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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: Making Speakers Efficient/Non Effecient posted by AudioSoul on January 31, 2016 at 16:58:33:
The benefit of making them "not so efficient" is that they can be made smaller AND produce some bass.
The first problem is that like many problems, there is a mutually exclusive factor, for example, one has the cabinet volume, electro acoustic efficiency, and low frequency cutoff. One can optimize any two of those but it's at the expense of the other. Consider the wall of science or Hoffman's law which says for sealed and vented boxes that for a given box volume and low corner, there is a maximum possible efficiency even using a "perfect" driver.
The "wall" can be seen when you consider that to lower the perfect speakers corner one octave and keep the same cabinet volume, one takes about a -9dB hit in sensitivity.
Size can come with a possible acoustic advantage if one avoids producing an interference pattern, directivity, which increases the size of the near field (where the sound directly from the speakers is considerably louder than the reflected sound that arrives later).
A problem one finds when directivity really is very important like large scale sound is that the size of the wavelengths changes about 1000:1 going from 20K down to 20Hz and making the directivity as close to constant over a wide span is very difficult. Small means directivity is possible only up high.
The home market like commercial sound IS about selling products and size is strongly an "impediment to sales" so much effort goes into making things that are thought to have the greatest likelihood of selling. Ironically in commercial sound, the popular thing is line arrays, systems where much of each drivers radiation is spent in destructive cancellation of energy from adjacent sources. One could argue here, it really is about selling the most drivers, boxes, amplifiers and dsp for a given task and not sound quality.
The portion of the home market interested in performance is still shrinking and many people don't know what a realistic stereo image is or have ever heard a mono phantom image so strong that one wasn't aware of and couldn't localize a right and left speaker. Part of this aspect also goes back to directivity, in some ways, we can hear "how" a source radiates.
Best
Tom
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Follow Ups
- RE: Making Speakers Efficient/Non Effecient - tomservo 07:38:56 02/03/16 (1)
- mono fun - Kloss 12:04:09 02/03/16 (0)
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