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Joseph K
12-14-2008, 04:28 PM
Alright, I'm about to build a box for my 10" Fi BL (specs can be found here: https://ssl.perfora.net/www.ficaraudio.com/sess/utn;jsessionid=15494579c7c9332/shopdata/0050_Speakers/0020_BL/product_overview.shopscript). I have the box designed as far as dimensions go, but I need to know what size my Aero port tube needs to be cut to.

The box has 1.17 cu. ft. after sub displacement (port displacement hasn't been taken out yet). I need to know how long I need to cut my 3" flared aero port (http://www.parts-express.com/pe/showdetl.cfm?Partnumber=268-350) so that the box will be tuned to around 33 hz :confused:

Thanks for any help!

Joseph K
12-14-2008, 04:34 PM
Would 13.76 inches of length be correct for 33hz? I don't know if I did my numbers right, someone double check that for me...

IDSkoT
12-14-2008, 04:52 PM
Would 13.76 inches of length be correct for 33hz? I don't know if I did my numbers right, someone double check that for me...

For a round, I got 13.31... so I'd imagine 13.76 for flared would be a nice safe number.

Joseph K
12-14-2008, 05:30 PM
For a round, I got 13.31... so I'd imagine 13.76 for flared would be a nice safe number.

Alright, cool. Do I need to take into account port displacement before figuring the tuning or how does that work? Because I didn't figure the port displacement into the 1.17 cubes...

Joseph K
12-14-2008, 10:06 PM
Do I need to take into account port displacement before figuring the tuning or how does that work? Because I didn't figure the port displacement into the 1.17 cubes...

Bump

Joseph K
12-15-2008, 03:59 PM
...

Joseph K
12-16-2008, 09:26 PM
Do I need to take into account port displacement before figuring the tuning or how does that work? Because I didn't figure the port displacement into the 1.17 cubes...

Bump

skitzafit
12-16-2008, 09:29 PM
go to psp-inc.com and then click on the Port Length Calculator

Joseph K
12-17-2008, 12:00 AM
go to psp-inc.com and then click on the Port Length Calculator

That's what I used, but do I need to put the airspace of the box after subtracting port displacement or what?

gunz4me
12-17-2008, 12:02 AM
In Bass Box pro, 13.76" calculates out to 32.78 Hz with 1.17 cubic feet prior to port displacement. Your port displacement is a whopping 0.0661 cubic feet!

Joseph K
12-17-2008, 11:21 AM
In Bass Box pro, 13.76" calculates out to 32.78 Hz with 1.17 cubic feet prior to port displacement. Your port displacement is a whopping 0.0661 cubic feet!

Ok, cool. Thanks man! :cool: