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Speaker Asylum General speaker questions for audio and home theater. |
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Speaker Asylum General speaker questions for audio and home theater. |
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In Reply to: wrong posted by taloyd on June 3, 2004 at 18:29:16:
Dear Tal,Let's put this to bed once and for all, Mount Everest has a resonance frequency, low yes, but it still resonates.
We can therefore reasonably conclude that everything resonates, there is no such thing as a speaker with no box (popular as the concept may seem, you have to mount the drivers in something, even if it is a panel driver), so we have essentially two choices,
1.) Build a box that minimises the resonant behaviour by applying mass, which does nothing useful in most cases, because whilst a lower resonance frequency at lower amplitude may look great on a waterfall graph, the reality is that it prolongs the amount of time the resonant energy is present, which leaves it present for long enough to disturb the replay.
In addition, damping is "stupid" in the sense that it removes both the sounds you want and the ones you are trying to get rid of.
2.) Build a cabinet which has a fast enough recovery time to stay within the human ear's time constant, that is, be close enough to the original note, to be indistinguishable by the human ear.
Method no. 2.) is much much harder to apply, as working out how to RAISE the resonance frequency and shorten it towards inaudibility requires hundreds of hours of experimentation AND does provide beautiful waterfall graphs with which to present your latest resonance removing technique as another breakthrough of "innovation" with which to sell next years crop of speakers with.
All our measurement methods and conventions dictate that making the cabinet heavier is better, unfortunately the truth is that it is a convenient, but poor way of solving the problem.
Sincerely,
Peter Qvortrup
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Follow Ups
- Re: wrong - Peter Qvortrup 04:17:09 06/06/04 (0)
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