Ray21

Sorry, I didn't realize you needed answers so quickly.... I was busy all day today w/work.

Sharing airspace is fine, IMO. I've done numerous multi-sub setups with shared airspace with no ill effects.

Regarding the port(s), you can't just cut the numbers in half and have it work the same. Proper port tuning is achieved by multiplying the port area by the port length. If you were to do two ports as you show in your diagram, they would need to both be 24" long in order to achieve the proper tune. The shorter port lengths would result in a higher port tuning frequency. There is not real benefit in having two ports as your diagram shows. One is fine as long as there is proper clearance for it.

Just to confirm, you built the box with the measurements I gave above? It's important to know since the airspace and port area/length are related.

SgtxTorque

Didnt mean to make it seem like I was rushing for an answer.

I couldn't see my post so I threw out another just to test it. I assumed the post didn't take.

I did not do the exact measurements you did for your box because I wanted them to downfire, so I took an inch down so I could add legs to the bottom.

https://www.f150forum.com/members/sg...asurements.png

These are the outside measurements in the Diagram above. I took the top board and "Kerfed" it to flow with the bottom of the seat. I used 3/4 MDF for everything. And I also tried to mimic where the subs sit in the box. The are not perfectly centered on the bottom board so there is space along the backside of the box.

Ray21

I see. On the top part of the box, where it makes a bend, how many inches from the back is it before it starts making the bend upward?

Need to calculate the exact airspace in order to figure out how long to make the port.

SgtxTorque

6.5"
But after all this, I may just redo the box and go straight across...
I may finish this box, then just make a replica of the box you made, but do it 48" long like yours...