What's a Good port dimension

[Jglaser]

So I'm taking my sealed sub box and turning it ported for my 2 12" alpine type r's both having 1.53 cubic feet already put a 2" port in tuned to 38 hrtz but I'm getting this weird flapping sound from them it's not the subs so I suspect it's the ports would it benefit me and will it maybe fix the flapping sound if I bump the diameter to 3" and tune it to 32 hertz the sound is like there paper in front of the port but there isn't it is rather bothering me

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[Jeffdachef 5,000+ posts]

Scrap that sealed box. You dont have close to enough space to do ported after displacements. For two 12s you need at least at 6 inch aero port, not a round port, AERO port. If you want to use just normal round ports, you need an even bigger diameter.

free box plans

*OFFICIAL* Free Ported Box Plans (56k NO!!) - Dodge SRT Forum[/u][/b]

Use this program to design a box based on the space you have. Tutorials on using the caculator on the page along with download link.

Torres' Box Tuning Calculator - Updated 8/18 - Subwoofers / Enclosures - SMD Forum

Then plug the sub's parameters in this software and then plug the box specs in and see what kind of sound you will get, spl possibilities, port noise/rear air velocity you biggest problemetc...

LinearTeam

tutorial for WINISD






Use this program to design a box based on the space you have. Tutorials on using the caculator on the page along with download link.

Torres' Box Tuning Calculator - Updated 8/18 - Subwoofers / Enclosures - SMD Forum

 

[Jglaser]

What size diameter I have a very limited space I have 51" length but only 10 inches depth has to fit under my back seat of I were to keep my current box what size diameter port do I need