Lil help with 02 tahoe db drag build

[onetwobeat]

I have 2 18 inch X d4 sundown subs in a box that's 40.5×40.5×16.5 ID. it's a Lil over 14 cubic was told this weekend at at a compatetion that I needed to port the box my subs point up so port would have to be next to subs on top of box can any one tell me how big it needs to be tooned for 28 hrz Internet said 108 no hight width or depth can any one throw me a bone and tell me thank you .

[jarrius]

Do what?

[onetwobeat]

Lil over a 14 cubic inch box 2 18 inch sundown d4 subs need to no how big port should be I've look at a lot of different sites but never gives length width or depth can you help 1 site said 108 inch I've never did this first build thank you.

[onetwobeat]

Lil over a 14 cubic inch box 2 18 inch sundown d4 subs need to no how big port should be I've look at a lot of different sites but never gives length width or depth can you help 1 site said 108 inch I've never did this first build thank you.trying to get 28 hrz

[onetwobeat]

Lil over a 14 cubic inch box 2 18 inch sundown d4 subs need to no how big port should be I've look at a lot of different sites but never gives length width or depth can you help 1 site said 108 inch I've never did this first build thank you.trying to get 28 hrz

[onetwobeat]

I hate this phone sorry about extra posts

[jarrius]

We'll it depends on the tuning you want and a lot of other factors that I'm still learning.

But I will say this. From my math your box may be to small. I see 15.5cubes before sub and port displacement. Woofers and port problem will eat up a cube or 2. So let's say each sub is .5 displacement that it self will drop you down to 14 cubes then port displacement and bracing will make it let's say around 12-13cubes. Could be big enough I honestly don't know. But your box will be smaller then you think

[onetwobeat]

The paper work with subs say 5 to 7 in ported box just need to no how big to go width height and depth for 28 hrz