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<blockquote data-quote="PowerNaudio" data-source="post: 1292746" data-attributes="member: 561215"><p>tapering the internal corners makes it is possible to eliminate standing waves and resonance common to other speaker enclosures.</p><p></p><p>Eliminating standing waves also protects the driver from harmful back waves that cause distortion and cone breakup.</p><p></p><p>For a standing wave to exist, the distance between parallel boundaries must be 1/2 the wavelength of the frequency at which the standing wave exists. Considering that sub-bass waves vary from 56.4 feet (20 Hz) to 11.28 feet (100 Hz),</p><p></p><p>Three types of standing waves affect all previously manufactured loudspeaker enclosures. The first and most powerful is the axial standing wave. The axial wave involves only two enclosure walls that are parallel to one another. Next in order of strength is the tangential standing wave which involves four enclosure walls that are parallel to one another. This type of standing wave has only half the energy of an axial wave (3db down). The last and least powerful standing wave is the oblique which involves six enclosure walls and it has only one fourth the energy of the axial wave (6db down).</p><p></p><p>How do standing waves degrade the performance of loudspeakers? A sound wave has a positive portion starting at 0 degrees to 180 degrees and a negative portion starting at 180 degrees. If the positive portion of the wave (i.e. compression) meets the negative portion (i.e. rarefaction), then the waves will combine and will be out of phase relative to each other. Likewise, if the positive portion of the waves meets another positive portion of the wave then the waves are in phase (i.e. the waves reinforce each other) the sound will be inordinately loud (i.e. the high pressure zone). Likewise, at locations in the enclosure where the sound waves are out of phase (one being negative and the other being positive) the sound waves cancel each other out and no sound will be heard (a low or no pressure zone).</p><p></p><p>edit: i just cut and pasted from searching</p></blockquote><p></p>
[QUOTE="PowerNaudio, post: 1292746, member: 561215"] tapering the internal corners makes it is possible to eliminate standing waves and resonance common to other speaker enclosures. Eliminating standing waves also protects the driver from harmful back waves that cause distortion and cone breakup. For a standing wave to exist, the distance between parallel boundaries must be 1/2 the wavelength of the frequency at which the standing wave exists. Considering that sub-bass waves vary from 56.4 feet (20 Hz) to 11.28 feet (100 Hz), Three types of standing waves affect all previously manufactured loudspeaker enclosures. The first and most powerful is the axial standing wave. The axial wave involves only two enclosure walls that are parallel to one another. Next in order of strength is the tangential standing wave which involves four enclosure walls that are parallel to one another. This type of standing wave has only half the energy of an axial wave (3db down). The last and least powerful standing wave is the oblique which involves six enclosure walls and it has only one fourth the energy of the axial wave (6db down). How do standing waves degrade the performance of loudspeakers? A sound wave has a positive portion starting at 0 degrees to 180 degrees and a negative portion starting at 180 degrees. If the positive portion of the wave (i.e. compression) meets the negative portion (i.e. rarefaction), then the waves will combine and will be out of phase relative to each other. Likewise, if the positive portion of the waves meets another positive portion of the wave then the waves are in phase (i.e. the waves reinforce each other) the sound will be inordinately loud (i.e. the high pressure zone). Likewise, at locations in the enclosure where the sound waves are out of phase (one being negative and the other being positive) the sound waves cancel each other out and no sound will be heard (a low or no pressure zone). edit: i just cut and pasted from searching [/QUOTE]
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