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A 32Hz tuned TH for a dub soundsystem
A 32Hz tuned TH for a dub soundsystem
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Old 23rd August 2019, 01:10 PM   #1
waxx is offline waxx  Belgium
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Default A 32Hz tuned TH for a dub soundsystem

I don't know if you know that music scene, but in dub and rootsdub parties are organised with big stacks of boxes tuned very low (32Hz is the goal) and bassheavy. They use 4 scoop horns (backloaded horns) with 18" drivers for the sub in a 3 till 5 way config and almost everything is custom handbuild, often by the dj crew themselves (see picture for the stack of Dub Stuy (NYC) for an example). A single stack is mostly 12-16kW and medium throw, wich is perfect for parties from 100 to 5000ppl (if you put a few stacks in the space). But for a small bar or party space (50-100ppl) this is way to powerfull, big and annoying for the neighbours because ofthe medium throw of the subs.

I know a lot of people in that scene here in Belgium and with some of them we discussed to make a smaller stack for bar gigs. I think a tapped horn would be best for this, but i can't find a fit design for this (also because my hornresp skill are very minimal, i'm a winisd guy for designing). The size may not be too big (the size of a standard scoop would be perfect) so an otthorn is out of the question. And other designs that are smaller that i see are tuned to high (35 till 40Hz). Is this possible to make a TH of arround 100dB on 1w/1m tuned to 32Hz or lower, about 800-1500w of power and of the size of a standard scoop (65cm wide, 120cm high and 80cm deep). Are there existing designs that are free to use (or cheap) and fit this conditions? And this preferable with a driver (or drivers) of less than 500 for each box.

I could easely make a vented box (with more power to get the same spl), but i would prefer a TH for this (and many dubheads with me) because of the low frequency respone and efficiency.
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Old 23rd August 2019, 01:55 PM   #2
Brian Steele is offline Brian Steele  Grenada
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My POC4 ("B1") design got pretty close to a 32 Hz Fb within the dimensions that you specified (its external dimensions were 32" x 22.5" x 40"), so it should be possible to come very close to, if not meet, your specifications. The B1 never made it into live use (the owner moved on to other projects) and it's in need of updating. However, if you're interested in what the layout looked like, see link below.

The Subwoofer DIY Page v1.1 - Projects : "Proof of Concept #4"
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Old 23rd August 2019, 02:10 PM   #3
Dave R is offline Dave R  United States
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The Anarchy Tapped horns go down to 25 or 27 Hz.
The Anarchy woofer is 7".
TH is 8.38" W x 20.25" D x 30" H. (size is relatively compact) Terminus is 7.38"W x 5.38"H.
Don't know what their efficiency is @ 1W/1m.
And there's lots of noise above the usable bandwidth.
Nowhere near your 800-1500W wishlist either.
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Old 23rd August 2019, 02:20 PM   #4
kipman725 is offline kipman725  United Kingdom
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There is no 'throw' for subs apart from a few exceptions they are omi directional. Loudspeakers are described as long, short medium throw based on their directivity. The only solution to your small space sound leakage problems is to turn it down unfortunately.

Saying that people often listen with their eyes so if you turn up with a physically smaller system even with the same dancefloor SPL you may have an easier time
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Old 23rd August 2019, 06:50 PM   #5
waxx is offline waxx  Belgium
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Sorry, but that is ********. The horn of a scoop or a folded horn does push the sub to further in the field than a tapped horn (depending on the hornmouth), and certainly than a ported or sealed woofer. It's not that you don't hear it off axis like a line array, but there is certainly a throw that makes the subbass go further than a sub with no hornloading even if subbas is omnidirectional. I know that from 25 years in the field as soundengineer, dj and promotor. That horn also works as waveguide wich concentrate the subbass in a cardiod throw.

And we already did the test with a scoop with a Fane Colossus 18XB driver, and the same driver in a ported cabinet in a small bar measuring the noise at the neighbours house. The neighbour (who lives in the line of fire of the scoop) had about 6dB more noise with the scoop than with the ported cabinet on the same level in the bar. That bar changed their 2 scoops they had as sub for ported cabinets with the same fane driver (but 2 drivers and double the amp power to make up for the loss of efficiency) and had much less noise complaints after that while keeping the same spl level inside.
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Old 25th August 2019, 12:53 PM   #6
tonskulus is offline tonskulus  Finland
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Hog scoop, it has depth of 95cm.. too deep?
It does 30Hz (especially if two or more stacked). It's tuned lower than traditional scoop.

Bass horns has better directivity (or "throw") because of larger radiating area etc.. Room acoustics might be more problematic for horns tho..
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Old 25th August 2019, 07:13 PM   #7
GM is offline GM  United States
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Quote:
Originally Posted by waxx View Post
Is this possible to make a TH of arround 100dB on 1w/1m tuned to 32Hz or lower, about 800-1500w of power and of the size of a standard scoop (65cm wide, 120cm high and 80cm deep). Are there existing designs that are free to use (or cheap) and fit this conditions? And this preferable with a driver (or drivers) of less than 500 for each box.
No clue ATM; what XO point/slope desired?

GM
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Old 25th August 2019, 08:46 PM   #8
waxx is offline waxx  Belgium
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Originally Posted by GM View Post
No clue ATM; what XO point/slope desired?

GM
Traditionally around 85hz and 4th order L/W where the kickbins take over...
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Old 25th August 2019, 10:03 PM   #9
wg_ski is offline wg_ski  United States
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Horns (tapped, rear loaded, or front loaded) use Hoffman’s iron law in reverse. The reason they are more SPL per watt than a vented box with a given tuning is because they are larger. Make it smaller and you drop efficiency/sensitivity. If you have a specific box size in mind, the only way to get the SPL and directivity back is to use a larger array of them. Othorns are tuned low, but larger than your target and not quite 100dB/W either. If you continue to make horns smaller and smaller (while maintaining the same tuning frequency) you eventually get to a point where there is no output advantage over a regular vented box.
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Old 25th August 2019, 10:32 PM   #10
Brian Steele is offline Brian Steele  Grenada
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32 Hz 100+dB TH using the B&C 18TBX100 (published specs). Box size is the "standard" scoop horn as previously mentioned. I doubled up on the thickness of the top and bottom panels and the driver baffle. Required bracing is not displayed in the image.

So yes, it's possible.
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