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RE: An excerpt from the DJ Society

63.16.35.38

In Reply to: RE: An excerpt from the DJ Society posted by Jay Buridan on October 30, 2007 at 04:51:08

The idea is to move the resonant frequency above the critical midrange bandwidth. That being said, examine the philosophy of the critically acclaimed Harbeth speakers. They use a simple 9 mm birch type ply without bracing for their cabinets which actually rings quite a bit. They claim that the resonant frequency is part of the design, but is high enough to be situated outside the critical mid band.

Most so called 'non resonant' cabinets are simply well braced, some with a double wall construction which usually raises the frequency either well above or well below audibility. They still resonate, hence the ability of devices like the Tekna Sonic to 'work'. As a matter of fact, that's why even cones work on speaker cabinets.

The 'rap' test is more a measure of cabinet bracing and strength of construction. The idea is not to eliminate resonance, which is impossible, but to control it and to transform it into a more benign form.

Stu

Follow Ups:

Interesting. What exactly is "above the critical bandwidth"?? (nt) - cheap-Jack 12:16:42 10/30/07 (1)
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- RE: Interesting. What exactly is "above the critical bandwidth"?? (nt) - unclestu52 19:14:21 11/05/07 (0)
  Generally, it s regarded as the range where the human ear is most sensitive and you can examine the loudness curves to get the approximate frequency ranges. Bear in mind, individual sensitivities will vary, but similarly, as with setting crossover points for a tweeter, most designers try to either move the resonant points beyond the mid range bandwidth. Most opt for lower frequency bandwidths, but there are speakers with granite cabinets, aluminum cabinets, even steel cabinets, but, of course, resonance is not only determined by material, but also by size and other details of assembly.
  
  Stu

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