Stuffing material obstructing airflow query:

tktran · 5th July 2005, 07:06 AM

Hello all,

I've lined a speaker box with deadening material and about to apply dampening material. I'm using 200gsm Dacron. I've had good results with this in my first speaker, and decided to use it again.

My baffle is 1" thick but rather narrow (external width: 7.5"). The inside of the baffle is too narrow to chamfer with my router.

Does anyone have experience with applying dampening material in this situation? Does Dacron impede airflow? Initially I had planned to line all panels. Perhaps I keep the SIDE panels near this area totally clear?

Here's a picture of the situation:
http://kram0.com/gallery/main.php?g2...geViewsIndex=1

thanks,
Thanh

Volenti · 5th July 2005, 09:34 AM

Of course dacron impeeds airflow, that's it's purpose.

But it won't be harmfull in your suituation unless it's physically rubbing on the woofer's cone.

Duo · 5th July 2005, 10:06 AM

Yes, to my knowleadge the point of damping material is to place an impedance in the way of the air flow in the box to prevent sympathetic reverberations and the such.

phase_accurate · 5th July 2005, 10:20 AM

There is no simple and distinct answer to that question.

Stuffing material that is too close to a driver's backside can move with the airflow and will do this in a nonlinear fashion sometimes which will in turn lead to nonlinearities in the driver's behaviour.

So it is best to TRY it out.

Regards

Charles

dnsey · 5th July 2005, 11:01 AM

Why not do things the 'old fashioned' way, and enclose the rear of the driver in a loose-weave bag?

soongsc · 5th July 2005, 12:55 PM

Quote:

Originally posted by dnsey
Why not do things the 'old fashioned' way, and enclose the rear of the driver in a loose-weave bag?

That sounds like a neat way of damping drivers. Is this used quite often?

AudioFreak · 5th July 2005, 01:53 PM

Quote:

Originally posted by soongsc

That sounds like a neat way of damping drivers. Is this used quite often?

I believe the point of this is not to damp anything but rather to keep the stuffing away from the driver.

tktran · 5th July 2005, 04:45 PM

Hello,

Thank you everybody.

I think my question was a bit convoluted, but after much consideration of all replices, I decided to do it this way:

regards,
Thanh.

5th July 2005, 07:06 AM	#1
tktran Account Disabled Join Date: Mar 2003 Location: Perth	Stuffing material obstructing airflow query: Hello all, I've lined a speaker box with deadening material and about to apply dampening material. I'm using 200gsm Dacron. I've had good results with this in my first speaker, and decided to use it again. My baffle is 1" thick but rather narrow (external width: 7.5"). The inside of the baffle is too narrow to chamfer with my router. Does anyone have experience with applying dampening material in this situation? Does Dacron impede airflow? Initially I had planned to line all panels. Perhaps I keep the SIDE panels near this area totally clear? Here's a picture of the situation: http://kram0.com/gallery/main.php?g2...geViewsIndex=1 thanks, Thanh

5th July 2005, 10:06 AM	#3
Duo diyAudio Member Join Date: Jun 2002 Location: Victoria, BC, Canada	Yes, to my knowleadge the point of damping material is to place an impedance in the way of the air flow in the box to prevent sympathetic reverberations and the such. __________________ -- Duo, W1ngs, VA7MON, and lesser known handles. -- -- http://www.w1ngselectronics.com -- My Work and Projects --

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5th July 2005, 09:34 AM	#2
Volenti diyAudio Member Join Date: Aug 2003 Location: Australia	Of course dacron impeeds airflow, that's it's purpose. But it won't be harmfull in your suituation unless it's physically rubbing on the woofer's cone.

5th July 2005, 10:20 AM	#4
phase_accurate diyAudio Member Join Date: May 2002 Location: Switzerland	There is no simple and distinct answer to that question. Stuffing material that is too close to a driver's backside can move with the airflow and will do this in a nonlinear fashion sometimes which will in turn lead to nonlinearities in the driver's behaviour. So it is best to TRY it out. Regards Charles

5th July 2005, 11:01 AM	#5
dnsey diyAudio Member Join Date: Mar 2004 Location: Shropshire, England	Why not do things the 'old fashioned' way, and enclose the rear of the driver in a loose-weave bag?