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Jo bg 
Young Croc 
Joined: 08 March 2017 Status: Offline Points: 548 |
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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: 1766 |
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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: 278 |
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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: 6049 |
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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: 6049 |
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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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