Tapped Horn Cabinet for 16 Hz. organ speaker - diyAudio
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Old 22nd July 2015, 12:59 PM   #1
Bach On is online now Bach On  United States
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Default Tapped Horn Cabinet for 16 Hz. organ speaker

A few may have seen the rather long thread where I've been receiving lots of good advice on building speaker cabinets for adding digital sounds to our existing pipe organ. We are about to go live with that project in the next few weeks. But I'm anticipating that our two bass cabinets - though they can deliver 16 Hz., may not provide enough volume to balance the upper frequencies of the organ.

So I'm exploring a possibility suggested by a poster to build a tapped horn. I've split this project off from the other thread. Anyone who wants the background info can check out the original thread elsewhere on this forum. Here's a link to it, but don't expect to read it all unless you've got a week to kill and are of a masochistic nature. It's pretty long and drawn out.

16 hz for church organ

I freely admit that I'm not the best carpenter who ever lived, though I can usually follow a blueprint. And I do have the essential power tools to build a more complex cabinet. But I do best when I have a design with dimensions.

The goal is to build a tapped horn to deliver from say 16 Hz. to perhaps 50 Hz. The goal is to have a single cabinet that can deliver at least 100 dB. I view this as a Winter project that would be based on something like the Stereo Integrity HT18 driver. Another possible candidate is the Dayton UM18 22 Ultimax. From a cost and power handling standpoint, the SI HT18 would be my first choice.

HT18 18″ Subwoofer | Stereo Integrity

Dayton Audio UM18-22 18" Ultimax DVC Subwoofer 2 ohms Per Coil

I'm not trying to re-invent the wheel. Does anyone know of existing plans that I could build to meet my goals?

All advice and help gratefully appreciated.

Bach On

Last edited by Bach On; 22nd July 2015 at 01:09 PM.
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Old 22nd July 2015, 04:32 PM   #2
tb46 is offline tb46  United States
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Hi Bach On,

Here is just a very large (1184 L) tapped horn (TH) that has a constant flare rate (angle), to make it easy to build. I used the T/S parameters that we used for the SI HT18 in the other thread. Just for fun I went into the Hornresp Wizard, and added a little bit of damping material in the throat and mouth areas to possibly simulate losses that otherwise will not be part of the simulation. Then I went into the Filter Wizard and applied HP and LP filters to get a feel for the final SPL (2xPi) and displacement.

Regards,
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File Type: jpg TH_TRY1_Input.jpg (38.3 KB, 490 views)
File Type: jpg TH_TRY1_Wizard_SPL.jpg (26.6 KB, 483 views)
File Type: jpg TH_TRY1_Wizard_Displacement.jpg (25.5 KB, 476 views)
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File Type: txt TH_TRY1.txt (985 Bytes, 15 views)
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Old 22nd July 2015, 04:39 PM   #3
Mark Kravchenko
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I see horn!

Maybe I can muddy the waters a bit.

How about full blown front loaded horn?
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Old 22nd July 2015, 04:47 PM   #4
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That horn would take up something the size of a small room
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Old 22nd July 2015, 04:52 PM   #5
Mark Kravchenko
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Kind of.

It tisnt small.
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Old 22nd July 2015, 05:13 PM   #6
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Quote:
Originally Posted by Bach On View Post
So I'm exploring a possibility suggested by a poster to build a tapped horn. I've split this project off from the other thread. Anyone who wants the background info can check out the original thread elsewhere on this forum.

The goal is to build a tapped horn to deliver from say 16 Hz. to perhaps 50 Hz. The goal is to have a single cabinet that can deliver at least 100 dB.

I'm not trying to re-invent the wheel. Does anyone know of existing plans that I could build to meet my goals?
Bach On,

The DSL DTS10 would be a good choice, it was available as a flat-pack kit, but there is enough build info that it could be easily reproduced if no longer available from DSL.

Danley DTS-10 "Super Spud" DIY kit - AVS Forum | Home Theater Discussions And Reviews

It gets low and loud enough that 16 Hz is no problem at all.

Art
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Old 22nd July 2015, 05:13 PM   #7
Mark Kravchenko
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Well I have a finished out in the wild design that pumps out the same SPL in an enclosure that is 17.5 x 32 x 92.

Many a gent has built it. And they all have permagrins.

And it has been presented in public, almost 5 years ago. And it is still talked about.

Oh, and it uses a 12 inch driver.

If I reworked it for a 15 it would pump out about another 5 db louder.
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Old 22nd July 2015, 05:57 PM   #8
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^ got a link? I have 4x jbl gto1514 4ohm svc and an inuke 3000dsp that i need to build a home theatre subs out of.

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Old 22nd July 2015, 06:07 PM   #9
Mark Kravchenko
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The link is in blue.

Drop me an email.
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Old 22nd July 2015, 07:13 PM   #10
tb46 is offline tb46  United States
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Hi Y'all,

All good suggestions. Also, there is the 212 Kraken as mentioned in the other thread.

I suggested the TH in Post #2 as the OP asked for a TH, and would prefer the SI HT18. It's just a first stab @ a single fold. It would not be small either, my first guess (no drawing yet) would be 24in x 32in x 125in. The SI HT18 would require a rather large rear chamber in case of a standard end-loaded horn, obviously doable, but not your ideal horn driver.

Regards,

P.S.: One of bjorno's favorites the T-TQWT would work nicely @ 400 L, about 115 dB @ 16Hz, or so.
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Last edited by tb46; 22nd July 2015 at 07:21 PM.
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