Port tuning Calculation help

[DDSC 10+ year member]

Hey guys, I am about to build a box and I wanted to make the port come through the armrest hole and I was wondering if the box was 3.5 or 4 cubes total and the port opening was 11.25"x8" how long would the port have to be to get 32hz the port will be using no side walls of the box

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[bigbud747 10+ year member]

I got 55" long. //content.invisioncic.com/y282845/emoticons/uhoh.gif.c07307dd22ee7e63e22fc8e9c614d1fd.gif Maybe someone could back me up on that.

I'm using this equaiton btw

 

[kush-divinity 10+ year member]

That's a huge port are for a 4 cube box, but **** will it slam. You hope. Since you ask about the armrest hole, I can imagine that a folded port will not work for you, so you may have to go with 2 6" aeros stacked or: a split turned port.

I have no sketchup but, make the port come into the box and then flip 90* and go behind the subs to get more length.

 

[DDSC 10+ year member]

ok I was thinking about using this plan now. Question is if I made the port opening 8"x8.25" which still works out to 66sq. inches I wouldnt have to change the port lenght would I

http://img339.imageshack.us/my.php?image=44cubes32hz66sqinrv7.png

 

[bigbud747 10+ year member]

Well, if you did a port that had 66 sq. in. of area, the port would be 39.5" long. In your original post, you had 90 sq. in. of port, making it 55.3" long.