|   Okay !...REALLY dumb question coming.... | Tom Bombadil
Dec 11, 2002 8:50 AM | | IF we can imagine a simple wave - a Sine wave - let us say at not too high a frequency - of some amplitude - let us also say...
Can we not think that it could be created by a composition of other frequencies by some formula of re-enforcing / cancelling. Thus, a transducer capable of producing some range of frequencies "could" - at least in theory be made {with sufficient up-front circuitry} to re-create just about any frequency ?
BUT the said transducer may not be able to recreate sufficient AMPLITUDE of that frequency. We would need a vast hordes of the said transducers to fire simultaneously {in phase} to create sufficient amplitude.
Thus would it be correct to say that the AMPLITUDE at low frequency is a fundamental problem faced by audio system thus requiring specialized devices (which we call "subwoofers" ?).
PS:
This is an alien species trying to understand how mankind operates...we have just landed on the 3rd rock from the Sun. |
| re: Okay !...REALLY dumb question coming.... | adioster
Dec 11, 2002 10:51 AM | | you are on the right track for the most part. every sound is the sum of a collection of frequencies. there are mechanical limits to the amount of bass a small speaker can reproduce. take a tweeter for example. for a 1" dome tweeter to produce 20hz at 90db the linear excursion of the driver would have to be quite large, perhaps, several feet in order to create the proper amplitude. how do you design a such a speaker? where would the surround material go? how do you keep such a violently moving cone rigid? the linear motor drive-would magnets have the dynamic strength? to produce bass it is easier to move a larger surface area a shorter distance at a slower speed. |
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