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Hi everyone.. I'm in the middle of building a set of La Scala clones and am fighting with myself over an issue dealing with the mid horn. I'm planning to build wooden tractrix horns and mate them with a pair of A-55G mid drivers. I'd like to build my horns with a 2" throat for possible future upgrades to a 2" driver, as well as making it a bit easier to sand and paint inside the horn.. the 1" throat horn design has a long thin neck and I can foresee trouble getting in there with paint and such. My quandary surrounds the mating of the A-55G driver to a 2" throat tractrix horn.. I can buy adapters that go from the 1-3/8" thread to a bolt on 2" exit.. but is it going to destroy the sound? Anyone have any experience with those adapters, or just some good old uninformed opinions? Cheers! Mike
I am throwing this out for those who've built and measured bass horns. I think Dinsdale was writing about the Klipschorn when he wrote this. Appreciate any opinions and observations from experience. Dinsdale, in "Horn Loudspeaker Design, Part Two (Wireless World, May 1974) wrote: "A plan view of a corner horn shows that the room itself provides a natural extension of the horn mouth. Many listeners have observed that comer horns can provide bass notes from fore-shortened horns, well below the limit dictated by the mouth area (footnote 25). It is tempting to reduce the mouth area still further below the 3dB limit established earlier and rely instead on the corner placement itself to supply the additional mouth area and horn length. In the author's experience, this technique cannot be justified because although the bass response is undoubtedly there, careful listening reveals an uneven response over the first two octaves above the cut-off frequency which will often detract from the realism offered by the horn. It is therefore recommended that in cases where overall enclosure size is a limitation, a correctly-designed horn with a cut-off frequency of (say) 80Hz will give a more satisfying and linear response than a foreshortened horn whose expansion constant has been set to 40Hz but whose length has been limited to give a mouth area corresponding to 80 Hz." Footnote 25 refers to Klipsch, P. W., "A Note on Acoustic Horns", Proc. /.R.E., July 1945. Later in the article, Dinsdale says that a 40 Hz corner horn must have a mouth of 1133 square inches, and a length of 15.3 feet for an exponential horn with a flare constant of 5. These tables are in Part 2 of the article. I have read elsewhere that "corner horns can "fudge" on the mouth size but not the length".