Horn Shaped Duct

Tyimo · 21st September 2005, 06:24 AM

Hi!

Only one question:

How could I calculate the Helmholtz Resonant Frequencies in a ported box, but with an exponential-horn-shaped duct???

I know only the original equation:

fh = (c/2ð) x sqrt(S/VL)

Tyimo

synergy · 21st September 2005, 10:23 AM

use horn response and model yourself a rearloaded horn

Tyimo · 21st September 2005, 12:45 PM

Yes, and I could also use MJK's Mathcad program.....

Is there any more simple way?

Tyimo

synergy · 21st September 2005, 12:59 PM

the helmholtz resonator works on the priciple that the port contains a mass of air when coupled to a chamber it resonates at a particular frequency

you could using WinISD or the like model your basic port dimensions then using the volume found work out an exponential port that contains the same volume of air

however doing that you won't be able to model the gain that comes from the flare

using MJK's sheets might actually be better cos hornresponse only calculates the response of the horn not the driver as well

Tyimo · 21st September 2005, 04:01 PM

Thanks!

I think it is a good idea!

Greets:

Tyimo

maiky76 · 21st September 2005, 04:34 PM

Hi!

Ony for your eyes:
http://www.haliaetus.com/va/haliaetus.html
ther are some AES papers, very intesting at least...
Once you read it maybe you'll change you're mind for
something else than e(x) for your port.

@+Maiky

maxro · 22nd September 2005, 01:58 AM

Quote:

Originally posted by maiky76
Hi!

Ony for your eyes:
http://www.haliaetus.com/va/haliaetus.html
ther are some AES papers, very intesting at least...
Once you read it maybe you'll change you're mind for
something else than e(x) for your port.

@+Maiky

Looks interesting, but the PDFs won't download from that site. If you have copies, could you link them to the forum?

Max

Tyimo · 22nd September 2005, 12:42 PM

Hi @+Maiky!

Very interesting site!

Basically I would like model and calculate some BLH-BR design, like the Isophon HornKehle or the Impulse H-6. This is why I am looking for a the modificated Helmholtz equation.

I am afraid, if this Haliaetus theory true, than the whole BLH "industry" are mistaken......

Greets:

Tyimo

maiky76 · 22nd September 2005, 02:35 PM

Hi!

Check the "Technology section". (You can play with the knob).
On the bottom left of the page you can donwload PDF of AES.
The pdf of the products themselves are not available.
BR
Mickael

Tyimo · 22nd September 2005, 04:00 PM

Hi Mickael!

Sorry, but the PDF of AES is not there. I get only the message:
"The requested URL was not found on this server"

Tyimo

21st September 2005, 06:24 AM	#1
Tyimo diyAudio Member Join Date: Nov 2002 Location: Hungary	Horn Shaped Duct Hi! Only one question: How could I calculate the Helmholtz Resonant Frequencies in a ported box, but with an exponential-horn-shaped duct??? I know only the original equation: fh = (c/2ð) x sqrt(S/VL) Tyimo

21st September 2005, 10:23 AM	#2
synergy diyAudio Member Join Date: Jan 2004 Location: here	use horn response and model yourself a rearloaded horn __________________ think outside the box

21st September 2005, 12:59 PM	#4
synergy diyAudio Member Join Date: Jan 2004 Location: here	the helmholtz resonator works on the priciple that the port contains a mass of air when coupled to a chamber it resonates at a particular frequency you could using WinISD or the like model your basic port dimensions then using the volume found work out an exponential port that contains the same volume of air however doing that you won't be able to model the gain that comes from the flare using MJK's sheets might actually be better cos hornresponse only calculates the response of the horn not the driver as well __________________ think outside the box

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21st September 2005, 12:45 PM	#3
Tyimo diyAudio Member Join Date: Nov 2002 Location: Hungary	Yes, and I could also use MJK's Mathcad program..... Is there any more simple way? Tyimo

21st September 2005, 04:01 PM	#5
Tyimo diyAudio Member Join Date: Nov 2002 Location: Hungary	Thanks! I think it is a good idea! Greets: Tyimo

21st September 2005, 04:34 PM	#6
maiky76 diyAudio Member Join Date: Dec 2004 Location: China, SZX	Hi! Ony for your eyes: http://www.haliaetus.com/va/haliaetus.html ther are some AES papers, very intesting at least... Once you read it maybe you'll change you're mind for something else than e(x) for your port. @+Maiky

22nd September 2005, 12:42 PM	#8
Tyimo diyAudio Member Join Date: Nov 2002 Location: Hungary	Hi @+Maiky! Very interesting site! Basically I would like model and calculate some BLH-BR design, like the Isophon HornKehle or the Impulse H-6. This is why I am looking for a the modificated Helmholtz equation. I am afraid, if this Haliaetus theory true, than the whole BLH "industry" are mistaken...... Greets: Tyimo

22nd September 2005, 02:35 PM	#9
maiky76 diyAudio Member Join Date: Dec 2004 Location: China, SZX	Hi! Check the "Technology section". (You can play with the knob). On the bottom left of the page you can donwload PDF of AES. The pdf of the products themselves are not available. BR Mickael

22nd September 2005, 04:00 PM	#10
Tyimo diyAudio Member Join Date: Nov 2002 Location: Hungary	Hi Mickael! Sorry, but the PDF of AES is not there. I get only the message: "The requested URL was not found on this server" Tyimo

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