critique my box numbers

[skylineTT 10+ year member]

alright this is for a 15" sub.. 3Kw RMS where the back seat used to be in a coupe. this is also using the RE calculator

width-40

height-18

depth-16

wood thickness-0.75

square port height-16.5

square port width-3

square port length (1)-12.25

square port length (2)-10

total port length-27

square port diameter-7.938851142

square port area-49.5

square port volume internal-1361.25

square port volume displaced-1377.375

box volume-4.533

tuned frequency-29.714252392092

im trying to go for 4 cubes at 30hz and i figure this monster of a sub takes about .5 cubes and would raise the tuning a tiny bit after sub displacement. are these good specs? thanks

Click to read more...

 

[RAM_Designs 5,000+ posts]

The sub won't take up .5ft^3, more like .2-.25ft^3 at the most for a single 15. But everything else looks close enough.

What sub?

 

[skylineTT 10+ year member]

its a sub ssackett made for me.. madmax 4" coil motor with his softparts and 15" basket.

 

[skylineTT 10+ year member]

well i drew the cuts on my MDF but it looks to be such a small box. i swear my 3 cube box for my L7 that i built with the old box calculator looked bigger. is the RE calculator accurate?

 

[Andrew12 10+ year member]

well i drew the cuts on my MDF but it looks to be such a small box. i swear my 3 cube box for my L7 that i built with the old box calculator looked bigger. is the RE calculator accurate?

Not at all bro

 

[skylineTT 10+ year member]

frick, what do i do?

 

[skylineTT 10+ year member]

ehh whatever i calculated volumes and at least its a true 4+ cubes without sub and port displacement. ill just do the dang thing and make my cuts and stuff today after i sleep.

 

[GAM3OVR 5,000+ posts]

my eclipse 18" 4hp titanium pro is only .255

Your 15" subs must have a magnet the size of my rims to yield .5 cubes of disp.

 

[mazdakid 5,000+ posts]

Not at all bro

Re calculator isn't that far off. Subract sub displacement by taking an inch or 2 off the box width and it should put you close to where you want to be.

 

[skylineTT 10+ year member]

cool. i made my cuts and i guess will finish today (thursday).. i still have a mess of wiring to do as well before this hoe is slammin.