building first "tuned" box

[BobPencille 0]

ok im making my first attempt at a custom box. its for 1 sd12 in the trunk of a honda accord planing on sub facing back and ports facing up to go through the rear deck.

plywood (no mdf at local building store) 3/4 inch

depth 18"

w 20"

h 14"

port (1)

L 12"

dia.3

if my calculations are right

box is 2.21 ft3

tuned to 34.15

sub displacement is .10 so that should net me a 2.11ft3 box (damn i hate math)

am i anywhere close? or even headed in the right direction? any input would be great cause right now its in a cookie cutter Q-logic box (1.5 ported and its starving for air)

thanks guys and gals

Edited February 18, 2012 by dragula230

[mathewdylang 2]

You're wanting Aero port?

[mathewdylang 2]

Because if you're running a single round port 3in diameter 12in long you'll be at ~25hz and not have enough port area

[BobPencille 0]

just trying to get some more sound in the cabin moving air would be nice but like i said its only 1 12 on a alpine m-1000

as of right now just trying to get some basics down for when i step up to some zcons

till now its been slap some wood together and hope it sounds good

[BobPencille 0]

Because if you're running a single round port 3in diameter 12in long you'll be at ~25hz and not have enough port area

ok so much for the box tuning calculator app

[mathewdylang 2]

Are you wanting round or square port?

[DjCrush 0]

I came up with 25hz for your final tuning as well. That's pretty low, I wouldn't tune that low. If you can't get mdf can you get birch ply?

[DjCrush 0]

Because if you're running a single round port 3in diameter 12in long you'll be at ~25hz and not have enough port area

ok so much for the box tuning calculator app

Use torres

[mathewdylang 2]

Weird I used the btc app on my Droid and it gave me 25hz

[BobPencille 0]

if i remove the displasment in the calculator it comes up with 24.99 hz so changed some numbers

port 10" long

4" round

should be 35 hz

[mathewdylang 2]

36hz but only 12in of port area. You need about 24-30...

Otherwise you'd still choke it.

Edited February 18, 2012 by Mathew

[BobPencille 0]

if i go 19 long and 6 dia i get 28.27in2 but tuned to 41.73 is that to high for a daily driver listening to nine inch nails?

sorry for the noob questions just learning the proper way

[mathewdylang 2]

High thirty to low forty is good punchy bass like rock or country. But you'll drop off on lows. I'd aim for 38hz

[mathewdylang 2]

If you're on a computer use the Torres box calculator. You can figure port out if box tuning. If you run a 6in Aero 19in and put 6in externally you'll be around 39hz (just guessing roughly)

[BobPencille 0]

ok i think i got a handle on it if i use 24" of 6 inch 5 " external i get tuning of 38 with 28 in port area.

[mathewdylang 2]

1 problem, you have to have room between port and wall... roughly 6in. Do 10external tell me what you get. If its lower than 39 you'll be fine

[BobPencille 0]

ok the final size if i have it right are

w 32

h 17

depth 14

1 port 12" (3 external)

dia 6"

should be tuned to 36.59

but that increases my box volume to 3.73 ft3 will that be an issue cause sundown recommends (ported 2 ft3)

[mathewdylang 2]

do you have to have a circle port?? can you use a square port???

How much room do you have?

Edited February 18, 2012 by Mathew

[mathewdylang 2]

18x18x18

.1ft^3 sub displacement.

2 4in ports 16in long, 4in of the 16 external

38hz, 2.3ft^3 with 25in^2 of port.

[BobPencille 0]

thanks im using round ports cause its just a temp build (getting a different car soon) and wanted to try my hand at design and building (that didnt go well)

guess when i get my zcons ill pay for a design

due to space limits ill have to go 18x18x17high but it should work fine

[mathewdylang 2]

Hope it does man. You need help you can pm me