How to determine the sound power from a night club? 3

[Clovis]

Hi, does anyone know how could i calculate the sound power from a night club? The problem is that the type of noise vary in time.

 

[ScottyUK]

A sound intensity meter? Bruel & Kjaer are one manufacturer you might want to check out.


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If we learn from our mistakes I'm getting a great education!

 

[Skogsgurra]

If the sound from a night club disturbs me, I usually go there myself. If you can't beat them - join them.

Much worse with buzzing pole-mounted transformers. Joining them? Naa..

Gunnar Englund

http://www.gke.org

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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...

 

[Clovis]

I mean in terms of methodology...

 

[IRstuff]

How are you going to calculate anything if you probably don't even have any specs on the speakers and amplifiers and building and insulation, etc.

TTFN

FAQ731-376
Chinese prisoner wins Nobel Peace Prize

 

[Skogsgurra]

Sorry for my last post. We had been discussing transformers in another thread. I see that you are new here and I hope that you do not think that we always are like that.

Do you mean to measure actual power? In watts? Total emitted power?

Or are you satisfied with decibels? At selected spots?

In the former case, I have no idea. In the latter case, Scotty just gave you a good answer. Have a look at the Bruel&Kjaer site for tons of information. They have done this from dawn of time - almost.



Gunnar Englund

http://www.gke.org

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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...

 

[MikeyP]

Do you mean the sound power from the sound system or the sound power radiated from the whole building to the outside?

M

--
Dr Michael F Platten

 

[Clovis]

I would like to calculate the sound power (Lw) from a night club in octave bands. It is necessary for me because i use ISO 9613-2 as the mathematical basis of an app i developed in a Geographic Information System (GIS) for the generation of noise maps. One of the input data in the app is the octave-band sound power of the noise source.
...by the way...its ok for the jokes guys...people from Brazil is all about fun!!

 

[Clovis]

I forgot to say i would like to calculate the sound power level from sound pressure level from measure in the study area.

 

[IRstuff]

see: thread384-282019 for a partial answer

TTFN

FAQ731-376
Chinese prisoner wins Nobel Peace Prize

 

[FeX32]

Calibrate a microphone. Go to the club. Collect data.
PSD it.

The output may or may not be useful. Depending on what the next step you decide to take may be.


Fe

 

[MikeyP]

I assume your nightclub is a stand-alone building - otherwise things might be tricky

I would suggest an intensity probe rather than a microphone. You will need to get on the roof too to measure the radiation from there.

M

--
Dr Michael F Platten

 

[Vibac]

May I add a word of caution: Noise from a night club is probably due to music, and might have a strong low-frequency content. Precise measurement of low-frequency noise/intensity (say, below 100 Hz) is not an easy task in outdoor conditions...

 

[MikeyP]

Yes, Vibac has a point. Follow the standard for intensity measurement very carefully with regard to calibration and PU index to make sure you know at what frequencies you are getting valid data.

M

--
Dr Michael F Platten

 

[Clovis]

Guys there are a lot of good discussions here...thank you very for your replies. Please keep posting info here. I am very grateful.