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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 13th September 2017, 06:42 PM   #421
Daihedz is offline Daihedz  Switzerland
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Originally Posted by gedlee View Post
The next big benefit that I have found is attention to diffraction in the room nearby the speakers. I always see photos of peoples setup with lots and lots of stuff all around the speakers diffracting away.
Question: So also a diffusor on the front wall between the speakers might rather be mixed blessings?
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Old 14th September 2017, 12:41 AM   #422
gedlee is offline gedlee  United States
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Yea, I would say that's true or maybe not mixed, perhaps sub-optimal. I try and completely absorb the rear wall reflections (behind the speakers). This seems to improve the imaging quite a bit. Rear wall reflections, coming from an axis close to that of the sound source, will be quite significant psychoacoustically. Best not to have them.
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Old 16th September 2017, 10:37 PM   #423
graaf is offline graaf  Poland
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"Diffraction, which occurs at every sharp cabinet boundary, creates delayed, reverse-phase phantom sources that interfere with the direct sound from the actual driver. These secondary phantom images create significant ripples in the midrange response (up to 6 dB) and create delayed sounds which disrupt the timing cues necessary to perceive stereo images. These dispersion problems are audible as room-dependent colorations, coarse midrange, diffuse stereo, and a "detenting" effect that pulls images in towards the loudspeaker cabinets."

The Art of Speaker Design
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Old 17th September 2017, 12:49 PM   #424
graaf is offline graaf  Poland
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Spica

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Old 17th September 2017, 06:17 PM   #425
scottjoplin is offline scottjoplin  Wales
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Can anyone refer me to scientific studies on the audibility of diffraction?
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Old 17th September 2017, 06:19 PM   #426
bwaslo is offline bwaslo  United States
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What are some good example of baffle design to improve diffraction
I've measured the effect of heavy felt like that. It was surprising how much like a piece of solid wood it behaves at mid to high frequencies!
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Old 17th September 2017, 07:12 PM   #427
graaf is offline graaf  Poland
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Originally Posted by bwaslo View Post
I've measured the effect of heavy felt like that. It was surprising how much like a piece of solid wood it behaves at mid to high frequencies!
angle of incidence?
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Old 17th September 2017, 07:27 PM   #428
Bon is offline Bon  Australia
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My baffles are based on Olson's baffle shape fig 2L, fig 17 which compare very well to a spherical baffle fig 2A, fig 6 of his AES paper.
http://www.aes.org/aeshc/pdf/how.the...enclosures.pdf
I now cast the baffle from a resin/bentonite composite which has a superior damping performance compared to wood based materials like mdf or ply.
damping factor values - audio qualia
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Old 17th September 2017, 07:36 PM   #429
bwaslo is offline bwaslo  United States
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What are some good example of baffle design to improve diffraction
Quote:
Originally Posted by graaf View Post
angle of incidence?
Pretty much as shown in your photo. Got strong reflections agreeing with distance from driver center to edge of felt. (Need to look at impulse response to see)
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Old 17th September 2017, 07:56 PM   #430
graaf is offline graaf  Poland
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Quote:
Originally Posted by bwaslo View Post
Pretty much as shown in your photo. Got strong reflections agreeing with distance from driver center to edge of felt.
and after that? I mean - were there strong reflections agreeing with distance from driver center to edge of the actual baffle?
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