Box Calculator And sketchup

[MIKE-2U]

So i jsut downloaded torres box calculator and am still getting use to it. so say i have a single 15 in a box facing back with the slot port off to the left. the ports usually arent one piece. they have the piece (inside the box) that almost makes them an L shape or right angle. how do i include that on the calculator ?

when using sketch up and building a box how do i show the thick ness and end grains of each side i make in sketch up/ thanks

[Sergeant_Skyrim]

*trying to write up an explanation for you*

[Sergeant_Skyrim]

So i jsut downloaded torres box calculator and am still getting use to it. so say i have a single 15 in a box facing back with the slot port off to the left. the ports usually arent one piece. they have the piece (inside the box) that almost makes them an L shape or right angle. how do i include that on the calculator ?

when using sketch up and building a box how do i show the thick ness and end grains of each side i make in sketch up/ thanks

I noticed you ask that in the other thread and am still trying to figure out how to best explain it. I don't personally use sketchup since I was never taught how to (+ I tend to prefer pencil + paper). Don't know if you've heard of the 12-16 sq in per cubic foot rule (for slotted ports) or not, so there it is.

Basically when using the Torres calc and trying to put in the dimensions of the port, you are listing the internal dimensions. So if you're using 3 sides of the box as the port wall like you are trying to from what I understand, you put a 3 next to common port walls and then subtract 1.5 from height under box dimensions, list that as your port height, and then work on your width from there. Since you'll be doing 12-16 sq in per cu ft you want to multiply your desired net cubic feet by the 12-16 (so for the 15" sub we'll assume a 3.5 cu ft box) which would give you 42-56 sq in range for your port.

From here, we'll assume that since it's a box for a 15, the outer dimension of the box for the height is 18. Subtracting 1.5 from this (.75 thick wood) gives you 16.5H for the port height. Now divide your port area range by this number to find your width. Then you can calculate length for tuning from there.

God I hope this is right, it's late at night and I suck ass as explaining things to people

[MIKE-2U]

i think you got it right i will do a quick sketch up to try and help explain. my bad,

[MIKE-2U]

ok so the piece in red. how do you calculate that in the torres and yeah. thanks sorry for the confusion.

[99fullsizechevy]

I always do the L calculation my hand, say your box is 15 inches deep and your port needs to be 20 inches long. For this let's say port is three inches wide, your going to want to measure the center of the port to calculate how to do the L

Box is 15 inches - .75 for the back wall gives you 14.25 there to use, now since your port is 3 wide you have to have 3 inches from there to the other part of the L

Now to figure out the length of the L i take half the width of port and subtract it from the 14.25 which leaves 12.75 then 20-12.75 equals 7.25 which is the measurement from the center of the port in the corner to the end of the ports length so take 1.5 off 7.25 and you have the other have the L which is 5.75 then your other one is simply 3 inches away from the back..

End result 11.25 then turn and goes 5.75 more..

I'm on a phone hope that makes sense

[MIKE-2U]

yupp i think i get it thankyou

[99fullsizechevy]

Btw all this info is in other threads, I spent many hours reading to learn most off the ins and outs so I could to start designing boxes for me and all my friends

[Sergeant_Skyrim]

99fullsizechevy explains it best, I didn't know that's the part that you're confused about. But to sum up what he said, that's just the "Port length" in the calculator that extends further than the actual length of the box while keeping the port width the constant 3 inches wide.

[MIKE-2U]

and what if you do a square port like Meades ? then you put 0 for common walls i assume ?