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Multi-Way Conventional loudspeakers with crossovers

Curved speaker wall geometry
Curved speaker wall geometry
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Old 12th July 2017, 10:20 PM   #1
LinuxGeek is offline LinuxGeek
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Default Curved speaker wall geometry

Hi guys,
i received way too much mdf, so new speakers will be born. This time i will try something dfferent. Multilayer curved speakers. Not very efficient, if you see how much wood gets destroyed, but i dont know where to store it at the moment, so Thats not a problem.
I have seen this wall geometry somewhere and will try it myself, but my question now is :
Should i use this geometry also in the bass reflex tube or should it be smooth and round ? Did someone already try this kind of bass tube ?
It will be a 46 layer thing when ready .
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Old 16th July 2017, 08:41 PM   #2
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Hmm,
Really noone has any experience with his kind of wall geometry ?
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Old 16th July 2017, 08:46 PM   #3
Bigun is offline Bigun  Canada
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Curved speaker wall geometry
Curves I get, but all those internal bobbly bits ? I've never tried it but my first impression of this approach is a solution looking for a problem - I'm rather skeptical about the benefits when perhaps foam is a better option (look at cutaway drawings of PMC speakers for example).
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Old 16th July 2017, 08:47 PM   #4
GM is offline GM  United States
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Not me, ports normally ideally need to be as efficient, friction free as practical, so round and smooth bore.

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Old 16th July 2017, 08:52 PM   #5
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Thanks for your answers.
Ive seen this kind of design here : Sammy
My goal was just to create curved speakers, but after seeing the pbn design, i thought about giving it a try.
The BR tube thought was because i hear the air move throught the tube in my old speakers. I thought, perhaps with the "egg" pattern there will be less port noise.
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Old 16th July 2017, 09:02 PM   #6
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So GM, you think a smooth br tube could be better, because of less friction ?
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Old 16th July 2017, 09:29 PM   #7
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The reason you here port noise, is because the port is to small a diameter for the volume of air. My guess is you don't hear the air at lower SPL.
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Old 16th July 2017, 09:41 PM   #8
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Quote:
Originally Posted by bungelow_ed View Post
The reason you here port noise, is because the port is to small a diameter for the volume of air. My guess is you don't hear the air at lower SPL.
Yes, its the diameter, but its impossible to use a greater diameter, without running into resonance problems. If i increase the diameter, the port gets way too long.
I hoped to disturb the aitflow with the egg pattern and perhaps the noise would be less then. If i loose low extension, its not worth, thn i will make the br tube smooth.
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Old 16th July 2017, 10:04 PM   #9
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LOL! I can't count the hours I've spent trying to cheat the laws of physics when it comes to port air speed. You've probably already thought of this, are both the port ends flared?
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Old 16th July 2017, 10:50 PM   #10
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Quote:
Originally Posted by bungelow_ed View Post
LOL! I can't count the hours I've spent trying to cheat the laws of physics when it comes to port air speed. You've probably already thought of this, are both the port ends flared?
Yes, they are. Both. Still way too much and too fast air .
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