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freebeard · 04-26-2015, 04:48 AM

I don't know the background behind this, but in the lower left is an illustration of 'passive porosity'.

I agree that perf metal might work well, but the acoustics could be problematic.

Edit: OK, Google knows about 'passive porosity:

https://archive.org/stream/nasa_tech...ge/n7/mode/2up

http://www.google.com/patents/US6616218

It even points back to where I found the chart:

http://ecomodder.com/forum/showthrea...tml#post391013

04-26-2015, 04:48 AM	#5 (permalink)
freebeard Master EcoModder Join Date: Aug 2012 Location: northwest of normal Posts: 28,779 Thanks: 8,176 Thanked 8,950 Times in 7,392 Posts	I don't know the background behind this, but in the lower left is an illustration of 'passive porosity'. I agree that perf metal might work well, but the acoustics could be problematic. Edit: OK, Google knows about 'passive porosity: https://archive.org/stream/nasa_tech...ge/n7/mode/2up http://www.google.com/patents/US6616218 It even points back to where I found the chart: http://ecomodder.com/forum/showthrea...tml#post391013 Last edited by freebeard; 04-26-2015 at 05:21 AM..