Box design help.

[Cj Kumz]

Thats way better now lol. With that space you getting 8 cubes gross volume. You could get away with subs up port up. Aero ports would be best so you save even more on space.

[Nocturnus]

Yeah. What am I shooting for port area wise?

[Cj Kumz]

I personally don't like to go less than 48 in2 for a 15. So I think 96 in2 for both subs sounds ok to me.

[Joe X]

After all this, I really have 39:" across and not 33". No idea why I thought 33.

So now I got like 39 across, 17-10 tall and deepest i can go is ~27 on the bottom and 24 on the top.

What hatch, amplifier and and subwoofer models are you going to end up using?

[Nocturnus]

It's a Volvo V50.

Amp: Soundqubed Q1.2200d

Subs: DC Level 3 15s (still the plan).

Icould play with the port length to get the tuning freq a little lower.

[Joe X]

That truly is a thin port that you have there, JL Audio design directives recommend no more than 9:1 area ratio and you have a 15:1 !!, you will find that most slot ports (that is with common walls) are made 4:1 to 7:1, the lower the better. Or use round ports.

[Nocturnus]

Yeah, I am still playing around.

Question, I think the L3 15 says 3ft3 is suggested for ported. Is my net volume needing to be 6ft3 after displacement and port volume?

[Joe X]

Yes it would be 6 for two but for those subs work much better in larger boxes specially if wanting the lows, if you don't have the space go with other subs.