After a break from speaker building, I got an idea to try something that is not very commonly seen. A triangular dual flare MEH. If it will be ever built, I will most probably start with two mids and one bass unit without any back chambers. First rendering tells me this would be definitely an eye catcher:
And a partial side view:
The two mids (3FE22) will be mounted on the left and right sides, the woofer from the top. Not decided on the woofer yet, it will be an 8" or 10" depending on how large I can make the panels.
And a partial side view:
The two mids (3FE22) will be mounted on the left and right sides, the woofer from the top. Not decided on the woofer yet, it will be an 8" or 10" depending on how large I can make the panels.
That might be interesting mounted in the triple-corners (of 2 walls and the ceiling or floor).
I am still working on the parametric model. Triangular shape brings more trigonometric challenges than a rectangular one. I even had to use AI for consultation🙂
@bwaslo I unfortunately have no suitable corners I could use - but theoretically, what would be the ideal angles for a corner like that? I would assume that one should aim for continuous expansion (or having the walls as natural horn extension) and then the exit angle would be relatively small and there would be not much space for the drivers.
I am considering a triangular bass unit - it could be sealed, bass refex with port along the floor or triangular H frame open baffle - the full system would look like two triangles on top of each other resembling a hourglass.
@bwaslo I unfortunately have no suitable corners I could use - but theoretically, what would be the ideal angles for a corner like that? I would assume that one should aim for continuous expansion (or having the walls as natural horn extension) and then the exit angle would be relatively small and there would be not much space for the drivers.
I am considering a triangular bass unit - it could be sealed, bass refex with port along the floor or triangular H frame open baffle - the full system would look like two triangles on top of each other resembling a hourglass.
The model is almost finished, I am now playing with the dimensions - it seems I could fit an 8PE21 there (and two mids in case they would be needed). The intended size is around 75 cm mouth width.
A right angle room corner forms a trirectangular tetrahedron, the dihedral angle of that is 70.53 degrees:
Danley's conical horns generally mimic the classic Keele CE (Conical Exponential) secondary conical horn flare which doubles the included angle of the first conical part for the last 1/3 of the horn.
https://www.xlrtechs.com/dbkeele.co...AES Preprint) - Whats So Sacred Exp Horns.pdf
Using that model, the dihedral angle would be divided in half, approximately 35.265 degrees for the first horn section.
Rather narrow for typical home use, and would require a hole cut in the room corner to fit it.
A folded bass horn could have the initial narrow section of the desired 1/4 wavelength enter the corner, with a reflector tetrahedron in the corner.
I don't think the polar response of a tetrahedral conical horn as depicted in your OP will be useful, the pattern being more narrow at the bottom than the top.
Art
I agree that the polar response would not be ideal. I am not sure if this is worth building. I will try to make a model of eight sided dual or triple expansion horn instead, it will be much more effective regarding panel size and the angles will be less steep as well.
The ones I simmed with ATH worked shockingly well:
This was really unexpected.
Over the weekend I came up with what seems to be a fairly innovative (albeit obvious) waveguide geometry.
I really wasn't expecting this to work, but it looks like it does, so thought I'd share it here.
What I came up with are triangular waveguides. Attached are some photos of the waveguide, reports generated using ATH and ABEC, and the 'raw' predicted response.
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I really wasn't expecting this to work, but it looks like it does, so thought I'd share it here.
What I came up with are triangular waveguides. Attached are some photos of the waveguide, reports generated using ATH and ABEC, and the 'raw' predicted response.
This was really unexpected.