Acoustic diodes in sealed enclosure

crazyhub · 6th February 2006, 09:39 PM

Hi all,

did somebody already build a closed enclosure equipped with acoustic diodes network?
The goal is to break the waves, reduce inner resonances and avoid the waves to return toward the cone of the driver without any stuffing or very less than usual

jmateus · 6th February 2006, 09:41 PM

Sorry, but what the heck is an acoustic diode?

ShinOBIWAN · 6th February 2006, 09:54 PM

Quote:

Originally posted by jmateus
Sorry, but what the heck is an acoustic diode?

Same thing as an electrical diiode; to allow something to only flow in one direction.

Its pretty obvious why this would be beneficial for the rear wave of a loudpspeaker.

crazyhub · 6th February 2006, 10:01 PM

jmatheus,
sorry but I'm not enough familiar with american/english, so, if your question is "what is an acoustic diode", it's a shape allowing to propagate the wave in one direction and avoid it to return to the source, quite the same work than an electrical diode.
The network of several diodes allows the waves to be breaked inside each by some rebounds on their walls, so dampening is get without stuffing.
If your question was not this one, please ask with other words than "what the heck is an acoustic diode?"
Thanks

Volenti · 6th February 2006, 11:36 PM

I'm not sure that I see much advantage here, while any structure inside the enclosure will provide damping to some degree, from the quick google reasearch I've done, acoustic diodes appear to be heavily focused on a narrow frequency band and not provide broard band damping like typical fill.

I feel that the effort in reasearching,testing and building these things would be better used in the overall enclosure design, or rather, avoiding the enclosure designs that would cause the problems that you would use acoustic diodes to fix.

pinkmouse · 7th February 2006, 12:00 AM

Crazyhub, could you describe exactly what you mean by acoustic diode, or give links please. Google turns up nothing of consequence.

roland bios · 7th February 2006, 06:00 AM

A picture says more than thousand.....

jmateus · 7th February 2006, 11:25 AM

Excuse my ignorance about the acoustic diodes but I've never
heard of such term. I've beeen an avid speaker builder in the past
and I was never aquainted with the subject.
And apparently I'm not alone......

However I'm open minded enough to learn something each
time I don't know, it would be good to have a sketch or pic
to ilustrate that principle.....

Thanks beforehand.

phase_accurate · 7th February 2006, 11:49 AM

If those consist of something that has differing flow resistance in two directions one has to take care not to increase nonlinear distortion.

Ch.L.

richie00boy · 7th February 2006, 11:58 AM

Is this not just a theory-perfect transmission line?

6th February 2006, 09:39 PM	#1
crazyhub diyAudio Member Join Date: Nov 2005 Location: alsace	Acoustic diodes in sealed enclosure Hi all, did somebody already build a closed enclosure equipped with acoustic diodes network? The goal is to break the waves, reduce inner resonances and avoid the waves to return toward the cone of the driver without any stuffing or very less than usual __________________ crazyhub

6th February 2006, 09:41 PM	#2
jmateus diyAudio Member Join Date: Mar 2003 Location: US, New Jersey	Sorry, but what the heck is an acoustic diode? __________________ JLH 2005, Cyrus and so on...

6th February 2006, 10:01 PM	#4
crazyhub diyAudio Member Join Date: Nov 2005 Location: alsace	jmatheus, sorry but I'm not enough familiar with american/english, so, if your question is "what is an acoustic diode", it's a shape allowing to propagate the wave in one direction and avoid it to return to the source, quite the same work than an electrical diode. The network of several diodes allows the waves to be breaked inside each by some rebounds on their walls, so dampening is get without stuffing. If your question was not this one, please ask with other words than "what the heck is an acoustic diode?" Thanks __________________ crazyhub

7th February 2006, 12:00 AM	#6
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	Crazyhub, could you describe exactly what you mean by acoustic diode, or give links please. Google turns up nothing of consequence. __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

7th February 2006, 11:25 AM	#8
jmateus diyAudio Member Join Date: Mar 2003 Location: US, New Jersey	Excuse my ignorance about the acoustic diodes but I've never heard of such term. I've beeen an avid speaker builder in the past and I was never aquainted with the subject. And apparently I'm not alone...... However I'm open minded enough to learn something each time I don't know, it would be good to have a sketch or pic to ilustrate that principle..... Thanks beforehand. __________________ JLH 2005, Cyrus and so on...


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6th February 2006, 11:36 PM	#5
Volenti diyAudio Member Join Date: Aug 2003 Location: Australia	I'm not sure that I see much advantage here, while any structure inside the enclosure will provide damping to some degree, from the quick google reasearch I've done, acoustic diodes appear to be heavily focused on a narrow frequency band and not provide broard band damping like typical fill. I feel that the effort in reasearching,testing and building these things would be better used in the overall enclosure design, or rather, avoiding the enclosure designs that would cause the problems that you would use acoustic diodes to fix.

7th February 2006, 06:00 AM	#7
roland bios diyAudio Member Join Date: Jul 2004 Location: Groningen	A picture says more than thousand.....

7th February 2006, 11:49 AM	#9
phase_accurate diyAudio Member Join Date: May 2002 Location: Switzerland	If those consist of something that has differing flow resistance in two directions one has to take care not to increase nonlinear distortion. Ch.L.

7th February 2006, 11:58 AM	#10
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	Is this not just a theory-perfect transmission line? __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

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