A horn does not have to be the source of high frequency problems.
There are methods that can be used to make the horn work in higher frequencies. You simply have to divide the throat with a few vertical pieces that are spaced apart in the wavelength that you want the horn to work up to. As an example the wavelength of 10 kilohertz is approximately 25mm. SO any area that is wider will have the ability for the reproduced sound to bounce over this path and cause a partial loss in the output.
Sorry, should have been a link:
Problem with vertical bars to get several adjacent throats, is that it will be more mechanics that can vibrate when excited by low end of the spectra.
Couldn't there be some comb effects as well?
I've tried reticulated foam used for HVAC but with no effect.
(Båndsei, your turn to get some popcorn)
Problem with vertical bars to get several adjacent throats, is that it will be more mechanics that can vibrate when excited by low end of the spectra.
Couldn't there be some comb effects as well?
I've tried reticulated foam used for HVAC but with no effect.
(Båndsei, your turn to get some popcorn)
Trouble with shallow horn flare is that not much will happen for all the work of making a horn.
With balance in the design and making of the horn there are enough benefits to make it worth while.
But it is not a simple thing to do to the best possible effect.
Reticulated foam is only useful under limited circumstances. I know that it was used by Earl Geddes as a bandaid for some of his troubles with horn design.
But it was an intelligent application of a product in the right place. It is not something that works in many other situations.
With balance in the design and making of the horn there are enough benefits to make it worth while.
But it is not a simple thing to do to the best possible effect.
Reticulated foam is only useful under limited circumstances. I know that it was used by Earl Geddes as a bandaid for some of his troubles with horn design.
But it was an intelligent application of a product in the right place. It is not something that works in many other situations.
Drinking bear and building carporthttps://s-media-cache-ak0.pinimg.com/originals/4c/f3/81/4cf381dac1b8230999fa4f0a80445c8c.gif
how much helps a baffel at 500 Hz.https://s-media-cache-ak0.pinimg.com/originals/4c/f3/81/4cf381dac1b8230999fa4f0a80445c8c.gif
Bernt
how much helps a baffel at 500 Hz.https://s-media-cache-ak0.pinimg.com/originals/4c/f3/81/4cf381dac1b8230999fa4f0a80445c8c.gif
Bernt
well i have a tiny one now that plays from 600 and a baffle does nothing in my measurement. thats weird, will try to measure again a bit further away. i think i screwed it up by measuring at 40 cm
. gone get me some beers to
Thanks for the clarification. It concurs with my view of wave-guides.
In fact, perhaps just a simple baffle as båndsei suggest is enough to gain a couple of dB in the low end.
I have't found any impact from the use of the reticulated foam, yet.
It is essential to consider the edge effects of the baffel as well.ooh well re measured, it does mater only 2 -3 db from 500-1000 or so. but it also introduces crap higher up in the region. in the means of distortion or baffle diffraction
Also that there aren't any parallel walls anywhere but especially in the "throat".
thats the million dollar question to be honest. i searched countless hours. i could not find anything larger then a small sheet for ribbon mic's
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Have you guys considered robbing the foil out of capacitors?
Has worked in the past.
Foils List
4u micrometer (micron) Aluminum Foil Ribbon Microphone Replacement Upgrade Mod
Capacitor Materials, Specializing in Metallized Films, Aluminum Foil and Tin Foil
There are more.
Ebay may be the most simple method of purchasing the foil.
Has worked in the past.
Foils List
4u micrometer (micron) Aluminum Foil Ribbon Microphone Replacement Upgrade Mod
Capacitor Materials, Specializing in Metallized Films, Aluminum Foil and Tin Foil
There are more.
Ebay may be the most simple method of purchasing the foil.
Just ask. It is amazing what happens when we ask the right questions to the right people.
Even the source for the metalized film for capacitors.
If a contact can be made there you can get further down the supply chain and find someone that is willing to sell smaller amounts.
in 1996 I was asked by one client to develop copper foil inductors. I was able to get a contact with the mill that made the copper foil. And all that came at a price that no one would sell the product to me for until I had the right contact.
Don't ask.
Don't get.
Even the source for the metalized film for capacitors.
If a contact can be made there you can get further down the supply chain and find someone that is willing to sell smaller amounts.
in 1996 I was asked by one client to develop copper foil inductors. I was able to get a contact with the mill that made the copper foil. And all that came at a price that no one would sell the product to me for until I had the right contact.
Don't ask.
Don't get.
BREAKING NEWS !!!!
Soft AMT
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Diaphragm 32x80x10mm.
Made from PVDC film and alu with paper, and spray glue
Have not measured freq responce yet.
Beat this :Res freq. 130 Hz.
Bernt
oh wow... no i am insanly curious to the feq response!!!!
!!!! i can imagine it is pretty heavay spray glue with PVDC so im very very curious about the high end of the thing very small panel for such low res
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