4 way speaker with acoustic crossover

MisterTwister · 20th August 2011, 01:19 AM

I'm trying to make a 4 way speaker with acoustic crossover.
Well, it's probably going to be partially acoustic. Ideally there would be just three capacitors and some foam.
I like how enclosure shapes came out, design is accidental. I just rearranged parts of this waveguide TwisterSpeakers: Neo8 planar transducer in a waveguide

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picowallspeaker · 20th August 2011, 01:33 AM

So... the red baffle does it all ?!? Rifraction ,diffraction , small chamber ,lowpass ...

MisterTwister · 20th August 2011, 01:52 AM

yes, it's a special kind of baffle. red paint helps to reduce bad stray waves. and its shape completely eliminates diffraction.
it's not the final design, you'll see some other objects attached in front of transducers.

picowallspeaker · 20th August 2011, 02:04 AM

super aerogel pillows ?

Radugazon · 20th August 2011, 03:36 AM

sarcastic mode on : this could become a nice couple of Christmas trees, branches helping to control the polar.

sarcastic mode off : why not ? Finally something original, and all the horns and loads are also acoustical devices

PeteMcK · 20th August 2011, 09:06 PM

fantastic design, (monkey coffins are sooo boring)

badman · 20th August 2011, 09:15 PM

pretty looking drivers too

Good luck with it!

MisterTwister · 21st August 2011, 01:42 AM

Thanks ) Top three drivers are behaving according to the plan. Only caps and foam work fine, they just need to be better balanced.
The lower woofer(yellow line,unfiltered) is problematic, I need huge amount of foam to make acoustic low pass. I'll try to compress foam(make it denser)or look for another sound absorbing material.
firsst-test.gif

MisterTwister · 25th August 2011, 07:50 PM

Lower driver requires huge amount of foam or pillows to be low passed around 300hz. Probably closed cell foam could work, but unfortunately I don't have one.
I'm going to build bandpass enclosure for this driver (add another box with port)
Can anyone recommend a good free bandpass calculating software?

Overall this acoustic filter concept works very well, I've been using it in my car audio for several month.
I think that a simple block of foam can greatly improve sound of any cheap speaker, when placed in front of the drivers.

20th August 2011, 01:19 AM	#1
MisterTwister diyAudio Member Join Date: Feb 2006 Location: usa Blog Entries: 1	4 way speaker with acoustic crossover I'm trying to make a 4 way speaker with acoustic crossover. Well, it's probably going to be partially acoustic. Ideally there would be just three capacitors and some foam. I like how enclosure shapes came out, design is accidental. I just rearranged parts of this waveguide TwisterSpeakers: Neo8 planar transducer in a waveguide DSC_3078.jpg DSC_3085.jpg DSC_3081.jpg IMG_0052.jpg IMG_0053.jpg IMG_0056.jpg

20th August 2011, 09:06 PM	#6
PeteMcK diyAudio Member Join Date: Feb 2002 Location: Sydney	fantastic design, (monkey coffins are sooo boring) __________________ ‘today… there lives alongside the twentieth century the tenth or thirteenth. A hundred million people use electricity and still believe in the magic power of signs and exorcisms” Trotsky

20th August 2011, 09:15 PM	#7
badman Custom Title diyAudio Member Join Date: Sep 2003 Location: Sunny Tustin, SoCal	pretty looking drivers too Good luck with it! __________________ I write for www.enjoythemusic.com in the DIY section. You may find yourself getting a preview of a project in-progress. Be warned!

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20th August 2011, 01:33 AM	#2
picowallspeaker diyAudio Member Join Date: Apr 2007	So... the red baffle does it all ?!? Rifraction ,diffraction , small chamber ,lowpass ...

20th August 2011, 01:52 AM	#3
MisterTwister diyAudio Member Join Date: Feb 2006 Location: usa Blog Entries: 1	yes, it's a special kind of baffle. red paint helps to reduce bad stray waves. and its shape completely eliminates diffraction. it's not the final design, you'll see some other objects attached in front of transducers.

20th August 2011, 02:04 AM	#4
picowallspeaker diyAudio Member Join Date: Apr 2007	super aerogel pillows ?

20th August 2011, 03:36 AM	#5
Radugazon diyAudio Member Join Date: Aug 2010 Location: Sulawesi	sarcastic mode on : this could become a nice couple of Christmas trees, branches helping to control the polar. sarcastic mode off : why not ? Finally something original, and all the horns and loads are also acoustical devices

21st August 2011, 01:42 AM	#8
MisterTwister diyAudio Member Join Date: Feb 2006 Location: usa Blog Entries: 1	Thanks ) Top three drivers are behaving according to the plan. Only caps and foam work fine, they just need to be better balanced. The lower woofer(yellow line,unfiltered) is problematic, I need huge amount of foam to make acoustic low pass. I'll try to compress foam(make it denser)or look for another sound absorbing material. firsst-test.gif

25th August 2011, 07:50 PM	#9
MisterTwister diyAudio Member Join Date: Feb 2006 Location: usa Blog Entries: 1	Lower driver requires huge amount of foam or pillows to be low passed around 300hz. Probably closed cell foam could work, but unfortunately I don't have one. I'm going to build bandpass enclosure for this driver (add another box with port) Can anyone recommend a good free bandpass calculating software? Overall this acoustic filter concept works very well, I've been using it in my car audio for several month. I think that a simple block of foam can greatly improve sound of any cheap speaker, when placed in front of the drivers.

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