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Discussion Starter #1 (Edited)
Well, here we go again.

@Ricci likes designing crazy subs for us to build. I like building things.

Gjallarhorns: Built a pair of these four years ago (where did the time go....) to replace my DTS-10. Build thread here: http://www.avsforum.com/forum/155-diy-speakers-subs/1465617-triple-gjallarhorn-othorn-build.html - they are fantastic subs but when I moved to a new house they unfortunately do not fit.

As much as I enjoyed racing @lukeamdman to see who could drill pocket holes faster and get them done, @baniels decided to build a CNC in his garage because he is cool like that. Few months later and more money then he probably wanted to spend, we had a working machine.

Othorn: After some hand holding from @baniels on how to model things in Solidworks. Next thing I know I have an Othorn built: http://www.avsforum.com/forum/155-diy-speakers-subs/1481521-othorn-round-2-build.html - After that I fell off the map. Logged back into AVS a year or two later with a couple dozen requests for flatpacks in my inbox. Sorry about that guys...

New house: So I got a new house and I don't have room for the Ghorns. I made a thread asking for some advice: http://www.avsforum.com/forum/155-diy-speakers-subs/2635617-new-mains-we-going-big-small.html and everyone was super boring. "Go small, can't put a big sub there, etc etc etc"....

Enter the SKHorn:
The reason I keep logging back into AVS / Data-bass is to see if Josh has come up with something new.

Well, he has and I can fit it under my TV!: SKHorn

Note: This is a PA sub and not the ideal home theater sub.




I already have access to a pair of B&C 21SW152-4's to test it out so why not.

My turn to model it:



Few modifications and got the ok from Josh to make some sawdust:





Waiting on a part for the CNC so no more progress until Wednesday but it's happening :)

Edit: 2/4/17:

Build photos of first one here: http://www.avsforum.com/forum/155-diy-speakers-subs/2687769-skhorn-2.html#post49417345

Build photos of three more here: http://www.avsforum.com/forum/155-diy-speakers-subs/2687769-skhorn-5.html#post50052729 and here: http://www.avsforum.com/forum/155-diy-speakers-subs/2687769-skhorn-6.html#post50097585 and here: http://www.avsforum.com/forum/155-diy-speakers-subs/2687769-skhorn-6.html#post50113945

Finished second set here: http://www.avsforum.com/forum/155-diy-speakers-subs/2687769-skhorn-7.html#post50162577

Some quick measurements - Ricci's will be better: http://www.avsforum.com/forum/155-diy-speakers-subs/2687769-skhorn-8.html#post50360865
 

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Discussion Starter #4
Keeping an eye on the dust bin? :p

Looking good. The slots for amp storage is a great idea.
I want to fill up that dust bin. Damn 1/4" shafts...
 

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How do you get those drivers in there? I am guessing they go in before the last few braces but is it then a once they are in they are not coming out kind of deal?
 

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How do you get those drivers in there? I am guessing they go in before the last few braces but is it then a once they are in they are not coming out kind of deal?
That was my question too. I have built folded horns before and the cabs have access panels. Those are some expensive drivers; I would think you would want to recone them or whatever if you let the magic smoke out. Also, destroying such an awesome piece of cab engineering to get the drivers out is a real shame.

Also: Looking at the Hornresp FR chart it looks like the FR drops like a brick around 35Hz. Are you intending to use this cab for HT or for music? Sorry if I missed something...

That said: There is so much audio badassery on this forum...makes me proud just to witness it. *wipes tear away*
 

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Nice -very, very nice

when I first saw the fold, i immediately thought of the Decware WO32 but after reviewing that pic,

WRONG! -very, very wrong . . .

what got my attention there was this: (red my emphasis)

"The WO32 subwoofer brings musical truth to bass in a way that all discerning audiophiles can appreciate.

To listen to it once is to understand the definition of speed."

Whaaaaa?

back to the drawing board

and subbed
 

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Looking at the Hornresp FR chart it looks like the FR drops like a brick around 35Hz.
That's because it's a band pass box. The pathway in front of the drivers resembles a horn, but it's way too short, and the mouth areas far too small, to work as one. Think of it as a manifold band pass with an extended manifold. Not that there's anything wrong with that, so long as it does what the OP wants it to do.
 

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Discussion Starter #15 (Edited)
How do you get those drivers in there? I am guessing they go in before the last few braces but is it then a once they are in they are not coming out kind of deal?
Here is a render of the back to make it more clear.



There is also space to do a cutout for the SP-6000 plate amp or the iPAL amp on the hatch. This way you can interchange hatches based on the situation.

Also: Looking at the Hornresp FR chart it looks like the FR drops like a brick around 35Hz. Are you intending to use this cab for HT or for music? Sorry if I missed something...

That said: There is so much audio badassery on this forum...makes me proud just to witness it. *wipes tear away*
I am going to use it for movies for a bit. My room is tiny and I have a raised floor with great gain. Seems the real use for this is large venues for music. I'm sure @Ricci can give you a better explanation. He mentioned that he thinks it will go lower once actually measured and there is the option to block a port to make the tuning lower. However, it's never going to be the ideal home theater sub solo. Currently you'd be tough pressed to beat the Gjallarhorn as a single sub for home theater duty since it strong down to ~15hz.

I hear you on the audio badassery. Always fun for me to learn from all you smart audio guys and see the cool stuff people make.

Looks incredible! Music only?
Thanks! See above :)
 

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The original horn resp that josh posted showed this digging deeper down to 25hz. Was that only with the ipal or did this design change?

 

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Discussion Starter #17
The original horn resp that josh posted showed this digging deeper down to 25hz. Was that only with the ipal or did this design change?

Not sure, I used the horn resp he posted after I said I had the SW152's so maybe it is the ipals? Perhaps he will chime in.
 

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That new pic you posted cleared up a lot of questions. Very smart design! Access cover for installing/swapping the drivers and the access cover is big enough to double as a mounting surface for a plate amp! How cool is that?

I'm not a math guy, but when I saw the pics/design of this sub, my gut said "for music." But down to 20Hz and maybe lower with room gain is still very acceptable, especially considering the SPL this cab can put out with the right amp. Quality over quantity...to a point...and then we all love some overkill. :D
 
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