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[Sverre Hestetun]

Hello.
First of all, this is not a joke. Does someone know if there exists a loudspeaker that can produce 150dB SPL (1 meter)? I have a customer that needs this soundpressure to simulate a certain type of noise for practicing emergency situations.

Thank you.

[John Roberts {JR}]

Sverre Hestetun wrote on Wed, 18 October 2006 09:28

Hello. First of all, this is not a joke. Does someone know if there exists a loudspeaker that can produce 150dB SPL (1 meter)? I have a customer that needs this soundpressure to simulate a certain type of noise for practicing emergency situations. Thank you.

Consider a siren or dedicated alarm sound generator.

JR

[Brian Bolly]

I don't know of one that can produce that kind of SPL at full bandwidth, but if you're ok with a limited bandwidth application, a Community M4 driver on a PC1542 horn can get pretty close (140 range, IIRC).

[Michael 'Bink' Knowles]

[Ivan Beaver]

What is your freq range of interest and what type of coverage pattern are you needing?  What kind of size can he tolerate, is this a continous (I assume so because you mentioned noise) or peaks and what what is the crest factor of the noise involved?  How partable does it have to be?

That will help a lot, even though it will still be a very short list.

[Scott Hibbard]

Sverre,

Answering Brian and Ivan's questions would def. help a lot.  There are some speakers that might even be able to do this (or come damn close) within a somewhat broad freq. range not just one frequency.  Maybe not "full-range" at that level but some that come to mind are the Community Leviathan II, Community R6-51, Community RSH462, some EAW KF Series (i.e KF910F, KF920) etc.
These are "sky's the limit" devices, large, rightfully expensive and as far from the "average" speaker as one could imagine.

If full-range or "broad-range" isn't a concern, heck there's a good deal of horns out there ...

ScottH

[Brad Weber]

Not knowing the specifics of the application I will just add that in my experience special application speakers can often require a custom solution.  I have seen several government and military specs asking for a product which simply does not exist.  These applications require a custom product designed specifically to meet the spec rather than any available production model.

I believe this process is actually how some of the more outrageous production models came to fruition (along with just because they could).

[Iain_Macdonald]

Sverre,

No problem. Whelen Engineering have an answer. They supplied the national warning system for Denmark. Only a few of the speakers they produce are on the website. So you need to email them and make contact. (Danish Distributor or direct) The WPS400 will give you an idea of performance. But they do a system that has 16 drivers and I remember seeing one with 32 drivers. These are all voice capable. Also very narrow dispersion 16 driver units etc. Take note of the SPL, these can destroy your hearing very quickly.

Best wishes.

Iain.
London UK

http://www.whelen.com/
http://www.whelen.com/outdoor/4000.htm

[Sverre Hestetun]

Ivan Beaver wrote on Wed, 18 October 2006 14:05

What is your freq range of interest and what type of coverage pattern are you needing?  What kind of size can he tolerate, is this a continous (I assume so because you mentioned noise) or peaks and what what is the crest factor of the noise involved?  How partable does it have to be? That will help a lot, even though it will still be a very short list.

I'm not sure about the frequency range, but the customer tells me the noise sounds like letting out pressure from an air-compressor. White (maybe pink) noise bandlimited from approx 400 - 16k Hz.

To explain a little more, the purpose of the loudspeaker(s) is to simulate a gas leakage situation in a gas plant.

When it comes to your other questions (and the first), the best would probably be to get a recording of the noise.

I think I have to do a little more research.

Thank you.
Sverre

[Ivan Beaver]

That helps a little bit, but yousay that you want to simulate a gas leakage situatuion.  Over what area?  A manufacturing plant is generally a large area, requiring very wide dispertion.  That makes it a bit harder.

What about the size limits of this "transducer"?  At least you aren't talking about low freq, that makes it a bit easier. Is it to be portable or installed?

Where is is 150db to measured?  Up close or at a distance?  How long is this noise to be produced?  

Do they have a budget? or is that still up in the air for now?

When you have a very specific need, very specific question have to be answered.