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#435069 - 01/06/20 06:38 PM saw an article about the loudest sound..
MatManhasgone Online   confused
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Registered: 05/06/14
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Mojo.. you have your work cut out for you to beat that one. ie. how many active LFR's would it take ???
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#435071 - 01/06/20 08:08 PM Re: saw an article about the loudest sound.. [Re: MatManhasgone]
Mojo Online   content
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Registered: 01/21/07
Posts: 7008
What an interesting article. I knew about Krakatoa but I never imagined it was that loud.

You need 51 active LFRs each fed with 4100 peak Watts.

172dB at 100 miles is 277dB at 3 feet. I made the simplifying assumption that SPL would attenuate by 6dB for each doubling of distance.

One active can produce 126dB at 3 feet given 1 peak Watt.

The SPL at 3 feet produced by n actives is given by:

SPL = 126 + 3*(n-1)

For an SPL of 277dB at 3 feet, solving for n gives 51.

Since each active requires 4100 peak Watts to produce that SPL, over 200KW are required.

I think Ian ought to try it. If he immerses them in Lake Muskoka, he can produce a tsunami. smile


Edited by Mojo (01/06/20 08:16 PM)
Edit Reason: Messed up formula
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A-LFR/1000-8 & 2/500v4x2
1000-3,1500-3
100,160,QS10x2,800,M5x2,M2/3/50v4
had v2;v4 FOC rock
Nx maybe

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#435072 - 01/06/20 08:39 PM Re: saw an article about the loudest sound.. [Re: Mojo]
craigsub Offline
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Registered: 12/15/03
Posts: 1954
One acoustic watt is 120 dB - 4 acoustic watts is 126 dB.

If a single Active can deliver 4 acoustic watts, or 126 dB, with 4100 watts of electrical power to the speaker, it would take the same power per speaker through 1 quadrillion actives to hit 276 dB. This is, of course, assuming we are in a 4 pi environment.

Ian's gonna need a bigger factory.
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LFR1100 actv, LFR1100, M100, M50, VP180HP, VP150, 3xEP800, M3, EP350, ADA1000-5, ADA1500-4 + 1500-6

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#435073 - 01/06/20 08:42 PM Re: saw an article about the loudest sound.. [Re: MatManhasgone]
Mojo Online   content
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Registered: 01/21/07
Posts: 7008
Oh yeah? I've never heard of the term "acoustic Watt". Is that the spawn of an acoustic volt and an acoustic amp?

My number was within the margin of error. laugh
_________________________
A-LFR/1000-8 & 2/500v4x2
1000-3,1500-3
100,160,QS10x2,800,M5x2,M2/3/50v4
had v2;v4 FOC rock
Nx maybe

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#435074 - 01/06/20 08:48 PM Re: saw an article about the loudest sound.. [Re: Mojo]
craigsub Offline
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Registered: 12/15/03
Posts: 1954
Mojo - each 10 dB increase requires another ten TIMES the acoustic watts:

1 Acoustic watt is 120 dB
10 is 130
100 is 140
1000 is 150
10,000 is 160

SO ... add another 11 zeros to get to 270 ...

1,000,000,000,000,000 Acoustic watts is 270 dB.

Make more sense now?

And admit it - you had plans on taking over North America with 51 actives. laugh


Edited by craigsub (01/06/20 08:51 PM)
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LFR1100 actv, LFR1100, M100, M50, VP180HP, VP150, 3xEP800, M3, EP350, ADA1000-5, ADA1500-4 + 1500-6

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#435076 - 01/06/20 09:06 PM Re: saw an article about the loudest sound.. [Re: MatManhasgone]
Mojo Online   content
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Registered: 01/21/07
Posts: 7008
I admit 51 sounded way too practical to be true. I did math without physics like accountants do numbers without business. smile

I need to understand the theory behind an acoustic Watt. Unlike Ian, I can't study while grilling my tuna and making a stir-fry.
_________________________
A-LFR/1000-8 & 2/500v4x2
1000-3,1500-3
100,160,QS10x2,800,M5x2,M2/3/50v4
had v2;v4 FOC rock
Nx maybe

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#435077 - 01/06/20 09:28 PM Re: saw an article about the loudest sound.. [Re: Mojo]
craigsub Offline
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Registered: 12/15/03
Posts: 1954
The traditional method for referring to an acoustic watt is per square meter, and it is directly related to the pressure applied. This is why one acoustic watt - which does not sound like much - is powerful to our ears, and lethal to them as well.

Another measurement is across a one meter sphere, which would measure 107.5 dB - think about it, it's a lot more square footage.
_________________________
LFR1100 actv, LFR1100, M100, M50, VP180HP, VP150, 3xEP800, M3, EP350, ADA1000-5, ADA1500-4 + 1500-6

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#435078 - 01/06/20 09:35 PM Re: saw an article about the loudest sound.. [Re: MatManhasgone]
Mojo Online   content
axiomite

Registered: 01/21/07
Posts: 7008
While I ponder that, check out my active tuna in walnut natural satin.

_________________________
A-LFR/1000-8 & 2/500v4x2
1000-3,1500-3
100,160,QS10x2,800,M5x2,M2/3/50v4
had v2;v4 FOC rock
Nx maybe

Top
#435080 - 01/06/20 09:42 PM Re: saw an article about the loudest sound.. [Re: Mojo]
craigsub Offline
connoisseur

Registered: 12/15/03
Posts: 1954
Great - now I am hungry to go along with being boring.
_________________________
LFR1100 actv, LFR1100, M100, M50, VP180HP, VP150, 3xEP800, M3, EP350, ADA1000-5, ADA1500-4 + 1500-6

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#435083 - 01/06/20 09:49 PM Re: saw an article about the loudest sound.. [Re: MatManhasgone]
Mojo Online   content
axiomite

Registered: 01/21/07
Posts: 7008
Whaaaaaat? What could possibly be more interesting than preaching about acoustic Watts?
_________________________
A-LFR/1000-8 & 2/500v4x2
1000-3,1500-3
100,160,QS10x2,800,M5x2,M2/3/50v4
had v2;v4 FOC rock
Nx maybe

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