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Multi-Way Conventional loudspeakers with crossovers

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Old 12th August 2004, 06:51 PM   #21
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and the baffles used:

Click the image to open in full size.

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Old 12th August 2004, 07:18 PM   #22
Bill F. is offline Bill F.  United States
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Interesting how well the truncated pyramid measures. And I would have thought the cylinder with driver side-mounted would have measured better than it does...
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Old 12th August 2004, 07:21 PM   #23
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I would expect that almost all shapes would do (much) better with the driver or exitation-hole mounted off-center. Was that addressed by Olson at all?

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Old 12th August 2004, 07:43 PM   #24
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Quote:
Originally posted by janneman
Was that addressed by Olson at all?
Not in this study... he did do some baffle placement studies thou (the one the comes to mind is open baffle).

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Old 12th August 2004, 08:14 PM   #25
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According to Rod Elliot placing the driver off center reduces the amplitude of some of the ripples but doesn't change the basic character. So, basically, optimize the baffle shape, then make final improvements via placement. Watch out for polar response changes in multiway systems though.
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Old 12th August 2004, 08:21 PM   #26
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Except for exploring off-centre on an open-baffle (where dipole cancellation dominates) Olson doesn't seem to cover off on this subject.

With tools like the Edge or the FRD baffle simulator it would be pretty easy for someone to do a virtual study and give us some baseline. (i'm not doing it -- these tools only work in Windoz)

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Old 12th August 2004, 09:34 PM   #27
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What about the egg? It's good enough for nature, is it good enough for us? How about placing a solid sphere in the center of a spherical cabinet to break up standing waves. Maybe an absorbent ball of fiberglass in the center would be even better.
Personally, I use rings of sonotube about 2" tall of different diameters glue to the larger panels of sub boxes. I lay them out in a random pattern and it makes the 3/4" mdf appear to be several inches thick without the weight. Try it, you'll like it! The sonotube is very rigid along the length and being a tube is self supporting.
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Old 13th August 2004, 09:13 AM   #28
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Default nice diagram!

nice diagram! it's realy truth.
it means - form of box is not affect for low end range like 10Hz-100 hz
the same way as damping materials inside.
it's for voice range of wave. it's for 120Hz and higher. another business.
low wave have another biiiig, biiiig problem
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Old 13th August 2004, 10:41 AM   #29
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Diffraction: the ultimate guide.

APPLICATION OF THE GEOMETRIC THEORY OF DIFFRACTION (GTD) TO DIFFRACTION AT THE EDGES OF LOUDSPEAKER BAFFLES, R.M. Bews and M.O.J. Hawksford, JAES, vol.34, no.10, pp.771-779, October 1986
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Old 13th August 2004, 06:28 PM   #30
markp is offline markp  United States
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That just deals with flat panels of different shapes. We are looking at 3-d shapes.
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