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smitske96
Young Croc Joined: 16 February 2016 Location: The Netherlands Status: Offline Points: 1092 |
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Posted: 22 October 2021 at 2:29pm |
Some time ago I was trying to find any info or papers about using boudaries to get extra gain from subwoofers. In this case I am not just talking about a wall or ceiling etc. But more like portable solutions, that are placed behind/besides the cabinets to profit from extra gain.
I can imagine some effects, but am more curious about some real data. I am sure there is lots of info to find about the topic, but I think the language boundary prevents me from searching with the correct words.
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VECTORDJ
Young Croc Joined: 11 June 2006 Location: United States Status: Offline Points: 515 |
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Older Altec designs used" Barn Doors" to increase low end output...In the "Klipsch Papers" Klipsch writes about a "False Corner"....
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Conanski
Old Croc Joined: 26 January 2006 Location: Ottawa, Canada Status: Offline Points: 2537 |
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A good link showing how boundaries affect loudspeaker response.. How Do Boundaries Affect Loudspeakers? (prosoundtraining.com)
The thing to remember is any structure that is large relative to the sound wavelengths in question becomes a boundary to those waves, so for example the speaker baffle itself is a boundary for high frequencies, and a big enough stack of subs will also act as a boundary to themselves starting at the highest frequencies of operation(shortest wavelengths) first and extending down as the stack grows in size. You may have seen the horn extensions used on some horn subs, there is a similar concept called barn doors that can be used with any style of speaker system that does somewhat act as a boundary, the extent to which it works very much depends on the size of that structure.
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smitske96
Young Croc Joined: 16 February 2016 Location: The Netherlands Status: Offline Points: 1092 |
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@Conanski
I am aware of those papers/writeups but am more targeting to the boundary effect a fixed concrete stage can have where the subs are placed in a special cavity. In a local club they have a special brick housing around some MTL2's and am curious of there are any measurements about similar situations. |
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toastyghost
The 10,000 Points Club Joined: 09 January 2007 Location: Manchester Status: Offline Points: 10919 |
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https://www.prosoundweb.com/counterintuitive-cardioid-subwoofers-can-be-a-bit-claustrophobic/ Reference papers linked at the end. https://www.aes.org/e-lib/browse.cfm?elib=20265 For horns, if you have access. The effect is on the radiation impedance. You'll need to solve some double or quadruple integrals to look into it analytically for a given situation. Start with the Rayleigh integral and some acoustics textbooks - I recommend the ones by Frank Fahy to start. Foundations of engineering acoustics https://g.co/kgs/ZtdwJi Fundamentals of Sound and Vibration https://g.co/kgs/GTW87w Edited by toastyghost - 22 October 2021 at 4:04pm |
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