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In the Forum: Horn-Loaded Speakers
In the Thread: Jessie Dazzle Project
Post Subject: Carbon...Posted by chaos on: 7/24/2008
its still expensive, but birch-plywood is not that much cheaper. its around 30-40 €/sqm. the only experience i have with a carbon-foam composite is from making a skateboard for my gf´s son. looks very good, but whats more important, absolutely rigid(he complained about it, feels bad when he is jumping down from a ramp, he fears loosing his theeth;-). made with to layers of unidirectional fiber on the bottom, probably to stiff for this application). and its sounds dead when you knock on it. dont know if this is good or bad, but i will never know before i try..
at least there are carbon-guitars out there, and their sound is not bad...
i exactly unterstand your liking of a circular throat, but this is not that annoying for me. what i dont like is the fact, that the lenght of the sidewalls are different, more so if you have 2 flat sides. i imagine the the spherical wavefronts expand along the horn and suddenly on 2 sides the "leading surface" is gone. if size would be no problem i would try a round mouth. dont have a real reason, but i feel the mouth is as important as the throat, its where it is coupled to the room. this is the reason i asked romy if there is a problem with a quadratical mouth. would be closer to a circle than rectangular. but i will have to run the horn up to 400 hz, so maybe its better to get the center closer to earlevel. for me, there are a lot of questions, but if one thinks to much, then he will end up like this lynn olson, pages and pages of endless talk and no horns...
my horn will be a compromise anyway, it will look like ulf´s horn with 2 flat sides, and made from carbon-composite board. will see what the wavefronts think about it;-)
i am quite sure that a concrete horn horn sounds good, but i have also aesthatical reason for not liking it. for me its simply not elegant to kill resonances with mass, its something like:if you cant do it with elegance, use a hammer.
did you think about making a nice (quarter?)core from foam? its much easier to work on the cores outside than on a horns inside and should be no great deal to cover with glass- or carbonfiber. would be easy to cover the rounded parts with aramid-honeycombs, they are quite flexible.but you would need a vacuum-pump.
regards,klausRerurn to Romy the Cat's Site