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 Post subject: decibel meter.... I phone app? is it any good/accurate?
PostPosted: Sat May 21, 2011 10:57 pm 
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http://www.pcworld.com/appguide/app.htm ... pand=false
does this actually work well?


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 Post subject: Re: decibel meter.... I phone app? is it any good/accurate?
PostPosted: Sat May 21, 2011 11:35 pm 
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Silent But Deadly

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Without a traceable reference and the electrical properties of the cheap microphone, you will not have accurate results.


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 Post subject: Re: decibel meter.... I phone app? is it any good/accurate?
PostPosted: Sat May 21, 2011 11:42 pm 
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how well do those 30-40$ units do?
i know you have to pay to play, but i cant afford to drop hundreds of dollars on just this device.


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 Post subject: Re: decibel meter.... I phone app? is it any good/accurate?
PostPosted: Sat May 21, 2011 11:57 pm 
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Silent But Deadly
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to get "real" equipment it is thousands of dollars.

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 Post subject: Re: decibel meter.... I phone app? is it any good/accurate?
PostPosted: Sun May 22, 2011 11:05 am 
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Unless you work for Redjacket you will need at least 5 grand to have a meter that will capture the impulse of a gun shot.

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 Post subject: Re: decibel meter.... I phone app? is it any good/accurate?
PostPosted: Mon May 23, 2011 8:35 pm 
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rogerdemin wrote:
jimmym40a2 wrote:
Unless you work for Redjacket you will need at least 5 grand to have a meter that will capture the impulse of a gun shot.


Will thinks 140db is hearing safe so what difference does there meter make?




Actually it has been posted on other sites that at least in the UK, noise levels must be at or below 140db. THis number is apparently their standard for industrial noise as well as gun noise being safe for human hearing. So........it was not necessarly all Will's idea. Maybe someone from accross the pond would like to elaborate more on this

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 Post subject: Re: decibel meter.... I phone app? is it any good/accurate?
PostPosted: Mon May 23, 2011 11:00 pm 
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The meter they are using is a joke. Their results are not worth the 50 dollar mic they are using.

wonder what they metered this at?
http://www.youtube.com/user/RedJacketFi ... EkFBFmbGQY

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 Post subject: Re: decibel meter.... I phone app? is it any good/accurate?
PostPosted: Tue May 24, 2011 9:33 am 
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Shift1 wrote:
rogerdemin wrote:
jimmym40a2 wrote:
Unless you work for Redjacket you will need at least 5 grand to have a meter that will capture the impulse of a gun shot.


Will thinks 140db is hearing safe so what difference does there meter make?




Actually it has been posted on other sites that at least in the UK, noise levels must be at or below 140db. THis number is apparently their standard for industrial noise as well as gun noise being safe for human hearing. So........it was not necessarly all Will's idea. Maybe someone from accross the pond would like to elaborate more on this


Uk noise at work regulations since 2006, mandatory ear protection required by law must be worn at 85dB and above, this was reduced from 90dB previously.

Generally at 80dB hearing protection is provided if requested.


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 Post subject: Re: decibel meter.... I phone app? is it any good/accurate?
PostPosted: Tue May 24, 2011 12:50 pm 
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You won't be able to compare numbers with someone else, but if you want to do some comparison testing of your own, then it will give you a ballpark figure. I use SPL meter on the iPhone.

Gene


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 Post subject: Re: decibel meter.... I phone app? is it any good/accurate?
PostPosted: Tue May 24, 2011 1:58 pm 
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Silent But Deadly
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jimmym40a2 wrote:
The meter they are using is a joke. Their results are not worth the 50 dollar mic they are using.

wonder what they metered this at?
http://www.youtube.com/user/RedJacketFi ... EkFBFmbGQY


Good god that was loud. I wonder how much someone pays for something so quiet?


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 Post subject: Re: decibel meter.... I phone app? is it any good/accurate?
PostPosted: Wed May 25, 2011 10:54 am 
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Noise hearing damage is based on time of exposure too.

So, 8 hours at 100 dB might be more damage than a couple gunshots at 139 dB.

Above 140 dB, you will generally get instant hearing damage. How much depends on the time of exposure and how much over 140 dB.


To answer the OP's question- no, the iPhone cannot meter gunshots. A mic/meter setup has to have both a high enough level to 'hear' a gunshot as well as be fast enough to capture impulse noises.

With cheap meters, you are metering sound reflections, and echos, etc... not at all accurate.

A proper mic/meter setup that is properly calibrated will cost thousands of dollars even used.

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