Previous Thread
Next Thread
Print Thread
Rate Thread
Page 1 of 3 1 2 3
saw an article about the loudest sound..
#435069 01/06/20 11:38 PM
Joined: May 2014
Posts: 1,170
Likes: 6
M
MMM Offline OP
connoisseur
OP Offline
connoisseur
M
Joined: May 2014
Posts: 1,170
Likes: 6
https://getpocket.com/explore/item/the-s...e=pocket-newtab

Mojo.. you have your work cut out for you to beat that one. ie. how many active LFR's would it take ???


Anthem: AVM60, Fosi DAC-Q5
Axiom: ADA1500, LFR1100 Actiive, QS8, EP500, M3, M3comp, M5
Re: saw an article about the loudest sound..
MMM #435071 01/07/20 01:08 AM
Joined: Jan 2007
Posts: 10,490
Likes: 116
M
shareholder in the making
Offline
shareholder in the making
M
Joined: Jan 2007
Posts: 10,490
Likes: 116
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

Last edited by Mojo; 01/07/20 01:16 AM. Reason: Messed up formula

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated
Re: saw an article about the loudest sound..
Mojo #435072 01/07/20 01:39 AM
Joined: Dec 2003
Posts: 2,021
Likes: 1
C
connoisseur
Offline
connoisseur
C
Joined: Dec 2003
Posts: 2,021
Likes: 1
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.

Re: saw an article about the loudest sound..
MMM #435073 01/07/20 01:42 AM
Joined: Jan 2007
Posts: 10,490
Likes: 116
M
shareholder in the making
Offline
shareholder in the making
M
Joined: Jan 2007
Posts: 10,490
Likes: 116
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


House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated
Re: saw an article about the loudest sound..
Mojo #435074 01/07/20 01:48 AM
Joined: Dec 2003
Posts: 2,021
Likes: 1
C
connoisseur
Offline
connoisseur
C
Joined: Dec 2003
Posts: 2,021
Likes: 1
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

Last edited by craigsub; 01/07/20 01:51 AM.
Re: saw an article about the loudest sound..
MMM #435076 01/07/20 02:06 AM
Joined: Jan 2007
Posts: 10,490
Likes: 116
M
shareholder in the making
Offline
shareholder in the making
M
Joined: Jan 2007
Posts: 10,490
Likes: 116
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.


House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated
Re: saw an article about the loudest sound..
Mojo #435077 01/07/20 02:28 AM
Joined: Dec 2003
Posts: 2,021
Likes: 1
C
connoisseur
Offline
connoisseur
C
Joined: Dec 2003
Posts: 2,021
Likes: 1
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.

Re: saw an article about the loudest sound..
MMM #435078 01/07/20 02:35 AM
Joined: Jan 2007
Posts: 10,490
Likes: 116
M
shareholder in the making
Offline
shareholder in the making
M
Joined: Jan 2007
Posts: 10,490
Likes: 116
While I ponder that, check out my active tuna in walnut natural satin.



House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated
Re: saw an article about the loudest sound..
Mojo #435080 01/07/20 02:42 AM
Joined: Dec 2003
Posts: 2,021
Likes: 1
C
connoisseur
Offline
connoisseur
C
Joined: Dec 2003
Posts: 2,021
Likes: 1
Great - now I am hungry to go along with being boring.

Re: saw an article about the loudest sound..
MMM #435083 01/07/20 02:49 AM
Joined: Jan 2007
Posts: 10,490
Likes: 116
M
shareholder in the making
Offline
shareholder in the making
M
Joined: Jan 2007
Posts: 10,490
Likes: 116
Whaaaaaat? What could possibly be more interesting than preaching about acoustic Watts?


House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated
Page 1 of 3 1 2 3

Moderated by  alan, Amie, Andrew, axiomadmin, Brent, Debbie, Ian, Jc 

Link Copied to Clipboard

Need Help Graphic

Forum Statistics
Forums16
Topics24,940
Posts442,457
Members15,616
Most Online2,082
Jan 22nd, 2020
Top Posters
Ken.C 18,044
pmbuko 16,441
SirQuack 13,840
CV 12,077
MarkSJohnson 11,458
Who's Online Now
0 members (), 563 guests, and 1 robot.
Key: Admin, Global Mod, Mod
Newsletter Signup
Powered by UBB.threads™ PHP Forum Software 7.7.4