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dB Technologies SUB 15H Semi Horn Loaded  ?
dB Technologies SUB 15H Semi Horn Loaded  ?
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Old 25th January 2019, 02:34 PM   #1
Mordor is offline Mordor  Italy
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Question dB Technologies SUB 15H Semi Horn Loaded ?

Im curious about this speaker:
dB Technologies SUB 15H Semi Horn Loaded.

From db web site:
"This hybrid horn-loaded subwoofer ensures exceptional efficiency, even at closer listening distances, making it ideal for a wide range of venue sizes"

Im very interested about this kind of load and i have some RCF 15" driver.
Some ideas about to how to make a kind of clone and interior design?
Should i try or prefer a simple reflex in order to make a sub for small pubs and stages ?
Thank
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Old 25th January 2019, 06:20 PM   #2
chris661 is offline chris661  United Kingdom
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From the photos I've seen online, it's basically a bass reflex design.
The so-called "horn loading" is a baffle that's been angled by about 10 degrees. It might provide a couple of dB of boost at 500Hz, but nothing useful in the <100Hz region.

It's best to design for a particular driver, rather than hoping it will work in a particular design.

Chris
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Old 25th January 2019, 06:28 PM   #3
GM is offline GM  United States
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It appears to be crude 6th order band-pass [BP] alignment, i.e. a BR with the vent coming forward to a flared terminus [mouth] that somewhat loads the driver or I guess could be described as a truncated/mini TH.

Over a narrow range it should outperform a BR for a given bulk [specs implies ~1.5 octaves, so if you need more, then either go TH for 2+ octaves or [multiple] BRs.

GM
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Old 25th January 2019, 07:08 PM   #4
Smitske96 is offline Smitske96
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I have some 18" cabs that have a similar layout. It gains some 80 Hz and up. Beneath that it works like a BR. Still pretty loud down to 40 Hz because of the 18S430V2.

I'm going to do some measurements next month, and I'll share the info.
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Old 25th January 2019, 08:01 PM   #5
Rademakers is offline Rademakers  Netherlands
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I would call it a (tapped horn/ bass reflex) hybrid. The small horn flare at the end typically has it's effect around the crossover frequency region (80 Hz and up). The tapped part has it's effect in the middle of the frequency response, typically between 50 - 75 Hz. Because of the angle of the baffle in this particular case, I don't expect a whole lot of effect from the tapped part.

Still, it usually performs very similar to a 6th order band pass, including dips outside it's operating band width.

Johan
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Old 25th January 2019, 08:19 PM   #6
NEO Dan is offline NEO Dan  United States
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It looks like a good way to alleviate the effects of having the port opening up right against the grille.
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Old 11th February 2019, 11:16 AM   #7
Mordor is offline Mordor  Italy
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Any ideas about how to calculate or build something similar?
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Old 11th February 2019, 03:40 PM   #8
chris661 is offline chris661  United Kingdom
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Hornresp would do it. Simulate as a tapped horn.

Chris
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Old 11th February 2019, 06:23 PM   #9
Djim is offline Djim  Netherlands
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DB SUB18H

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