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Multi-Way Conventional loudspeakers with crossovers

Baffle Shape for Smooth Frequency Response
Baffle Shape for Smooth Frequency Response
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Old 29th May 2019, 01:28 AM   #1
solacedagony is offline solacedagony  United States
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Default 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?

Click the image to open in full size.

Last edited by solacedagony; 29th May 2019 at 01:31 AM.
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Old 29th May 2019, 02:05 AM   #2
Bill Coltrane is offline Bill Coltrane  Netherlands
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Click the image to open in full size.

Olsen in the 1950's came up with this.
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Old 29th May 2019, 02:11 AM   #3
solacedagony is offline solacedagony  United States
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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?
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Old 29th May 2019, 03:05 AM   #4
LineSource is offline LineSource  United States
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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.
Attached Images
File Type: jpg Al_Rounds TMWW1.JPG (210.6 KB, 680 views)
File Type: jpg avalon compas W15.jpg (75.1 KB, 676 views)
File Type: jpg 3W Rounds.jpg (222.4 KB, 670 views)
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Old 29th May 2019, 04:25 AM   #5
picowallspeaker is offline picowallspeaker  Italy
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Quote:
Originally Posted by solacedagony View Post
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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Old 29th May 2019, 05:24 AM   #6
celef is offline celef
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How about a very wide baffle?
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Old 29th May 2019, 06:17 AM   #7
Moondog55 is online now Moondog55  Australia
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Quote:
Originally Posted by celef View Post
How about a very wide baffle?
Poor mans Stradivarius?

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Last edited by Moondog55; 29th May 2019 at 06:18 AM. Reason: Add the missing link
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Old 29th May 2019, 06:42 AM   #8
Pida is offline Pida  Czech Republic
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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
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Old 29th May 2019, 11:21 PM   #9
InOtIn is offline InOtIn
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Quote:
Originally Posted by Pida View Post
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--vis each other? Also of the WO24P since you chose to sell it.
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Old 30th May 2019, 12:15 AM   #10
solacedagony is offline solacedagony  United States
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Quote:
Originally Posted by picowallspeaker View Post
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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