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Thread: Siren Speakers

  1. #1
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    Default Siren Speakers

    What actually determines how loud a siren speaker is?

    The new low profile / pancake type speakers seem alot quieter than standard speakers do. Any info?


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    As far as I know the speakers are rated in total watts ie. 100 watts or 200 watss output and the actual decibel range total such as 125 db. I have even seen a new one that is operated in the sub-woofer range to act like a thump box that most kids have in their cars to set up a bass resonation to vibrate into the cars. I think that the db range is preset by the factories. Perhaps a search of Code 3, Whelen or any company that makes the sirens will produce some further results.

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    Default OK, It won't let me post a new thread

    No hijack intended but I can't seem to post a new thread.

    I just read preliminary specs on a new truck. They call for a Cummins 425 HP engine with an Allison 3000 transmission. I, somehow, thought that this engine required a 4000 transmission. Any thoughts out there.

    Pete
    Pete Sinclair
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    IACOJ (Retired Division)

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    Quote Originally Posted by pete892 View Post
    No hijack intended but I can't seem to post a new thread.

    I just read preliminary specs on a new truck. They call for a Cummins 425 HP engine with an Allison 3000 transmission. I, somehow, thought that this engine required a 4000 transmission. Any thoughts out there.

    Pete
    Some of the L blocks (ISL xxx) can be cranked out to 400 for use in fire apparatus. I was just pawing around in Cummins' web site. I didn't see anything higher than 400 in ISLs there. In ISMs they go from 400 to 430, but all of them look too torquey for the 3000 trans. I don't know if they can hold the torque back and/or bring the HP and torque up slowly in order to stick the 3000 behind it. This is stuff you can do with electronics. It's also why I keep saying, don't just look at the hp and torque numbers, look at the curves.

    Stay safe out there, everyone goes home!

    You gotta wonder just how long that 3000 will live.

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    Forum Member MemphisE34a's Avatar
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    Default

    Quote Originally Posted by lvwrench View Post
    As far as I know the speakers are rated in total watts ie. 100 watts or 200 watss output and the actual decibel range total such as 125 db. I have even seen a new one that is operated in the sub-woofer range to act like a thump box that most kids have in their cars to set up a bass resonation to vibrate into the cars. I think that the db range is preset by the factories. Perhaps a search of Code 3, Whelen or any company that makes the sirens will produce some further results.
    Just curious, doesn't sound as loud from where??

    My experience is that they are quieter in the cab because more sound is being projected foward. Go stand out front. They're pretty darn loud.
    RK
    cell #901-494-9437

    Management is making sure things are done right. Leadership is doing the right thing. The fire service needs alot more leaders and a lot less managers.

    "Everyone goes home" is the mantra for the pussification of the modern, American fire service.


    Comments made are my own. They do not represent the official position or opinion of the Fire Department or the City for which I am employed. In fact, they are normally exactly the opposite.

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    Quote Originally Posted by MemphisE34a View Post
    Just curious, doesn't sound as loud from where??

    My experience is that they are quieter in the cab because more sound is being projected foward. Go stand out front. They're pretty darn loud.
    Definitely not as loud..standing outside the cab....must be something in the construction/technology.

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    Default

    I've got a low profile Whelen composite that is considerably LOUDER than the FS100 it replaces. T.C.

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