineers designed them this way. Coverage is claimed to be nearly equal throughout 360 degrees.
Posted: Tue Dec 04, 2007 11:32 pm
by va_nuke_pe
To answer your questions:
1. They are LOUDSPEAKERS, not sirens. Being directional is very desirable for LOUDSPEAKERS, not so much for sirens.
2. When they generate a tone (imitating a siren), believe it or not, they behave as omni-directional devices beyond about 200 feet away.
3. The purpose of the "somebody ran a car over the bugle" stacked horn design is to limit attenuation loss in the near field and thereby bump up range slightly - stacked, narrow beam arrays have a 3 dB/DD divergence loss, not the normal spherical divergence loss of 6 dB/DD (decibels per distance doubled) from traditional horns.
These look like Madahcom SPT-2117 speaker arrays - I am not aware that Hormann manufactures anything like this design, although they could be a reseller.