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I'm still working on the R&D of a new DIY main speaker project and I can't decide which type of enclosure to use for the Scan-Speak 8545 or Revelator woofers I plan to buy. I have decided to go a little unconventional in the enclosure design and have been looking at nearly every speaker manufacturers box designs and have noticed a lot of speaker manufacturers are building boxes that are anechoic or quasi-anechoic like Sonus Faber, Anthony Gallo, and Jean Marie Reynaud's Odyssee speakers to mention a few, anyway I also notice that new materials are also being used for enclosures such as CAT speakers, they use some kind of resin that is about 104lbs per cubic foot. To build something with a odd shape like a sphere or cone or even drum shape isn't practical with MDF, so I am looking for some kind of resin that would be suitable to poor in a home built mold, I've even thought of carving out a stump like nOrh but this amount of work and time to hand carve does not appeal to me, anyway I cant afford to pay my self $2 a day (just kidding) so I had some questions regarding materials and methods.My questions would be
1) Is a Sphere an anechoic chamber or even a good acoustic environment for a mid/woofer?
2) Will fiberglass resin do well for making a enclosure, or is there some other material that might work better.
3) Can I use flexible tubing for a wave-guide in a transmission line enclosure?
4) Will as D-Appolito config give the vocal region more presence or make any difference other than increased efficiency and power handling.If a use a sphere enclosure I'm thinking about using a basket ball as a former to pour the resin around then I can deflate the ball and remove the skin hopefully I then plan to build a more decorative box around the ball shape and some how fill the dead area between the resin sphere and the box with some kind of home maid slurry or heavy damping material.
Have I lost my mind or am I over complication matters I wonder if any of these construction methods will make any audible sonic difference at all.? Any comments would be appreciated.
Follow Ups:
I am not quite sure what you mena by an anechoic speaker enclosure.An anechoic chamber attempts to absorb all the sound within it, so as to allow no refelctions to contaminate measurements. If by use of this phrase, you mean a speaker enclosure that absorbs all of the back wave, then one might consider either the acoustic suspension (sealed box completely stuffed with absorbing amterial), or the acoustic labyrinth. A labyrinth is NOT a T-line, but attempts to guide and dissipate all the back wave energy.
As for the use of a sphere, this is due to the outer shape of the enclosure minimizing diffraction effects, and allowing a smooth FR (assuming the driver is smooth to begin with). From the standpoint of the inside fo the sphere, it is one of the worst shapes, as the dimension across the sphere is exactly the same in all directions. Unless it is filled with a decent sound absorbing material, it will have a very strong standing wave mode.
A more ideal situation, would be an enclosure that was spherical on the ouside, and a golden rectangle on the inside, or some other mathmatically odd shape.
Jon Risch
Thanks for your input I posted a response at AR http://www.audioreview.com/message/cgi-bin/dcforum/dcboard.cgi?az=show_thread&om=826&forum=DCForumID3&omm=8
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