12" Tapped horn |
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tomschute
Old Croc Joined: 15 May 2006 Location: Mid Wales Status: Offline Points: 1817 |
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Just re reading this post and noticed something.
Have I missed something or are the horn lengths for S2 to S3 100cm too much... I make it 140 not 240. please tell me i'm wrong and all these HR and Akabak sims are correct....... Edited by tomschute - 11 August 2010 at 11:31pm |
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Out to lunch... stableaudio@hotmail.co.uk
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IanD
Registered User Joined: 17 January 2009 Location: London Status: Offline Points: 400 |
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If the Fletcher patent was cited by the examiner as prior art, this is why the Danley tapped horn patent application would have been rejected even though the Fletcher patent has expired -- I had a patent application rejected some time ago due to a patent dating from 1943 :-( Assuming the application has been rejected, this means that there's now no legal reason preventing anyone making and selling tapped horns -- which is a bit of a shame for Tom since he's done so much to make people aware of them, but that's the way the cookie crumbles with patents. Ian Edited by IanD - 11 August 2010 at 11:29pm |
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_djk_
Old Croc Joined: 23 November 2004 Location: United States Status: Offline Points: 6002 |
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"please tell me i'm wrong and all these HR and Akabak sims are correct......."
Yes, you're wrong and the sims are correct.
The 1/4W of 140cm is 62hz, how could it possibly hit 38hz if it was that short?
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djk
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tomschute
Old Croc Joined: 15 May 2006 Location: Mid Wales Status: Offline Points: 1817 |
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a late night crude sketch...
.. am I just over tired or what? I make it more like 163cm for s2 to s3... |
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Out to lunch... stableaudio@hotmail.co.uk
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Centauri
Old Croc Joined: 29 November 2004 Location: Newcastle Aus Status: Offline Points: 1792 |
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From what I can see, that sim is just a design that djk threw up last December, and is not a sim of the actual MTH-30. If you look at the FSP discussion page on the MTH-30, it specifies -3dB at 52Hz.....
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tomschute
Old Croc Joined: 15 May 2006 Location: Mid Wales Status: Offline Points: 1817 |
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how confusing! so what is the plan for the above HR data?
sorry if i'm confusing the thread just all seems a little disjointed. |
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Out to lunch... stableaudio@hotmail.co.uk
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Centauri
Old Croc Joined: 29 November 2004 Location: Newcastle Aus Status: Offline Points: 1792 |
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djk seems to like throwing the odd arbitrary TH sim of a mentioned driver into the mix, even if it does not represent the box being discussed........
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_djk_
Old Croc Joined: 23 November 2004 Location: United States Status: Offline Points: 6002 |
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My sims are of designs that looks good, similar to what is being discussed.
It is easy to see the length and mouth areas from the data field on the sims.
They are meant to be a suggested design, and it is up to the user to decide what he wants to build.
Hornresp liter volumes may be used to estimate overall bulk by dividing by .8, ie: 200L net will probably end up around 250L gross. Edited by _djk_ - 12 August 2010 at 2:48am |
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djk
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Centauri
Old Croc Joined: 29 November 2004 Location: Newcastle Aus Status: Offline Points: 1792 |
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Yes, I can see that, but some others have assumed that particular sim was for the box in question, which it clearly isn't.
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Centauri
Old Croc Joined: 29 November 2004 Location: Newcastle Aus Status: Offline Points: 1792 |
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tomschute
Old Croc Joined: 15 May 2006 Location: Mid Wales Status: Offline Points: 1817 |
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many thanks Centuri. It does get confusing when threads meander! |
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Out to lunch... stableaudio@hotmail.co.uk
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JDCutta
Registered User Joined: 24 June 2010 Location: North Lincs Status: Offline Points: 555 |
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DJK do you have the plan for the above?
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