Baffle Shape for Smooth Frequency Response
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 Multi-Way Conventional loudspeakers with crossovers

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 29th May 2019, 01:28 AM #1 solacedagony   diyAudio Member   Join Date: Sep 2006 Baffle Shape for Smooth Frequency Response I'm building a 3 way speaker with Satori drivers and for fun, I've been simulating different baffle shapes in VituixCad with the goal of smooth frequency response. I ended up coming up with this baffle shape which seems to give a smoothish response. My thought is that if the baffle dimension is constantly changing radially with the correct change function, you should be able to get a smooth response. I just made the change function linear because I wasn't sure what the correct one is although I'd guess exponential or logarithmic would be the right one. I made the longest dimension the crossover frequency. I was also surprised that even on a rectangular baffle if the speaker placement is right, you can pretty well smooth the response. Any thoughts on this? I haven't listened or measured it yet. Are there any other shapes I should look into or experiment with? Last edited by solacedagony; 29th May 2019 at 01:31 AM.
 29th May 2019, 02:05 AM #2 Bill Coltrane   diyAudio Member   Join Date: Oct 2018 Olsen in the 1950's came up with this. __________________ Subjective measurements with the proper protocol is the only thing that matters.
 29th May 2019, 02:11 AM #3 solacedagony   diyAudio Member   Join Date: Sep 2006 Thanks for the graphs Bill! I was also going to build a sphere for experimentation because I've never heard a speaker with a spherical enclosure. I'm guessing the charts assume a point source. What would a driver with a finite cone area do to the response?
LineSource
diyAudio Member

Join Date: Sep 2003
Location: SiliconValley
2" - 3" radius quarter round machining on Left / Top / Right baffle edges is used on:
Kii-3
Vapor cabinets
Magico cabinets
B&W 802
=====
Side woofer(s) are used to allow modest width front baffles when large radius / bevel cuts are used to reduce diffraction.

The truncated pyramid bevel cuts as used by Avalon have proven low distortion advantages and artistic value.
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picowallspeaker
diyAudio Member

Join Date: Apr 2007
Quote:
 Originally Posted by solacedagony I was also going to build a sphere for experimentation because I've never heard a speaker with a spherical enclosure.
Wait! You started with the baffle -so projection of the waves forward only; now considering the enclosure, you put into the "equation" the front wave, the backwave, the front wave travelling in space and returning to the enclosure-and then back again.
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 29th May 2019, 05:24 AM #6 celef diyAudio Member   Join Date: Nov 2012 How about a very wide baffle?
Moondog55
diyAudio Member

Join Date: Jun 2007
Location: Norlane; Geelong: Victoria: Australia
Quote:
 Originally Posted by celef How about a very wide baffle?

Poor Man'
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Last edited by Moondog55; 29th May 2019 at 06:18 AM. Reason: Add the missing link

 29th May 2019, 06:42 AM #8 Pida   diyAudio Member   Join Date: Mar 2006 Location: Brno Larger radius or elliptical rounding are probably the best, and moreover it looks good. If you add waveguide it will be even better. For example, 170mm WG and edge rounding 30mm, 220mm wide baffle. See some of my projects: PKAudio: DIY loudspeaker projects
InOtIn
diyAudio Member

Join Date: Apr 2013
Quote:
 Originally Posted by Pida See some of my projects: PKAudio: DIY loudspeaker projects
Petr,

That's some really impressive builds you've got there, both physically and electrically. Will definitely bookmark your website and follow your progress on the ones still in development. Just wish the whole site would have English translation.

Since you've played with all three, what's your subjective perception of the NE123, MR16P and the 12MU vis-à-vis each other? Also of the WO24P since you chose to sell it.

solacedagony
diyAudio Member

Join Date: Sep 2006
Quote:
 Originally Posted by picowallspeaker Wait! You started with the baffle -so projection of the waves forward only; now considering the enclosure, you put into the "equation" the front wave, the backwave, the front wave travelling in space and returning to the enclosure-and then back again.
If I understand what you're saying correctly, I didn't factor in frequency response of the driver itself, the effect of the enclosure on the low end rolloff, the off axis response and reflections? That is true, I'm still learning a lot and taking it piece by piece. I am a relative noob at all this.

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