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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 30th May 2019, 12:16 AM   #11
solacedagony is offline solacedagony  United States
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Quote:
Originally Posted by celef View Post
How about a very wide baffle?
In wall infinite baffle?
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Old 30th May 2019, 12:18 AM   #12
solacedagony is offline solacedagony  United States
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Quote:
Originally Posted by LineSource View Post
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.
That appears to correspond with the graphs above for configurations J and L.
The side woofer is an interesting idea as a way to increase baffle response for lower frequency drivers by sacrificing depth for front baffle area. I'll have to look at off axis response of the midbass driver.
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Old 30th May 2019, 02:28 AM   #13
AllenB is offline AllenB  Australia
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A and J are similar in concept.
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Old 30th May 2019, 08:13 AM   #14
Pida is offline Pida  Czech Republic
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InOtIn, you have PM.

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Originally Posted by InOtIn View Post
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-ā-vis each other? Also of the WO24P since you chose to sell it.
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Old 30th May 2019, 01:24 PM   #15
Joel Wesseling is offline Joel Wesseling  Canada
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I have CNC'd Tweeter holders that are based on (a). Subjectively, the sound improvement is beyond only reduced ripples.
I'm examining 100mm high tooling for my shaper to cut shapes (a) and (j) in front and side panels.

I have yet to hear a waveguide or horn that did not subjectively degrade the treble with added noise floor or phasey characteristic - Baffle in front of a tweeter? Pida, curious as to what your experience is with waveguides as you said "it will be even better". Can PM if that's best.
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Old 30th May 2019, 01:55 PM   #16
picowallspeaker is offline picowallspeaker  Italy
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Quote:
Originally Posted by solacedagony View Post
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.
Nope, I was just saying that the speculation upon the emission of the speaker based on the geometry of the baffle ( and geometry of the cone itself) should focus only on emission & propagation of the ( front) wave.
Once you take the whole ( speaker+box+room= a box in a box) you include also the backwave and its effect, when enclosed, to the speaker ( movement).

The words that you used are very unkind What's that terminology ? Axis? Off-axis !? Frequency response ? AArrrgh
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Old 30th May 2019, 01:55 PM   #17
Pida is offline Pida  Czech Republic
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My working and listening experience includes only hi-fi dome and ring radiator tweeters in WG 170mm outer diameter and 30mm depth or smaller. I prefer waveguided tweeters, they provide both good measured performance and the sound I like.
"it will be even better" referred to diffraction mitigation. WG + rounded edges (>30mm roundover, or the quarter of ellipsis) provided the best result in that regard. The waveguides I used are quite shallow, so they are still sensitive to edges of cabinet.

Quote:
Originally Posted by Joel Wesseling View Post
I have yet to hear a waveguide or horn that did not subjectively degrade the treble with added noise floor or phasey characteristic - Baffle in front of a tweeter? Pida, curious as to what your experience is with waveguides as you said "it will be even better". Can PM if that's best.
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Old 30th May 2019, 01:59 PM   #18
scottjoplin is offline scottjoplin  Wales
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Quote:
Originally Posted by solacedagony View Post
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.
I wonder if anyone has tried somethings similar for OB, a bit simpler than flower petals
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Old 18th June 2019, 11:11 PM   #19
Mattes is offline Mattes  Germany
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Hi Scott,


I tried it in OB and like it a lot, but it wasnīt simple... at least not for me. Some experimentation lead me to the petals, but for sure easier to realize form could be found as well. A lot of the smoothness comes from the fact that the flower picks up the angle of the membrane with the least possible irritation - that has made quite a difference.


All the best


Mattes
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Old 21st June 2019, 10:04 AM   #20
Mattes is offline Mattes  Germany
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Hi Scott,


sorry, I couldnīt see the spiral picture, I have a pretty bad satellite internet connection here (in the Greenland Sea...). Obviously the spiral is easier to do, but as I have some trouble (nothing scientific, just feelings...) with asymmetrical polars, I went with the petals.

Rudolf and others claim correctly that the round shape is the worst case for OB, but the petals are a way to break up the single resonance AND to maintain symmetrical polars.
Sorry for the confusion with the spiral...


All the best


Mattes
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