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Old 7th January 2010, 07:53 AM   #51
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Quote:
Originally Posted by CLS View Post
How can 1 & 3 above be done?
For 1 - a variation of the EnABL process.
For 3 - PM me for that one (sorry)

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Old 7th January 2010, 03:22 PM   #52
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It would still serve the same function as the surround. The motion must reduce to zero somewhere.
Sure. But I was thinking about the sonic advantages. The cone would not be reflecting off anything and there would be no transition from pistonic to non-pistonic movement.
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Old 7th January 2010, 08:08 PM   #53
thadman is offline thadman  United States
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Sure. But I was thinking about the sonic advantages. The cone would not be reflecting off anything and there would be no transition from pistonic to non-pistonic movement.
At the interface between the cone and spider, an impedance match exists just as an impedance match exists at the cone-surround interface. This interface will possess resistive as well as reactive components. Energy will be reflected back into the cone due to the reactive components. There is no free lunch here. Motion must reduce to zero somewhere, otherwise it will not be moving in reference to anything and no pressure variations (ie sound) will result.
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Old 7th January 2010, 08:19 PM   #54
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I'm not trying to force you to think it's a good idea. I'm building one; in the spirit of DIY.
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Old 28th April 2010, 06:56 PM   #55
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check out this break up behavior:

Click the image to open in full size.

Response is gated at 3 milliseconds, 1/12 octave smoothed, one meter at the top of the basket from 11.25 degrees off central axis to 90 degrees in 11.25 degree steps. I think this shows why measuring well off axis is important.

Anyone know of this is typical behavior? Anyone else want to post some graphs for public viewing?

Dan
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Old 29th April 2010, 12:37 AM   #56
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Click the image to open in full size.

could this also have something to do with baffle edge diffraction?
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Old 29th April 2010, 02:00 AM   #57
CLS is offline CLS  Taiwan
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Quote:
Originally Posted by InclinedPlane View Post
Sure. But I was thinking about the sonic advantages. The cone would not be reflecting off anything and there would be no transition from pistonic to non-pistonic movement.
A cone without surround, hmm... isn't that (sort of) a big whizzer?

As the wave propogating, a free edge has the same reflection amplitude as a solid wall, doesn't it?

So, eventually, the breakup would probably be more complex (if not stronger).
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