Building aero box today - Subs facing up or back?

[I Like Waffle]

Im building a box for 2 10s today, gonna be 3.5 tuned to 38hz. Im trying to make my final decisions on where the subs will be placed. Ive got a box planned out for subs back/port back but that requires me to use/waste almost a whole sheet of MDF, which i wanted to squeeze 2 boxes out of (this box and a small sealed 2 12" box) Heres a pic of my current design that i have planned out.


http://i44.tinypic.com/5cko50.jpg


Do you guys think i should do subs up ports back? Or should i keep this design? Going in a huge trunk car. Ive noticed from my tests that sealed or slot ported facing back is generally the loudest, and theres a little diff when i face them up. Im thinking of just sticking with this design unless theres a reason i shouldnt

[profundus-sanus]

thats a big box for a pair of 10's, especially common chamber.

none the less, subs back sounds good to me.

[Lakota]

Forward or back.

[thegreatestpenn]

all cars are different, but face them back toward the trunk lid.

[GregU]

all cars are different, but face them back toward the trunk lid.

x2

[I Like Waffle]

the subs call for 1.5 each ported, so i gave the gross volume 3.5 to account for port and sub displacement. You guys think i should make it smaller?

[I Like Waffle]

Just redesigned it. So now outta the 1 sheet of MDF im gonna get the ported 10 box to my measurements, and a 3 cube single 15" box. Gonna pick the wood/pvc up tommorow and build them then. :)