Critique wall plans(2 18 zv3 like subs)

[cam3888]

This is in a 1999 honda prelude so it consists of fiberglass/birch. Subs are zv3 motor/surround but with a softer suspension and longer coil. Power for now will be a sundown 3500 wired to .5 ohms

So far I have the floor an sidewalls in and the back piece fiberglassed on.

14.108 cb ft gross

after ports/subs

12.438 cb ft net

3 8" aero ports at 18" length 5 external(ends up being 5" from back wall)

tuned to 34 hz with 150.72" of port area(12.12 per cube)

I know being slightly closer than diameter of port makes tuning drop by a bit but by how much? A full hz or more?

I listen to almost exclusively decaf stuff/stuff I slow down (28-36 hz range), will 34hz tuning be fine for that or should I got lower? My highest tuned box before this wall has been 32 hz.

I can also make wall bigger by about 2-3 cubes but Im not sure that would be wise with these subs.

thanks for any input anyone can offer

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[raptor727 10+ year member]

Zv3's like smaller enclosures so 10-12 should be plenty. Decaf I usually tune around 32 and it pleases me. Its all really up to you zv3's are versatile subs so build away and test. Make the port adjustable and see what you like