4th order bandpass-passive radiators - diyAudio
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Old 12th November 2012, 06:38 PM   #1
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Project closed

Last edited by slipfirep40; 21st October 2013 at 10:09 PM. Reason: Project closed
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Old 12th November 2012, 07:59 PM   #2
tb46 is offline tb46  United States
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Location: Texas
Hi slipfirep40,

I don't mess around a lot win WinISD, but I'll attach a quick entry using the LAB15 and an 18"Dia. duct. Under vent you find the duct length, and from that you can calculate the air mass, which is the moving mass of the respective (in this case 18"Dia.) passive radiator. You have to enter your components of choice into WinISD.....

For another approach you could model this in Hornresp, export the data to AkAbak, replace the "duct" with a passive radiator. This would also allow you to enter acoustic damping material and filters.

Attached Images
File Type: jpg Magnitude.jpg (61.0 KB, 121 views)
File Type: jpg Driver.jpg (25.1 KB, 119 views)
File Type: jpg Box.jpg (25.5 KB, 117 views)
File Type: jpg Vent.jpg (23.6 KB, 118 views)
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Old 13th November 2012, 01:15 AM   #3
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Thanks for the info.

16 bit Akabak told my 64 bit windows to pound sand.

Has anyone actually built a 4th order with/ passive radiator? I have found about a dozen threads where people discuss the possiblity, but not one of them ended with a build. So I guess I am treading on uncommon ground here?
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Old 13th November 2012, 11:51 AM   #4
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I know this is kind of putting the cart before the horse, but this is the form factor that I am shooting for:

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If these vifa drivers just won't work well in a Bandpass enclosure, what other 8" drivers will?
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