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Old 2nd August 2016, 09:17 AM   #1
Augusts is offline Augusts  Latvia
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Default BMS 12S330 for a folded horn?

Hello,
I recently bought two BMS 12S330 subwoofers. What do you think about putting them in a folded horn enclosure? They can be used from 25-300 hz but I dont know all the cans and cannots for folded horns. I have tried using the Horn resp but I have never understood how can you get a reasonably sized box and a nice frequency response. I am lost here, my thinking does not work in this sector..

A
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Old 3rd August 2016, 05:43 PM   #2
JLH is offline JLH  United States
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You can't get a reasonable sized enclosure using a horn. The lower the frequency, the larger the horn. Placing a horn in a corner will help reduce the required mouth size by providing boundary reinforcement. However, it will still be very large. A 25Hz wavelength is approximately 45 feet long. The minimum length for a 25Hz would be about 11.25 feet long and require a mouth size of around 20 sq. ft. when placed in a corner.

John Inlow has built some bass horns that make several intelligent compromises. See his web page at this link: Spiral Bass Horn - The Paper Horn by Inlow Sound

He makes it work by trading some extra excursion for low end bandwidth by boosting with DSP. Its still a huge horn, but more reasonable in size than some other solutions I've seen.

If you are open to using a Tapped Horn instead of a front loaded horn, things can be made smaller. However, it will require more power because it won't be as efficient or have well behaved impedance curve as a front loaded horn.
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Old 5th August 2016, 06:55 AM   #3
epa is offline epa  Netherlands
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be more specific
what purpoce, home theatre, music,pa?
freg range ,size limmits.seperate amp, dsp
its a nice driver to do something with.
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Last edited by epa; 5th August 2016 at 06:58 AM.
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Old 6th August 2016, 09:03 AM   #4
Augusts is offline Augusts  Latvia
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Hey, thanks for the answers, very inspiring and informative
Ill be using it for PA, it would have a proper seperate amp and a DSP on the system. The range would be nice to go as low as possible, judging form the previous post 30-35 hz would be a box that I could move. 30-60 hz .... 35- 70hz something like that
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Old 6th August 2016, 05:26 PM   #5
epa is offline epa  Netherlands
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a th comes to mind.
400 ltrs you can move it with 2 persones,or 1 when you put casters on?
you can get 121db(mathematical x-max) from 32>80hz +1 -3db @41volt.
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Old 6th October 2016, 01:22 PM   #6
Augusts is offline Augusts  Latvia
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Sorry for disappearing, I was very frustrated and tired.

I decided to use the speaker more like a midbass, built a small box and crossed it at 45 hz. Now I can throw full power at it. Also I am going to write music that moves from 45 hz and on. No more big boxes and crazy adventures

Thanks
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Old 6th October 2016, 01:28 PM   #7
Augusts is offline Augusts  Latvia
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These are the speakers, they have a 12 sub and a 12 coax speakers in them

They come with a small powerhouse
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