Back to cones: how about the Walsh soeaker? Omnidirectional and phase coherent! I have a pair of the older Sound Cylinders and they do produce a 3-D room-filling sound field unlike the typical box speaker! Astounding is the best word to describe them!
Speaker cone shape
Why are speakers cone shaped, apart from rigidity? To my mind the air being pushed by a cone would radiate at an angle inward toward the axis of the speaker and collide in the centre, which seems inefficient to me, and likely to cause some distortion of the sound. This may also cause interference to adjacent speakers on the same baffle. Would there be any advantage to having the surface flat, assuming you could maintain rigidity without increasing the mass? There must be modern capable materials out there.
Is the fact that the speaker is cone shaped that causes the volume to change counter intuitively as you move left and right in front of the speakers? What I mean by counter intuitively is when you move left the right speaker sounds louder and visa versa.
Is the fact that the speaker is cone shaped that causes the volume to change counter intuitively as you move left and right in front of the speakers? What I mean by counter intuitively is when you move left the right speaker sounds louder and visa versa.
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Great transient response, but frequency response is all over the map. His website dedicates much time to transients and location by transients, but seems to ignore all the other mechanisms for location that are frequency based. I guess it comes with the marketing territory. I can certainly appreciate the engineering of the driver. I have only heard them at an audio show. They were good. Not great, good. I found them no more or less realistic than other implementations. |
For some reason, as to which one of you will no doubt enlighten me, they sound even better when the 6.5" are wired out of phase with the 8" & 4".If you've copied an original crossover design then that driver would have been reverse polarity as well. Capacitors and Inductors alter the phase of the signal so it's not unusual to allow the signal for one driver to go 180˚ out and correct it at the driver. My only answer to your original question is that air doesn't flow through a driver so you can't apply the physics of a wing to a loudspeaker diaphragm. It needs to be stiff and light which is why a cone is a good choice of shape for a woofer or mid with a conventional voice coil. Electrostatic speakers are able to have flat diaphragms as the electromotive force is spread across the whole surface area. If you don't already own a copy The Loudspeaker Design Cookbook by Vance Dickinson is a good primer for the subject... more practical than theory but a good jumping in point. If you really want to get into the mechanics of sound diffraction then the Master Handbook of Acoustics is as good a place as any to start. |
"...Lincoln Walsh was a pioneering expert on radar design back in the Forties! I think he may have invented the perfect speaker!..." A good example for this thread on speaker cone design. Walsh's full range driver was very interesting but the cone was so big that there were problems with cone break-up and distortion at high levels. As a mechanical engineer, you can quickly surmise that all electro-mechanical drivers have trade-offs, nothing yet is the perfect radiator but the state of the art is still very very good. |
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