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Bertha BH-882 Build |
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Young Croc 
Joined: 08 March 2017 Status: Offline Points: 558 |
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 Posted: 08 January 2023 at 9:52am |
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Scaling everything will make a dfferent horn and lower the tuning. If you want to keep same tuning you have to keep same horn length and just find a way tofit bigger driver - check rear chamber too.
27 is already a low tuning, lowering it will probably lower efficency in exchange for not so useful 23hz output - unless you are going for cinema fx
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bob4
Old Croc 
Joined: 29 February 2004 Location: Finland/Germany Status: Offline Points: 1924 |
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Posted: 08 January 2023 at 10:39am |
Very bad idea.
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BigSoundNorthWest
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Joined: 29 November 2014 Location: Manchester Status: Offline Points: 335 |
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Posted: 08 January 2023 at 11:27am |
Nope.
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csg
Old Croc
Joined: 17 September 2007 Location: bedford Status: Offline Points: 6085 |
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Posted: 08 January 2023 at 11:46am |
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Regardless of the change of scale, what exactly are you trying to achieve using 21” drivers in a box of this style?
The function of a horn is to provide a better match between the driver and the air it is trying to move. In essence a horn increases the effective size of the drivers you are using. This makes the coupling between the box and the outside world more efficient. Bigger drivers in a horn does not automatically mean lower frequency response or more output, although this may be possible with good design. But merely scaling up or down an existing design to suit your purposes does not automatically work, there are far too many variables for that.
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“The fact is this is about identifying what we do best and finding more ways of doing less of it better”
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Zitikaz
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Joined: 28 December 2022 Location: Estland Status: Offline Points: 4 |
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Posted: 08 January 2023 at 5:50pm |
HI I would like to reach 25hz with good response natural bass, 21lw1400 seems suitable driver. Plan is to use Levan ext aswell Maximum spl isnt primary goal, trying to get 25-60hz flat response. or better look Rcf 18x401 and forget upscaling to 21"? |
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csg
Old Croc
Joined: 17 September 2007 Location: bedford Status: Offline Points: 6085 |
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Posted: 08 January 2023 at 7:39pm |
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If huge SPL is not your main aim low tuned reflex would be my first choice. BMS18N862 is one option with its huge x-max.
Flat 25Hz Front loaded horns are going to be huge
Edited by csg - 08 January 2023 at 8:10pm |
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“The fact is this is about identifying what we do best and finding more ways of doing less of it better”
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Ricky2023
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Joined: 01 December 2023 Location: Australia Status: Offline Points: 2 |
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Posted: 01 December 2023 at 3:41pm |
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Hey does anyone have plans for mini Bertha looking to use a 12” subwoofer using it for outside movie nights and maybe some party’s probably going to use a sundown audio EV4-12 or a SA 12” or does anyone have a better solution for a portable subwoofer enclosure preferably a mini w bin or mini folded horn that is portable cheers Ricky
currently using a sundown audio EV3-12 in a 6th order parallel band pass for inside the house it does really well for movies and music it’s on roughly 750w
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JACKCO520
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Joined: 28 August 2007 Location: Belgium Status: Offline Points: 75 |
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Posted: 05 December 2024 at 1:28pm |
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hi
can someone tell my if the jbl 2269h wold work in state of the jbl 2242 thx |
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JACKCO520
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Joined: 28 August 2007 Location: Belgium Status: Offline Points: 75 |
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Posted: 05 December 2024 at 2:59pm |
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btw go see to realhorns de you gonne see a horn for 2x15 " jbl think 2265 or 2267 only on facebook thx
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Bams
Young Croc
Joined: 08 April 2009 Status: Offline Points: 679 |
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Posted: 09 December 2024 at 2:23pm |
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sorry to hijack this thread.. but JACKCO520 did you ever got around refurbing the abba rig?
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JACKCO520
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Joined: 28 August 2007 Location: Belgium Status: Offline Points: 75 |
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Posted: 09 December 2024 at 2:42pm |
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hi
am still working on y will tray to send a foto in the summer of 2025 y have all ready 5 bass and 4 tops done whit new paint and handles paint is tuff cab turbo blue handles penn elcom regards jaak
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JACKCO520
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Joined: 28 August 2007 Location: Belgium Status: Offline Points: 75 |
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Posted: 10 December 2024 at 12:30pm |
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can someone tell my how to post a picture y don't now that
thx |
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Twintub wrote: