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skylineTT
03-17-2010, 12:41 AM
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

RAM_Designs
03-17-2010, 12:47 AM
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
03-17-2010, 12:53 AM
its a sub ssackett made for me.. madmax 4" coil motor with his softparts and 15" basket.

skylineTT
03-17-2010, 02:22 AM
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
03-17-2010, 02:23 AM
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
03-17-2010, 02:32 AM
frick, what do i do?

skylineTT
03-17-2010, 04:35 AM
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
03-17-2010, 06:37 AM
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
03-17-2010, 09:28 AM
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
03-18-2010, 04:34 AM
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.