situation:

new box being designed for 2 12" RE SX, 4cuft, 33hz fairly basic.
subs fire up, port back
behind the back seat and in hatch compartment of a focus zx3.

current box design.
Free Ported Subwoofer Plans brought to you by SubwooferTools.com [insert slogan here]

issue:

the port will fire back and with the depth of the box, there will be roughly 1" of clearance from the back of the box to the "end" of the port.

My thinking is that the box/subs will see the hatch door as an extension of the port, and there fore change tuning, mess with sound etc.

any suggestions on how to fix this, i am intently listening.

also looking for a box designer that is a little more in depth than that tool..

 

Ideally the port should be aimed in the same direction as the subs, so perhaps move the port to that face if you have room.

What are you using for ports? Slot ports or regular pipe? Either way you can have bends in your port. The volume to surface area ratio is what is important for a port, so you can place a couple of bends in the port and performance won't be affected (however, any plumber will tell you the more turns a pipe makes, the more you will lose pressure at the other end) but one or 2 turns in your port won't be noticable.