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
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
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
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
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
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
maiky76 said:
Looks interesting, but the PDFs won't download from that site. If you have copies, could you link them to the forum?
Max
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
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
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
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
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
Sorry, but the PDF of AES is not there. I get only the message:
"The requested URL was not found on this server"
Tyimo
Re-Hi!
Too bad! The PDF are too big to be attached here.
Anyway, they do not claim anything against hornloaded subs.
An article from Nokia research ( from the famous Juha Backman I think) alredy show that in so called hornloaded subs the front horn if it is folded at least plays the role of a kind of BR load...
No, our guys deal with very low frequency, were no horn worth the test, and they make a dipole directivity pattern for their sub.
They smartly use the BR behaviour around the Fb to increase the low extension. The points of using a nozzle are
- to drastically reduce the air flow noise cause by port under high air speed conditions
- to convert the kinetic energy of the air flow into the potential energy of the pressure sound wave (the inverse of the high speed water cleaner Karcher) because pressure is what we hear….
In addition, the whole professionals, or so called, can all do the same mistake:
MTM for a center channel in Home-theatre is exactly the worst case for horizontal directivity!!!!
@+
Mickael
Too bad! The PDF are too big to be attached here.
Anyway, they do not claim anything against hornloaded subs.
An article from Nokia research ( from the famous Juha Backman I think) alredy show that in so called hornloaded subs the front horn if it is folded at least plays the role of a kind of BR load...
No, our guys deal with very low frequency, were no horn worth the test, and they make a dipole directivity pattern for their sub.
They smartly use the BR behaviour around the Fb to increase the low extension. The points of using a nozzle are
- to drastically reduce the air flow noise cause by port under high air speed conditions
- to convert the kinetic energy of the air flow into the potential energy of the pressure sound wave (the inverse of the high speed water cleaner Karcher) because pressure is what we hear….
In addition, the whole professionals, or so called, can all do the same mistake:
MTM for a center channel in Home-theatre is exactly the worst case for horizontal directivity!!!!
@+
Mickael
Hi maiky76,
Have heard these speakers? The best youve heard?
Also do they claim a better effeciency for the ports or just less port noise?
regards,
Coolin
Have heard these speakers? The best youve heard?
Also do they claim a better effeciency for the ports or just less port noise?
regards,
Coolin
Hi!
Yep, I heard them! Very impressive and actually no air flow noise at very high level and low extention. Impact, speed and effortless would be ihmo the good description.
They use widely known drivers from Scanspeak from the mid high but maybe in the best way I've head so far.
Anyway the best speaker for me is the Neo from Mosquito that I heard in Dynamicaudio 5555 in Tokyo (compared with Focal Grande Utopia Be, BW 800D, Sonus Faber Stradivari, Krell LAt...).
www.mosquito-groupe.com
You cannot miss them....
@+
Mickael
Yep, I heard them! Very impressive and actually no air flow noise at very high level and low extention. Impact, speed and effortless would be ihmo the good description.
They use widely known drivers from Scanspeak from the mid high but maybe in the best way I've head so far.
Anyway the best speaker for me is the Neo from Mosquito that I heard in Dynamicaudio 5555 in Tokyo (compared with Focal Grande Utopia Be, BW 800D, Sonus Faber Stradivari, Krell LAt...).
www.mosquito-groupe.com
You cannot miss them....
@+
Mickael
Very nice !
Too bad there not that sensitive ...
The internal acoustic shape looks promising though.
Have you worked on these ?
Is there any more info on the internals and more pictures?
R,
Coolin
Too bad there not that sensitive ...
The internal acoustic shape looks promising though.
Have you worked on these ?
Is there any more info on the internals and more pictures?
R,
Coolin
Hi!
Let's try this link, it where I listened to them in Toyo. The vendor just fell in love with the Neo and wrote a 41(!) pages report...
http://www.dynamicaudio.jp/file/050413/oto-no-osomichi_neo.pdf
page 5 inner details.
@+
Maiky
Let's try this link, it where I listened to them in Toyo. The vendor just fell in love with the Neo and wrote a 41(!) pages report...
http://www.dynamicaudio.jp/file/050413/oto-no-osomichi_neo.pdf
page 5 inner details.
@+
Maiky
Hi!
Try that:
dynamicaudio.jp/file/050413/oto-no-osomichi_neo.pdf
Put the address on your browser add WWW.
Anyway the Pdf is in Japanese but I am sure you read the pictures 🙂 Maybe you can try an automatic translater. This one is quite good.
http://www.infoseek.co.jp/Honyaku?pg=honyaku_top.html
Check the second bax on the right of the Union Jack fot web page translation.
@+
Maiky
Try that:
dynamicaudio.jp/file/050413/oto-no-osomichi_neo.pdf
Put the address on your browser add WWW.
Anyway the Pdf is in Japanese but I am sure you read the pictures 🙂 Maybe you can try an automatic translater. This one is quite good.
http://www.infoseek.co.jp/Honyaku?pg=honyaku_top.html
Check the second bax on the right of the Union Jack fot web page translation.
@+
Maiky
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