Port dimensions

[Joseph K 10+ year member]

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 //content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif

Thanks for any help!

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[Joseph K 10+ year member]

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 5,000+ posts]

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 10+ year member]

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 10+ year member]

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 10+ year member]

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[Joseph K 10+ year member]

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 10+ year member]

go to psp-inc.com and then click on the Port Length Calculator

 

[Joseph K 10+ year member]

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 10+ year member]

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 10+ year member]

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! //content.invisioncic.com/y282845/emoticons/cool.gif.3bcaf8f141236c00f8044d07150e34f7.gif