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. 🙄
http://www.diyaudio.com/forums/subwoofers/272833-16-hz-church-organ.html
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
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. 🙄
http://www.diyaudio.com/forums/subwoofers/272833-16-hz-church-organ.html
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:
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,
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,
Attachments
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
Attachments
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.
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.
^ 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.
Sent from my SM-G900I using Tapatalk
Sent from my SM-G900I using Tapatalk
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.
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.
Last edited:
Hi DrDyna,
I remember you build a T-TQWT of bjorno's design, and if I remember correctly, you liked it. 🙂
Here is a - much smaller than Post #2 - T-TQWT. Seems to suit the SI HT18 better than a standard horn.
As a single fold this would be easy to build.
Regards,
I remember you build a T-TQWT of bjorno's design, and if I remember correctly, you liked it. 🙂
Here is a - much smaller than Post #2 - T-TQWT. Seems to suit the SI HT18 better than a standard horn.
As a single fold this would be easy to build.
Regards,
Attachments
Oliver you are right in saying the HT18 is not suitable for a horn. If you need an immense rear chamber you are not getting the best bang for the buck.
Have any of you guys compared a tapped horn to other enclosures?
Say vented, sealed and front loaded?
Have any of you guys compared a tapped horn to other enclosures?
Say vented, sealed and front loaded?
I did, and I do..the t-tqwt is still the nicest sounding sub I ever put together. It won't win any awards for knocking stuff off shelves, but man it sounds nice.
Shazam! You guys are too much. I leave the house for 12 hours and you have already come up with several ideas.
Got choir practice. I'll look this stuff over and comment afterwards.
Many thanks!
BO
Got choir practice. I'll look this stuff over and comment afterwards.
Many thanks!
BO
You might not even need to use a TH for this, considering the bandwidth requirements. THs and the like were IMO designed to extend the bandwidth you'd get with a typical TL, by filling in a notch that can appear at the upper end of the passband. If we don't need to fill in that notch (i.e. the bandwidth of the TL is wide enough), then we don't need to use one of those alignments.
For example, here's a TL of about 620L that can give you 16 Hz at around 117dB and its bandwidth extends to 50 Hz. This should be a very easy build, if you use just one fold.
For example, here's a TL of about 620L that can give you 16 Hz at around 117dB and its bandwidth extends to 50 Hz. This should be a very easy build, if you use just one fold.
Attachments
First, you guys seem to be familiar with:
T-TQWT of bjorno's design
I am not. Would anyone be willing to explain?
OK. The SI HT18 is not a terrific candidate for a TH. What budget minded drivers would be better choices?
Mark has a design that produces "permagrins" - one that uses a 12 inch driver. I remember you saying something about it. Can you tell me more?
Brian suggests a TL of 620L would be a good choice. What's a TL? And how would it compare with a TH?
You guys know all this stuff and throw these abbreviations and terms like confetti. I actually do know a lot stuff. But I just don't know all your abbreviations. Sorry, but you're going to need to educate me if you are willing to try to help me.
Bach On
T-TQWT of bjorno's design
I am not. Would anyone be willing to explain?
OK. The SI HT18 is not a terrific candidate for a TH. What budget minded drivers would be better choices?
Mark has a design that produces "permagrins" - one that uses a 12 inch driver. I remember you saying something about it. Can you tell me more?
Brian suggests a TL of 620L would be a good choice. What's a TL? And how would it compare with a TH?
You guys know all this stuff and throw these abbreviations and terms like confetti. I actually do know a lot stuff. But I just don't know all your abbreviations. Sorry, but you're going to need to educate me if you are willing to try to help me.
Bach On
Tapped Horn vs Transmission Line
https://www.google.co.nz/url?sa=t&s...BhfJs8-hcSJA41cbQ&sig2=YyoVyGkWg5hAvVFZnE9aVg
https://www.google.co.nz/url?sa=t&s...ZJaNsZ6RqvP-Ue1Pg&sig2=cWJewCql0L2t0LL9xA_GLw
Sent from my SM-G900I using Tapatalk
https://www.google.co.nz/url?sa=t&s...BhfJs8-hcSJA41cbQ&sig2=YyoVyGkWg5hAvVFZnE9aVg
https://www.google.co.nz/url?sa=t&s...ZJaNsZ6RqvP-Ue1Pg&sig2=cWJewCql0L2t0LL9xA_GLw
Sent from my SM-G900I using Tapatalk
LOL, TL= Transmission Line.
They're all various forms of 1/4 wave resonators, The TL probably being the simplest of them all to build. FWIW, I think the TH or TL would probably be best for a 16Hz box - there's absolutely no chance of any port compression effects at the higher SPL levels you're shooting for with this project.
No matter what TH or TL you build, the peak output is going to depend on the driver's Vd (Sd * Xmax), and it's difficult to beat an 18" driver with 22mm Xmax for production of very low frequencies.
There's another design I hadn't considered - an OD-TL - a TL with the driver offset in the box. It's a bit more difficult to build, but it does address the first "notch" in the response that's characteristic of TLs (and vented boxes with large vents). Transient response is likely not to be great, but seeing that this is for *producing* rather than *reproducing* music, I don't think that will be an issue to worry about.
- Status
- Not open for further replies.