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Hi,
Just a newbie with a question? Why are most (or almost all) speaker designs flanked with multiple woofers/mids and single tweeters and not the other way around? Is there a flaw in designing speakers with multiple tweeters??Just a question
Follow Ups:
Dear ozgul,There are some speakers with multiple tweeters (such as line-source systems), but they are indeed rare.
The reason for this is that a speaker has to move more air to produce the equivalent amount of sound energy as the frequency decreases. The amount of air to be moved is proportionate to 1 divided by the square frequency. This means that a tweeter that starts playing from 2000 Hz (rather low for a tweeter) would only have to move 1/1600 of the amount of air that a woofer has to move in order to produce the same SPL at 50 Hz.
In practice, this means that the maximum SPL produces by a speaker depends on the amount of air its woofer(s) can move, and thus the advantage of multiple woofers. There is not much need for multiple tweeters, since they do not have to move a lot of air anyway.There is another reason for not using multiple tweeters - interferences. At high frequencies (short wavelengths), even the slightest difference in distance between the listener's ears and 2 radiation sources (tweeters) could cause phase addition or cancellation. For example, at 10000 Hz the wavelength is 34 mm (about 1.5"). A difference of 17 mm (3/4") between the distance of the tweeters would cause complete cancellation! This small deviation could be caused by even slight movements of the listener's head.
With woofers or midranges, the slight differences do not cause interferences, as at 1000 Hz it would take a 17 cm (7") distance to cause the cancellation.
Sincerely,
Yoav Gonczarowski
YG Acoustics
It is a matter of efficiency. A lot more energy is required for the lower notes than higher. Hence the greater number of woofers.Literally a bass note is 60-feet long compared to high notes which are merely inches long. Consider the amount of energy you must exert to get the sound out of a bass drum at a moderate listenable level. Then consider the amount of energy required to whistle.
If there were more woofers or equal number, most likely the speaker system would sound bright or hollow. The woofers provide presence (i.e. closeness to the performance). The balance of musical content woofer to tweeter is close to 4 to 1. That is the woofers need 4 times as much of the musical signal compared to that required by a tweeter.
I hope this is somewhat clear and helpful.
Dave Toatley
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