Punisher Extension Development Thread |
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citizensc
Young Croc Joined: 16 October 2015 Location: Perth,Australia Status: Offline Points: 532 |
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Thanks for the idea, unfortunatly it doesnt appear to be much use in the bass frequencies, it also wont work for coupled speakers, I can only do it for a single punisher with a half sized horn extension. Here are the results: Without horn extension With horn extension Even at 90 degrees it doesnt show much, -0.1dB with out the extension, -0.3dB with the extension. I Guess it shows that the extension is doing something but how much is unclear. |
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toastyghost
The 10,000 Points Club Joined: 09 January 2007 Location: Manchester Status: Offline Points: 10919 |
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Because time is money. The guys in Ireland made one out of steel plates tensioned with steel bar and stretchers, and it worked very well and of course took up a lot less space in transit, but it was only feasible to build for a multi day festival event, again delivered by truck due to the extra weight. |
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Jo bg
Young Croc Joined: 08 March 2017 Status: Offline Points: 552 |
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Try to model a single horn the size of the whole stack plus extender, with horn mouth as large as the three stacked extensions.
If you look at Art Welter empirical findings on "barn doors" in diyaudio forums, extending the frontal area and disregarding horn path, you see a rise in dBs but not as much low corner shift as in your Sims, so I believe you are only visualizing one side of the effect. If I remember correctly he talks about something like a 3 dB gain from doubling of frontal area, more gets impractical. I agree that without making this foldable or at least nestable , it will be a pain to move. (Even 15 mins one way, 30 mins roundtrip means one more hour of travel, not accounting loading and unloading)
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Elliot Thompson
Old Croc Joined: 02 April 2004 Location: United States Status: Offline Points: 5175 |
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The expansion rate to the mouth plays a factor. If the box is already expanded to a particular frequency at the mouth, adding on an extension to the mouth can just make the box louder without any means of low frequency extension. You need to have pressure buildup in order to achieve lower frequencies at a greater intensity. So what happens when there is no pressure buildup below the Punisher's horn cutoff point and, you add a large exponential horn extension in front of the Punisher's horn mouth to extend the low frequency response? Nothing. This is due to no low frequency pressure buildup at the extended frequencies you are trying to achieve. There are principals of a horn you need to follow and, you are just looking at one part of the equation.
You should not put all your trust in simulations. It only tells half the story especially when it comes to output. There are too many variables that come into play which, can only be answered by literally measuring the box in the real world. Using a simulator under 1-watt/2.83 volt is fine. However, once you start focusing on high sound pressure levels, you need to put down the simulator software and start using a measuring software. Best Regards, Edited by Elliot Thompson - 27 November 2019 at 2:14pm |
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Elliot Thompson
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mobiele eenheid
Old Croc Joined: 15 August 2004 Location: Netherlands Status: Offline Points: 1568 |
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This is the on axis directivity of the stack of 6 Punisher plus extension versus the power response/ standard simulated response. And this is the on axis directivity of 6 Punishers versus the on axis directivity of 6 Punishers with the extension. |
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citizensc
Young Croc Joined: 16 October 2015 Location: Perth,Australia Status: Offline Points: 532 |
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How did you do these sims? I am not able to replicate them. Thanks in advance
Edited by citizensc - 28 November 2019 at 10:00am |
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mobiele eenheid
Old Croc Joined: 15 August 2004 Location: Netherlands Status: Offline Points: 1568 |
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Dutchman
Registered User Joined: 23 March 2013 Location: GENT Status: Offline Points: 365 |
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Like the idea! Do you already have a cut sheet?
Maybe we can build and test it in Belgium , friend of mine has 12 punishers :)
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We need more SPL!
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citizensc
Young Croc Joined: 16 October 2015 Location: Perth,Australia Status: Offline Points: 532 |
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But what were your inputs!? I cant seem to make a single horn sim similarly to 6 coupled punishers |
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citizensc
Young Croc Joined: 16 October 2015 Location: Perth,Australia Status: Offline Points: 532 |
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I don't yet, What software would you like the cut sheet made up in? |
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Dutchman
Registered User Joined: 23 March 2013 Location: GENT Status: Offline Points: 365 |
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Maxcut, dxf or just simple pdf :D.
I can buy quality birch sheets for 39 pounds so it can’t go wrong! It must go lower, i’ll try and measure :)
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We need more SPL!
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citizensc
Young Croc Joined: 16 October 2015 Location: Perth,Australia Status: Offline Points: 532 |
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No problem, will get it done next week, good a large booking (for us) this weekend.
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