Kicker Comp 12"

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Im building a box for a friend of mine For 2 of theese.

Kicker Comp 12" single 4 ohm coil..

I didnt check the website so i called kicker on theese subs.

They told me to build the box 2.1 cubic ft per sub.


They also told me to use a 30 square inch port 20 1/2" long..


Well the website says 3 cubic ft per sub ported but i already cut the wood and started putting a 4.2 cubic ft box together (2.1 per sub)


A 30" square port 20 1/2" long per woofer seems like to big of a port in my eyes maybe im wrong..

Wondering if anyone knows a good size port to use for theese subs??

I plan on making slot ports but wondering if the size they gave me is good to use or anyone have a better size port to use?

Any help would greatly be appericated
 
You should have asked kicker if the 2.1ft^3 was including or excluding the volume of the port. From some rough calculations, it looks like it's going to be tuned to about 44Hz which is a bit high for a daily driver. This is subtracting the 0.356ft^3 of the port from the 2.1ft^3 but it disregards the wall thickness of the port.
 
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