theroofable
Registered User
Registered User
Posts: 177
Joined: Mon Oct 10, 2011 2:11 am
Location: NJ

Re: Why are dual toned sirens no longer made?

Sun Dec 15, 2013 7:44 pm

Just FYI, I saw another thread that said the Federal 2T was discontinued in 1989. Wish they still made these!

User avatar
DJ2226
Registered User
Registered User
Posts: 1431
Joined: Sat Mar 30, 2013 3:50 am
Real Name: Dennis Seldon
YouTube Username: DJ2226
Location: Columbus, Georgia

Re: Why are dual toned sirens no longer made?

Sun Dec 15, 2013 9:45 pm

While the design of a dual tone siren can hinder the amount of sound they could put out, this doesn't really, IMO, answer the question of which sound would carry the best. The best way to test to see which type of sound travels the greatest would be to take two or more mech. sirens, one being single tone, that have the same design and output like a Thunderbolt, since the blower doesn't change between the different models (1000/1000T/1003, various port ratios), get a Db meter, and on a nice day with good weather blast the siren and take measurments. It would be easier to do the same test between electronic sirens like two older Whelens or two sirens running on FS UV controllers, because there is no change in the siren head.
Proud owner of a Model 1, SiroDrone, and sketchy MS-790.
DJ2226's YouTube Page

User avatar
Daniel
Registered User
Registered User
Posts: 4086
Joined: Sat Jun 03, 2006 3:37 am
Location: Beautiful eastern Oregon

Re: Why are dual toned sirens no longer made?

Mon Dec 16, 2013 12:20 am

With any single-tone siren, the number and shape of the ports determines both pitch and timbre. With dual-tones, there is also the harmonic generated by the musical interval produced. A typical Thunderbolt 5/6 rotor will generate a resultant harmonic buzz much lower than the two notes it produces. Different pitch intervals give different resultant pitches, some of which carry farther than others. Octave sirens like Sentry and Sterling dual-tones produce a less noticeable resultant than a fourth (SD-10) or fifth (40V2T) interval.
Lex orandi, lex credendi, lex vivendi.

User avatar
dclarkct
Registered User
Registered User
Posts: 93
Joined: Fri Jun 21, 2013 2:32 pm
Real Name: Dennis Clark
Contact: Website

Re: Why are dual toned sirens no longer made?

Mon Dec 16, 2013 2:25 pm

Dual tone has a lower SPL output but it sounds better. I would prefer the longer downrange of a single tone over the perceived quality sound of a dual tone. I am speaking of electronic sirens not Mechanical sirens.
Age 55.

Stevan Z
Registered User
Registered User
Posts: 424
Joined: Sun Dec 08, 2013 10:05 pm
Real Name: Stevan
YouTube Username: ChicagoSirens
Location: O'Hare Area Illinois

Re: Why are dual toned sirens no longer made?

Mon Dec 16, 2013 9:52 pm

Federal told me a few months ago that they are thinking of making a 10/12 port siren. Probably will look like a 508.

User avatar
DJ2226
Registered User
Registered User
Posts: 1431
Joined: Sat Mar 30, 2013 3:50 am
Real Name: Dennis Seldon
YouTube Username: DJ2226
Location: Columbus, Georgia

Re: Why are dual toned sirens no longer made?

Mon Dec 16, 2013 10:33 pm

Stevan Z wrote:Federal told me a few months ago that they are thinking of making a 10/12 port siren. Probably will look like a 508.
Got some proof there?
Proud owner of a Model 1, SiroDrone, and sketchy MS-790.
DJ2226's YouTube Page

User avatar
sirendude2012
Registered User
Registered User
Posts: 665
Joined: Sat Aug 11, 2012 1:49 pm
Real Name: Michael Borjas
YouTube Username: legomn54321
Location: Fremont, Ohio

Re: Why are dual toned sirens no longer made?

Mon Dec 16, 2013 11:57 pm

Stevan Z wrote:Federal told me a few months ago that they are thinking of making a 10/12 port siren. Probably will look like a 508.
Federal was the one that led the pack by making single-toned sirens in the mid 80s. Federal was also the one that concluded that dual tone sirens are inefficient, leading to the single tone era.


Federal doesn't even make dual-tone Modulators anymore... that are dual tone form the factory, anyway. Either way, you're telling a lie, or you're telling a lie... unless you provide the official, legitimate message form Federal stating so, or you find some kind of prototype image/new patent visualizing this.
Last edited by sirendude2012 on Tue Dec 17, 2013 12:35 am, edited 1 time in total.
THUNDERBOLT HAS BEEN SOLD

User avatar
Savage
Registered User
Registered User
Posts: 53
Joined: Mon May 06, 2013 4:29 am
Real Name: Michael Savage
YouTube Username: Thefiremansavage
Location: Omahurr

Re: Why are dual toned sirens no longer made?

Mon Dec 16, 2013 11:58 pm

Stevan Z wrote:Federal told me a few months ago that they are thinking of making a 10/12 port siren. Probably will look like a 508.
Attachments
Smells-Like-Bullshit.jpg
Smells-Like-Bullshit.jpg (18.1 KiB) Viewed 2617 times
Image

User avatar
Jim Z
Registered User
Registered User
Posts: 2237
Joined: Tue Aug 01, 2006 1:03 am
Real Name: Jim
Location: ;) or :D are implied

Re: Why are dual toned sirens no longer made?

Tue Dec 17, 2013 12:24 am

Federal doesn't even make dual-tone Modulators anymore. They hate them.
Lolwut

Stevan Z
Registered User
Registered User
Posts: 424
Joined: Sun Dec 08, 2013 10:05 pm
Real Name: Stevan
YouTube Username: ChicagoSirens
Location: O'Hare Area Illinois

Re: Why are dual toned sirens no longer made?

Tue Dec 17, 2013 12:45 am

sirendude2012 wrote:
Stevan Z wrote:Federal told me a few months ago that they are thinking of making a 10/12 port siren. Probably will look like a 508.
Federal was the one that led the pack by making single-toned sirens in the mid 80s. Federal was also the one that concluded that dual tone sirens are inefficient, leading to the single tone era.


Federal doesn't even make dual-tone Modulators anymore... that are dual tone form the factory, anyway. Either way, you're telling a lie, or you're telling a lie... unless you provide the official, legitimate message form Federal stating so, or you find some kind of prototype image/new patent visualizing this.
They told me on Facebook that they were planning to test it out.

Return to “Main Outdoor Warning Sirens Board”

Who is online

Users browsing this forum: ThatGuy2020 and 14 guests