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Multi-Way Conventional loudspeakers with crossovers

What are some good example of baffle design to improve diffraction
What are some good example of baffle design to improve diffraction
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Old 28th August 2017, 01:40 AM   #21
DonVK is offline DonVK  Canada
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There are a number of studies for the lowest diffraction enclosures (ie. Olsen, Modern Sound Reproduction) often reprinted in other books.

Lowest diffraction is the sphere, followed by tapered back compound front like the speaker (Avalon Acoustic) in post#1. Even the tall narrow box is not too bad.
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Old 28th August 2017, 01:51 AM   #22
planet10 is online now planet10  Canada
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What are some good example of baffle design to improve diffraction
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Lowest diffraction is the sphere.
Olson did not test every shape. B&W has taken his studies further and the ideal shape is more like the teradrop they use in the Nautilus or that Eclipse uses for their FRs. Also backed up by studies on the shape of cars & bike helmets as further examples.

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Old 28th August 2017, 01:52 AM   #23
eriksquires is offline eriksquires  United States
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I think the wide baffle is not just about diffraction but about dispersion control. A good combination.
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Old 28th August 2017, 01:53 AM   #24
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What are some good example of baffle design to improve diffraction
I don’t know about dipersion control, but cerainly pushes bafflestep F(3) down.

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Old 28th August 2017, 02:14 AM   #25
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Quote:
Originally Posted by sootboots View Post
This sounds affordable. Can you show a pic or two as an example?

Thanks,
John
Not really, I had no need to take photos back then, though there were some on horn apps at one time, what I was normally damping, but a search turned up nothing other than this variation: http://www.12voltnews.com/wp-content...b-1024x502.jpg

.....then cover the baffle with this : The Foam Factory, Open Cell Foam, Speaker Foam, Filter Foam

This would be for mixing densities, otherwise just cut a hole in the big sheet. Note that overlapping the driver some can be beneficial, so plenty of options to try with each type driver.

A minimalist adaptation of shaped foam inserts [four pieces] to damp a 800 Hz horn in a cab recess [click on pictures to open, enlarge]: http://www.lansingheritage.org/image...l-19/page1.jpg

Another one I saw early on was a DIY multi-way that the mid, tweeters were in a minimalist tube assembly with a very rounded, carved foam overlay that looked awesome and combined with a foam cladded bass bin measured about as good as one could expect.

Anyway, fairly cheap, easy with lots of shape, density options assuming no strict WAF, etc., restrictions and can make or break how a speaker sounds in room, especially larger ones.

GM
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Old 28th August 2017, 12:09 PM   #26
Juhazi is offline Juhazi  Finland
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I would start a SFStradivarius clone project any day, IF I was allowed to put them in our living room. Same problem with Magico S5s.

P.s. foam on baffle helps only at high treble
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Old 28th August 2017, 05:35 PM   #27
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Depends on foam density.

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Old 28th August 2017, 06:39 PM   #28
Juhazi is offline Juhazi  Finland
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Ops, I meant the felt inserts on the baffle
David Ralph's Speaker Pages - Felt Effects on Baffle Diffraction
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Old 28th August 2017, 06:58 PM   #29
Juhazi is offline Juhazi  Finland
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And about baffle diffractions - the best way to avoid them is tu use a dipole or cardioid system below it's dipole peak range! Then we don't encounter edge diffractions until we reach say 6kHz with a minimal baffle width! This means usually a 4-way construction like Linkwitz's LX521 or Kreskowsky's NaO Note II! My attempt in this genre is in my signature AINOgradient

The principles of a dipole multiway speaker are well explained by Rudolf Finke at his homepage Dipolplus - Alles über offene Schallwände (in PDF in English
http://www.dipolplus.de/downloads/Open%20baffle%201.pdf )
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Old 28th August 2017, 07:49 PM   #30
andy2 is offline andy2  United States
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I would start a SFStradivarius clone project any day, IF I was allowed to put them in our living room. Same problem with Magico S5s.

P.s. foam on baffle helps only at high treble
That is the thing - a good baffle design that not only minimize diffraction but looks good too. There are some good designs on this thread but either they are not easy on the eyes or too difficult to make for DIY. As for the Stradivari, it may eliminate some of the diffraction issues, but introduces other problems. I don't think the wide baffle images very well. I actually have the Stradivari clone and especially at low frequencies, there are some phasy things that shifts the image around. Maybe it's my room but a pair of good monitors don't have this problem on the same setup.
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