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Old 10th December 2012, 01:13 AM   #11
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At high frequencies a sharp turn is a problem...

An entry into a larger volume from a compression driver, without a smooth transition will also muck with the frequency response, the loading and create diffraction...

A drawing will serve to illustrate the OP's idea better...

btw, there are *no* "non-resonant" enclosures. the best you can do is to reduce the amplitude of HF energy. Unless you use a IB set up... maybe with the back side going outside, or to an anechoic chamber...

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Old 10th December 2012, 08:13 AM   #12
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Had gigs through wknd. I will be throwing up a crude windows paint sketch soon. I feel this is a unique design that might interest many of us. Perhaps the bend can be worked around, but with the bend this thing can be made with 6 pieces total and that *includes* horn and vent. I did not mean to imply this thing won't resonate at all, but I can guarantee you won't find a need for extra bracing.. hmmm while was typing this I realized I might be able enter the horn a the throat without the turn but it will mean the compression driver will not be in side of the structure and must actually cut partially into the mdf, that would not be elegant architecturallly. Now its time to put up a sketch.

Last edited by peteleoni; 10th December 2012 at 08:25 AM.
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Old 10th December 2012, 08:31 AM   #13
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Bear, I read your stuff, you have it going on. A lot of experience there. While not a soffit mount, this design will have many of the benefits, but venting the backside of the drivers to a hated neighbour however is not one of them . (-:
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Old 10th December 2012, 08:51 AM   #14
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Patrick Thank you. Your site is also invaluable.
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Old 10th December 2012, 05:19 PM   #15
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Peteleoni, thanks for the kind words. In truth I am struggling just like so many here to understand all of the details and subtleties. The problem seems to be that just as you start to think you actually *know* something there's another layer of onion awaiting...

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Old 10th December 2012, 06:36 PM   #16
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You are right Bear. Ok Here goes nothing, I am posting rough diagram, if we can work this thing out together, I will start a new Thread entitled "The TetraHorn" Where we can perfect this thing. I hope you guys like this, if we can pull this off we will have a speaker that anyone can quickly make, has very high efficiency, can help minimize room reflection problems has the possibility of deep clean bass with low overhead and in general should have some unique merits, both as a home theater speaker and as a recording studio monitor as it is uniquely scalable too. Here goes Pete Leoni's Tetrahorn, may the picking fest begin (-:
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Old 10th December 2012, 06:57 PM   #17
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Now you can see why I initially wanted to do the 90 somewhere near the apex, but on further thought, since this must stand some inches from flush to the wall due to the bass refex vent, is is possible to put the HF driver outside of the tetra box, and have no such turn. Not an elegant solution though one of the compromises I guess.When I was a kid, my mom said, "there are no perfect women, just find you one with a set of flaws that you can live with and hope you she does the same" Mother would have made a fine speaker designer (-:
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Old 10th December 2012, 07:11 PM   #18
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I was thinking 1" MDF, so the anti diffraction "lip" can simply be carved, another simplification, and since there are so few parts, the non resonant characteristics of heavy MDF would be welcome is this simple design. In fact, I doubt that this one needs anything but glue. I once owned a Grumman Yankee. It was strong as hell and this was a 1970's airplane. I feel that due to the "Bucky Fulleresque" use of equilateral triangles this thing will not be nearly as subject to resonance and shaking apart as a cube-y speaker. Glue should do it. One angle is what all that is needed for panels, and a jig must be built for a table saw. Can someone here figure out the exact angle? I think it is around 54.xxx degrees for the radius (from centroid to the center of any two vertexes) but I don't know the exact figure, and it is not the dihedral of course. My 6th grade education fails me here. (-:
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Old 10th December 2012, 07:20 PM   #19
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It is worth noting, that the vertical dispersion angle and depth (pattern/throw) of the regular triangular conical waveguide are altered simultaneously simply by resizing the bottom plate of the HF horn and extending to (duh) the front plane of the other two ( made from the top of the "box") It will still remain a symmetrical cone regardless. I would expect there will be sweet spot somewhere and that this should be a point of discussion.This of course, then alters the size of the woofer chamber because of horn displacement, so it gets interesting.

To elaborate:
Vertical angle and throw adjusted by depth/length of horn bottom plate. Horn mechanical cutoff by width (therefore size of mouth) of bottom plate. It's a regular triangle, so all planes fall into symmetry automatically.

A room corner is already an 8th space triangular conical horn, we are stuck with it anyway. I can't see how a triangular conical horn is that much of a drawback, maybe I'm wrong? This idea takes PWK's and extends it to the tweeter horn as well putting the tweeter in the corner eliminating back wash from wall, as it is virtually in the wall. Everything is still horn loaded to a degree, but all folds in horn are gone *except* for VLF bass reflex tuned vent, which will not suffer from folding at all. Not as efficient, but I would bet it could be cleaner in the mids than a K-horn. We now have electronic xovers and inexpensive clean power, luxuries when PWK did the Khorn. What we still need however, is a good portion of the dynamic range offered by horn loading. I feel that these properties make this idea a good compromise and worth exploring, hope you all do as well.

Last edited by peteleoni; 10th December 2012 at 07:49 PM.
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Old 10th December 2012, 07:39 PM   #20
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Quote:
Originally Posted by peteleoni View Post
You are right Bear. Ok Here goes nothing, I am posting rough diagram, if we can work this thing out together, I will start a new Thread entitled "The TetraHorn" Where we can perfect this thing. I hope you guys like this, if we can pull this off we will have a speaker that anyone can quickly make, has very high efficiency, can help minimize room reflection problems has the possibility of deep clean bass with low overhead and in general should have some unique merits, both as a home theater speaker and as a recording studio monitor as it is uniquely scalable too. Here goes Pete Leoni's Tetrahorn, may the picking fest begin (-:
Here's my attempt at something similar:

3 driver full range-1.mp4 - YouTube

Basically a corner horn with a triangular mouth. You could also make one with a round mouth that works the same way
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