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21" Folded Horns for 40hz in pairs
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Keen View Drop Down
Young Croc
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Joined: 30 May 2011
Location: Brisbane, Aus
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Points: 1271 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Keen Quote  Post ReplyReply Direct Link To This Post Posted: 16 February 2022 at 12:24am
Lev, you've been on this search for over 10 years! Wink
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levyte357- View Drop Down
Old Croc
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Joined: 27 July 2012
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Points: 8517 		Post Options Post Options   Thanks (0) Thanks(0)   Quote levyte357- Quote  Post ReplyReply Direct Link To This Post Posted: 16 February 2022 at 8:45am
Originally posted by Keen Keen wrote:

Lev, you've been on this search for over 10 years! Wink


Yeah, but now have 8x of my own design Scoops, for certain purposes, so can now try out Folded Horns for the right gigs.LOL

TBH, think I will just try out some WSX with various modern drivers.

Not all 21" Folded Horns, deliver the goods, as you would expect.
Global Depopulation - Alive and Killing.
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snowflake View Drop Down
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Points: 3443 		Post Options Post Options   Thanks (0) Thanks(0)   Quote snowflake Quote  Post ReplyReply Direct Link To This Post Posted: 16 February 2022 at 1:58pm
not even sure a 21" driver is useful to achieve this. large diameter voicecoil on multiple 12"/15" drivers is more useful with the required mouth, length and flare rate.
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toastyghost View Drop Down
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Joined: 09 January 2007
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Points: 10932 		Post Options Post Options   Thanks (0) Thanks(0)   Quote toastyghost Quote  Post ReplyReply Direct Link To This Post Posted: 16 February 2022 at 5:57pm
Originally posted by snowflake snowflake wrote:

not even sure a 21" driver is useful to achieve this. large diameter voicecoil on multiple 12"/15" drivers is more useful with the required mouth, length and flare rate.


Shh, less of the sensible scientific approach around here
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Ricci View Drop Down
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Joined: 13 March 2017
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Points: 74 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ricci Quote  Post ReplyReply Direct Link To This Post Posted: 16 February 2022 at 7:34pm
Originally posted by bob4 bob4 wrote:

https://data-bass.ipbhost.com/topic/613-riccis-skhorn-subwoofer-files/page/1

Not a horn, and a double driver cab, but goes plenty loud according to reports, dropping to 30 Hz and below....
In a scoopish kind of form factor.


Link to some of the measurements of that sub. 

Plenty of ways to crush 40Hz and much lower. Vented, TH, ported horn, FLH...
Try not to confuse flat voltage response to 40Hz with ability to produce powerful output at those freq's. They are not the same. EQ helps when required. 

This is a moderate sized FLH with a single 18" driver. Strong output to about 35Hz. 
Link to the test data.
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