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Multi-Way Conventional loudspeakers with crossovers

Baffle Diffraction
Baffle Diffraction
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Old 22nd November 2019, 10:35 PM   #531
Oneminde is offline Oneminde  Sweden
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Elipson was first (as far as I know) with implementations of cylindrical woofer and spherical midrange shape - Elipson 4040 from 1968

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Old 22nd November 2019, 10:38 PM   #532
andy2 is offline andy2  United States
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Originally Posted by wesayso View Post
Which shows me that you lack to give an example. It doesn't "happen" at 3.5 KHz, it happens over a frequency range. You'd be better off shaping the cabinet to avoid it so the tweeter won't have to suffer either.
Again, nobody said at one frequency. I used 3.5KHz as an example. I assume most people here know enough to understand diffraction does not happen at one frequency. If you keep going on and on about obvious stuffs, good luck.

You keep posting stuffs that are rudimentary and academic that not helping anyone.
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Old 22nd November 2019, 10:41 PM   #533
wesayso is offline wesayso  Netherlands
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You are the one claiming one could solve the problem by crossing below diffraction. But I'd assume one would want some sound above that crossover too. So how do you solve the diffraction from the tweeter above it? That's all I'm pointing out. Crossovers aren't a solution to a diffraction problem.
Nor will diffraction be the same if one moves a little off axis. So solve it as it can be solved, by avoiding it.
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Last edited by wesayso; 22nd November 2019 at 10:43 PM.
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Old 22nd November 2019, 11:00 PM   #534
andy2 is offline andy2  United States
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Originally Posted by wesayso View Post
You are the one claiming one could solve the problem by crossing below diffraction. But I'd assume one would want some sound above that crossover too. So how do you solve the diffraction from the tweeter above it? That's all I'm pointing out. Crossovers aren't a solution to a diffraction problem.
Nor will diffraction be the same if one moves a little off axis. So solve it as it can be solved, by avoiding it.
Whatever ...
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Old 22nd November 2019, 11:28 PM   #535
gedlee is offline gedlee  United States
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Originally Posted by lousymusician View Post
Is there a theoretical optimal shape for a roundover? Is a quarter circle better than, say, an elliptical profile that starts shallow and gradually steepens towards the side wall? I think the elliptical curve might at least look nice.

KEF gave the LS50 a gently curved baffle that terminates in a fairly sharp edge. Does that provide the maximum benefit for short wavelengths, then give up trying when the WL's get too long for any practical roundover to help?
These are good questions and I would suggest that anyone who thinks that they know the answer would likely be mistaken. The rule in diffraction is how large is the surface curvature relative to the wavelength. Hence this, of course, means that all frequencies see the edge in different ways. I have thought about this in every way that you can imagine and they all seem to be complex enough that it is hard to guess at the answer and I have not seen a study of such, so there is no data that I am aware of. Hence, I just stuck with a circle.
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Old 22nd November 2019, 11:37 PM   #536
scottjoplin is offline scottjoplin  Wales
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Have you considered how diffraction relates to open baffle speakers?
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Old 22nd November 2019, 11:39 PM   #537
Oneminde is offline Oneminde  Sweden
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As put forward by F Toole.

Sound Production vs Sound Reproduction.
Sound Production: The performance is the objective. It is ART happening in real time.
No two performances may be exactly the same.

Sound Reproduction: Reconstructing a captured performance for the benefit of the listeners,
whenever and wherever they choose to press "play". The goal is to do so with minimal change,
thereby preserving the "ART".
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Old 22nd November 2019, 11:47 PM   #538
gedlee is offline gedlee  United States
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Have you considered how diffraction relates to open baffle speakers?
It could be quite low if the two path lengths are identical. But slight variations could be a real problem. For two point sources there is no edge diffraction if they are placed symmetrically (and exactly out of phase.) But any variance will show up as diffraction. I've never really studied the problem as the dipole inefficiency at LFs is just not acceptable to me and the HFs are handled with a waveguide so the baffle isn't a huge issue.
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Last edited by gedlee; 22nd November 2019 at 11:49 PM.
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Old 22nd November 2019, 11:48 PM   #539
gedlee is offline gedlee  United States
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Originally Posted by Oneminde View Post
As put forward by F Toole.

Sound Production vs Sound Reproduction.
Sound Production: The performance is the objective. It is ART happening in real time.
No two performances may be exactly the same.

Sound Reproduction: Reconstructing a captured performance for the benefit of the listeners,
whenever and wherever they choose to press "play". The goal is to do so with minimal change,
thereby preserving the "ART".
Well said and oh so true!

My son is working as an intern at Harman this summer.
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Old 23rd November 2019, 12:01 AM   #540
scottjoplin is offline scottjoplin  Wales
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Originally Posted by gedlee View Post
It could be quite low if the two path lengths are identical.
That makes sense and is what I've been thinking, however it seems it causes the peaks and dips in response and why a rectangular baffle can help smooth the response Frequently Asked Questions Diffraction from baffle edges I'm wondering if this causes smearing of the image
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