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kddp90 View Drop Down
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    Posted: 04 April 2021 at 2:26am
Hi everyone!!!

Can someone please explain me the mechanism behind this???

https://pasteboard.co/JVHiWJI.jpg


Edited by kddp90 - 04 April 2021 at 2:29am
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toastyghost View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote toastyghost Quote  Post ReplyReply Direct Link To This Post Posted: 08 April 2021 at 2:07am
It's a tapped horn, using two drivers each with their own loading. Likely inspired by the Danley Sound Labs TH-SPUD. Danley own the patent on tapped horns in commercial use, but there are tons of DIY designs out there (and some commercial ones that come very close to infringing...).

Here's an example DIY cabinet that's not too dissimilar:
http://wp.volvotreter.de/projects/th-2/the-tangband-cinema-sub-tapped-horn/

And another, based on the original TH-SPUD:
https://www.diyaudio.com/forums/subwoofers/172025-th-spud.html

diyaudio.com is a much better place to dig into this topic, on the whole.
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snowflake View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote snowflake Quote  Post ReplyReply Direct Link To This Post Posted: 08 April 2021 at 9:50pm
Originally posted by kddp90 kddp90 wrote:

Hi everyone!!!

Can someone please explain me the mechanism behind this???



one of the drivers isn't loaded into the horn throat so not the same as the TH spud. It's either very clever or totally idiotic.
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kddp90 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kddp90 Quote  Post ReplyReply Direct Link To This Post Posted: 09 April 2021 at 12:56am
Originally posted by toastyghost toastyghost wrote:

It's a tapped horn, using two drivers each with their own loading. Likely inspired by the Danley Sound Labs TH-SPUD. Danley own the patent on tapped horns in commercial use, but there are tons of DIY designs out there (and some commercial ones that come very close to infringing...).

Here's an example DIY cabinet that's not too dissimilar:
http://wp.volvotreter.de/projects/th-2/the-tangband-cinema-sub-tapped-horn/ - http://wp.volvotreter.de/projects/th-2/the-tangband-cinema-sub-tapped-horn/

And another, based on the original TH-SPUD:
https://www.diyaudio.com/forums/subwoofers/172025-th-spud. - https://www.diyaudio.com/forums/subwoofers/172025-th-spud.html

diyaudio.com is a much better place to dig into this topic, on the whole.

Originally posted by snowflake snowflake wrote:

Originally posted by kddp90 kddp90 wrote:

Hi everyone!!!

Can someone please explain me the mechanism behind this???

https://pasteboard.co/JVHiWJI.jpg - https://pasteboard.co/JVHiWJI.jpg
 

one of the drivers isn't loaded into the horn throat so not the same as the TH spud. It's either very clever or totally idiotic.

While thanking for links @toastyghost given, I'm with @snowflake, which is why I'm CONFUSED, found this online recently in a Google image search for "20hz subwoofers", but I don't remember the exact source now, just as @snowflake says however, I'm alright with the 1st driver at the throat, but where is the 2nd driver???, it's like nowhere, its rear loads out-of-phase with the 1st at the ending of the narrow path and front near the wide mouth, it's named "Paraflex" in the image, but as far as I know Paraflex is NOT made by any means as one driver throat-loading with another one mouth-loading... Wacko


Edited by kddp90 - 09 April 2021 at 1:00am
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Elliot Thompson View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Elliot Thompson Quote  Post ReplyReply Direct Link To This Post Posted: 09 April 2021 at 2:11am

The cabinet follows a Transmission in addition, to a Band-pass principal. So it could be looked upon as a Hybrid. The orientation of the drivers (causing a phase issue) can be solved by reversing the polarity on one of the loudspeakers. With no compression/expansion ratio, it offers no characteristics of a horn.

The design may be categorized as, one out of thousands of speaker plans available on the Internet, offering no clear cut answers on performance results. It really would not make sense for you to pursue a design in which, you have no idea what loudspeaker was involved to attain the claims the box can produce 20 Hertz.

It reminds me of a Youtube Channel that offers hundreds of speaker plans with no recommended loudspeaker for the design(s) in question. 


Best Regards,



Edited by Elliot Thompson - 09 April 2021 at 2:12am
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kddp90 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kddp90 Quote  Post ReplyReply Direct Link To This Post Posted: 11 April 2021 at 11:46pm
Originally posted by Elliot Thompson Elliot Thompson wrote:

The cabinet follows a Transmission in addition, to a Band-pass principal. So it could be looked upon as a Hybrid. The orientation of the drivers (causing a phase issue) can be solved by reversing the polarity on one of the loudspeakers. With no compression/expansion ratio, it offers no characteristics of a horn.

The design may be categorized as, one out of thousands of speaker plans available on the Internet, offering no clear cut answers on performance results. It really would not make sense for you to pursue a design in which, you have no idea what loudspeaker was involved to attain the claims the box can produce 20 Hertz.

It reminds me of a Youtube Channel that offers hundreds of speaker plans with no recommended loudspeaker for the design(s) in question. 


Best Regards,

That's exactly why I posted it here, it gives no information on how it achieves 20hz, so I thought if someone here might know something about it, but I'm trynna realize now it's kinda misleading, even the loading of the 2nd driver proves that I guess... Big smile
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