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In Reply to: RE: Are these really myths... posted by chocolate_lover9999@yahoo.com on November 17, 2010 at 21:22:22
The problem I have with the basic premise of the article is that it is ridiculous to expect a short fat speaker and a tall thin one with the same driver, volume and port will tune anywhere near the same. Once the geometry deviates wildly from a cube, there are going to be standing waves to contend with. Once the dimensions that are normal for a floor-stander are reached, quarter-wave modes will dominate. Even though the designer may have intended the speaker to be a BR, the geometry is a mass-loaded transmission line. Now such things as driver and port placement become very important is damping higher order standing waves.
Now, if the floor-stander has separate chambers for woofer, mid, etc, them the above does not (necessarily) apply, but that is not what the author implies.
Bob
Follow Ups:
Of course when it comes to problems with standing waves a cube is the worst possible shape for a speaker. The ideal shape is that of an egg.
And you are indeed correct, but that was not my point. Virtually all box programs compute Helmholtz resonance based on a volume of unspecified shape. Unsuspecting designers that they can use any convenient dimensions so long as the volume remains the same. In fact, even a golden ratio box starts to show quarter wave modes.
Bob
Semantics aside, the point of Jim Salk's article (and he is a knowledgeable speaker designer) was that narrow baffle/wide dispersion floorstanders can image every bit as well as small standmount speakers. This seems rather obvious, but raises another question: can wide-baffle speakers like the big Magicos and Focals also image well? Though perhaps only in a narrower listener "sweet spot?" What design factors besides baffle width contribute to good imaging?
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I can think of one wide baffle speaker that images very well and produces the best soundstage I've ever heard: The JBL Everest II.
They're so wide that they house two 15" transducers side-by-side. Of coarse, these are horn loaded systems for all the mid, high and ultra high frequencies.
Living in The Land of the Sun
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