Who wants to help me on box specs for 4 18" BTL's?

[Decaf]

use allthread for bracing and small 45s to keep volume up

[email protected]

[email protected]

just to give you an idea of where you should be... let me know how big you want to go, 8-8.5cuft max per sub but at least 7cuft min... as you go up in volume you likely can raise tuning a wee bit and save some space at the same time

but if you will be adding more power later you might want to stay closer to 7

[newls1]

Decaf...............I will be adding more power more then likely within 1-2 months after its all complete, so stay with 7cuft per driver, and HOLY SHIT THIS IS GOING TO BE A HUGE ASS BOX.....DAMN!!! Let me know what you think I should do, and how do I go about getting a cut sheet for this? Will that "PRINT" button using this program do something like that, or will it just print what I see on the screen? Fuck it, I dont know why I even asked, i'm going to go try it now. Thank you for all your assistance.

**EDIT** is the reason why you increased sub displacement is to compensate for internal bracing? I only ask cause I think the total displacement for the 4 18"s is 1.04

**2nd edit** The print feature doesnt work? weird.......

[newls1]

DECAF.............Scott from FI looked over the specs for the 7cuft version, and said that would be perfect for me and those BTL's....... Is there any way you can make me a cut sheet when you have the time? PLEASE!! I'll be your bestest friend in the whole world!

[Decaf]

add bracing displacement to the sub disp to get correct tuning and volume since currently u arent accounting for bracing, which im assuming will be alot

yup, add bracing to sub displ on that calc... once youve decided on what bracing you will use i can get a more accurate number

will you be using allthread, dowel rods, 2x2's...?

DECAF.............Scott from FI looked over the specs for the 7cuft version, and said that would be perfect for me and those BTL's....... Is there any way you can make me a cut sheet when you have the time? PLEASE!! I'll be your bestest friend in the whole world!

yeah if u are going with more power stick around 7, the fs is low enough u shouldnt miss much low end

and yes, ur box will be big but uve got a 14sqin/cuft port + bracing and 1cuft of sub alone... add 45s and u need a big box!

let me know what bracing ur using, how many baffles, and final desired tuning and i can finalize the sketchup w/cut sheet that makes the box a bit stronger and easier to put together, but harder to cut the pieces... so let me know

hell you could even do a slot port along the entire bottom of the box without getting port noise.... might gain some efficiency there too

port would be 46.5" X 9" if ud rather do that than the port u have designed now

[kirill007]

I see nobody clicked on the box that says: slot port.

If you click on it you can see that the tuning is lower then when you don't click on it.

[Decaf]

I see nobody clicked on the box that says: slot port.

If you click on it you can see that the tuning is lower then when you don't click on it.

its not a slot port yet, currently he wanted a rectangular port, originally 11*30

the only type of slot port he could do is along the bottom, which might be the best option

it increases bracing and allows you to include end correction factor so the box will be tuned a bit lower than the actual length

[newls1]

Decaf....... I will use some 2x4's for some bracing, and a bunch of all thread (1/2inch thread) that I have laying around. The 2x4's will go across the top of the box to give me some strength for the top boards (2 baffles) and some all thread going thru the box for strength as well. I must be real honest with you, I CANT CUT WOOD TO SAVE MY LIFE. So If we can keep the cuts as simple as possible the better! If that means staying with a regular port, then be it. I've never done a slot port, but just like everyone else, I want to loudest I can possible get. I will be fiberglassing the inside of the box too. I guess staying with 32Hz is good, do you think I should go lower? It's in your hands now Decaf....I trust ya! Thanks again for everything.

[Decaf]

can you add the 2nd baffle on top to save internal volume or does it need to be 24 or less no matter what?

this is where im at now

[newls1]

can you add the 2nd baffle on top to save internal volume or does it need to be 24 or less no matter what?

im not follwing you? What I think a baffle is, is just a second copy of the "top" board right? If so, Im just going to double up on the top board right?. I really dont want to go higher then 24 if I dont have to. 25 and up, the box will be in my rear view mirror. Not a big deal by any means, but I just hate the way it looks.

[newls1]

that looks great. Looks like a LOT of wood to cut, but i'll have fun.