That design looks really neat but all those fancy rounded bends serve no purpose as it's a rear-loaded horn intended to work only in the bass, 100 Hz or so and lower, while rounded bends and other reflectors have no effect below about 200 Hz or so. The smallest possible backhorn would be a spiral design with no space wasted on wide radius rounded bends.
Try this address
http://www.spnet.ne.jp/~hasehiro/product/backroadhorn.html
The Oracle - to the rescue
http://www.spnet.ne.jp/~hasehiro/product/backroadhorn.html
The Oracle - to the rescue
The source is a Japanese website:
http://www.spnet.ne.jp/~hasehiro/product/backroadhorn.html
Notice that it's a "backRoaded" horn. LOL
In the near future I'm going to try something similar, but with styrofoam except for the side panels of plywood. Hot wire cut the entire horn out of a block of styrofoam. Then epoxy and fiberglass for rigidity and smooth the pathway of the horn. If the first test shows I need more rigidity, then after cutting the horn, I can slice the styrofoam vertically into a few slices like the mdf horns pictures. Sandwiching some epoxy layers will definitely give sufficient rigidity combined with the interior surface covering. A truly easy to build very light back horn will be the final result.
I also have plans to do a styrofoam version of the Jensen Imperial back horn. For it I will have a narrow top and wide bottom, so no parallel walls, better throat shape, and what is usually a 300lb speaker will be well under 100lbs.
I bring these projects up because seeing the smooth horn contours of those layered mdf horns gave me the idea to use styrofoam. Initial tests of the strength of styrofoam with epoxy and fiberglass are very encouraging.
http://www.spnet.ne.jp/~hasehiro/product/backroadhorn.html
Notice that it's a "backRoaded" horn. LOL
In the near future I'm going to try something similar, but with styrofoam except for the side panels of plywood. Hot wire cut the entire horn out of a block of styrofoam. Then epoxy and fiberglass for rigidity and smooth the pathway of the horn. If the first test shows I need more rigidity, then after cutting the horn, I can slice the styrofoam vertically into a few slices like the mdf horns pictures. Sandwiching some epoxy layers will definitely give sufficient rigidity combined with the interior surface covering. A truly easy to build very light back horn will be the final result.
I also have plans to do a styrofoam version of the Jensen Imperial back horn. For it I will have a narrow top and wide bottom, so no parallel walls, better throat shape, and what is usually a 300lb speaker will be well under 100lbs.
I bring these projects up because seeing the smooth horn contours of those layered mdf horns gave me the idea to use styrofoam. Initial tests of the strength of styrofoam with epoxy and fiberglass are very encouraging.
Well at least I know where they come from. Try as I may, my Japanese is a bit weak to comprehend the construction details.johninCR said:
I feel I have adaquate skills to laminate speakers of this type. Can anyone help me with details to build a small pair of these. I have no driver preferences. Thanks
Phil
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