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21 inch long throw horn |
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bass*en*mass 
Old Croc 
Joined: 03 September 2009 Location: "unknown" Status: Offline Points: 4009 |
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 Posted: 28 October 2015 at 8:29pm |
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mykeys take on it should be the c4s, goes lower if i remember correctly in blocks of 4
pfly, any HR plots for the 21"s? corell, some more details on your design would be great.. |
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tv00
Old Croc
Joined: 10 August 2009 Location: Denmark Status: Offline Points: 1886 |
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Posted: 28 October 2015 at 8:37pm |
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My guess is that his sims are more optimistic, he says he takes ghost / phanthom horn into account, this is also probably the best way to do it, if you imagine a long row of subs. I guess side by side horizontal should load in a way equal to ground? (according to 1pi being like 2 speakers in 2 pi)
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bass*en*mass
Old Croc
Joined: 03 September 2009 Location: "unknown" Status: Offline Points: 4009 |
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Posted: 28 October 2015 at 8:58pm |
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excuse me tv00, who accounts for "ghost part" and who doesnt?
imo, acoustic horn expansion has not much to do with "Pi". 2pi is halfspace with no boundaries within wavelength right? 1pi is quarterspace/halfspace with solid back/wall larger than wavelength or physical stack size larger than lowest wavelength? side by side/horizontal row shows issues if the array length exceeds the wavelengths, beaming occurs.. unless you curve the lot and stack higher or deeper for more spl |
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tv00
Old Croc
Joined: 10 August 2009 Location: Denmark Status: Offline Points: 1886 |
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Posted: 28 October 2015 at 9:03pm |
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Many accounts for ghost horn, look at invader thread, so does mykey according to himself. check
one box 1 pi is equal to two boxes 2 pi. check My question is if the ghost horn is fully used when stacked mirror horizontal or only in a long line, see? |
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bass*en*mass
Old Croc
Joined: 03 September 2009 Location: "unknown" Status: Offline Points: 4009 |
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Posted: 28 October 2015 at 9:53pm |
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mirror stacks do have limits as do horizontal lines..
a mirror stack of say 4x4 cabs could lead to full 1pi support up to Fs depending on size a horizontal stack of 16 cabs will cause beaming at shorter bass freq. due to array length exceeding the wavelengths within passband quite easy to simulate nowadays.. |
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corell
Young Croc 
Joined: 19 August 2013 Location: Berlin Status: Offline Points: 1161 |
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Posted: 29 October 2015 at 1:33am |
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Hi, i will send you the .skp of my 21" via PN.
Its a mod of the Big Bertha Sub with the magnet sitting in the frontchamber for improved cooling. Its designed around the 21lw1400 and hits 35 hz in singles at 103db. |
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pfly
Old Croc
Joined: 25 October 2007 Location: Helsinki, Fin Status: Offline Points: 2828 |
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Posted: 02 September 2016 at 9:46am |
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Bump!
Has this lead anywhere yet? |
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suiluj
Registered User 
Joined: 28 November 2007 Location: Phil/Singapore Status: Offline Points: 202 |
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Posted: 03 September 2016 at 3:36pm |
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Massive Horn 21 from HSD 
Edited by suiluj - 03 September 2016 at 3:39pm |
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BooM BASSTIK EleCtronics and Communications Engineer
Live in harmony with one another. Do not be proud, but be willing to associate with people of low position. Do not be conceited. |
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Dub Specialist Sound
Old Croc
Joined: 15 November 2013 Location: Smethwick Status: Offline Points: 4873 |
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Posted: 03 September 2016 at 4:59pm |
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very pretty bracing man
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Musical Roots Reggae Vibration is Life! for music is sound...sound is vibration...vibration is energy... and energy begets life. Therein lies my passion!...MUSIC IS LIFE...
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djeddie
Old Croc
Joined: 26 April 2004 Location: Bristol Status: Offline Points: 4125 |
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Posted: 03 September 2016 at 6:24pm |
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And if that cut-out is for a 21" driver... my back hurts just looking at it!
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Chas n Dave : it's like Drum and Bass but with beards. E=mc² ±3dB
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DMorison
Old Croc
Joined: 14 March 2007 Location: Aberdeen Status: Offline Points: 1649 |
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Posted: 03 September 2016 at 7:35pm |
Yeah, I did a very rough attempt at scaling (obviously the perspective of the pic makes it rough at best) and I came up with it being about 1.4m per side.... seriously big!
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MarjanM
Old Croc
Joined: 10 February 2005 Location: Macedonia Status: Offline Points: 7816 |
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Posted: 03 September 2016 at 8:37pm |
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Its probably full 5x5 sheet for one side. BIIIG!!
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Marjan Milosevic
MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
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djeddie wrote: