enclosure for a 12" BL

[jgs07 0]

i need help choosing between these two designs for my 12" BL. my last box didnt turn out so well. so i was hoping you guys can maybe help me out a bit.

amp:hifonics bxi 1606d

goal:spl

first design:

H:14.25"

L:30.5"

W:18.25"

port width: 3"

total port length: 29.75

square port area: 38.25

box volume:2.9 cu ft (before double baffle)

tuned to:34hz

second design:

H:14.5"

L:30.5"

W:14.25"

port width:2.5"

total port length:31"

square port area:32.5"

box volume:2.18 cu ft (before double baffle)

tuned to 36hz

any input is appreciated, thanks.

[KU40 173]

what was wrong with your first box?

[jgs07 0]

what was wrong with your first box?

bl just didnt sound good, there was hardly any excursion and it wasnt loud at all. i think it was due to lack of port area.

[KU40 173]

Did it have a full 1000 watts going to it? What were the size and tuning frequency of that box?

[antonmiller 8]

here is the box that i am currently using. the tuning is actually 34 hz, even tho it says 32

and the 3.5 cuft is supposed to be 2.5, just a few typos. lol

Edited September 16, 2009 by Anton Miller

[KU40 173]

That box should have that sub moving plenty. Did turning the gain up not make a difference?

[jgs07 0]

Did it have a full 1000 watts going to it? What were the size and tuning frequency of that box?

it was somewhere around 2.5 cu ft tuned to 36hz. the thing about the box that i remember was that the backside of the L port was about 26-27 inches in length.i think that was the problem. in the end i wasn't pleased with the output, it moved very little air.

[jgs07 0]

when my car is running my voltage is at a steady 14.4v, so it should have had the full 1600 watts going to the sub. how do you post pictures on here? i found a pic of my old box saved on my computer but i dont know how to post it on here.

[jcarter1885 995]

when my car is running my voltage is at a steady 14.4v, so it should have had the full 1600 watts going to the sub. how do you post pictures on here? i found a pic of my old box saved on my computer but i dont know how to post it on here.

Open an account at photobucket.com or post them to your gallery under your profile section on this forum.

[antonmiller 8]

its gotta be the amp settings, maybe even the headunit settings....

[KU40 173]

does your head unit have a highpass crossover on it?

[jgs07 0]

specs of my old box.

14.00" h

14.50" D

35.00" W

Total inside volume BEFORE sub & port displacement = 3.15 cuft

Port dimensions = 3" X 12.5" x 36 (L PORT)

Port volume = 0.95 cuft

Sub displacemnt = 0.15

0.95 + 0.15 = 1.1 cuft.

2.0 + 1.1 cuft = 3.1 (within .05 is close enough)

tuned to 35hz

my headunit has a high pass filter which is off

my amp setting when i had this box in.

sub sonic-32 hz

low pass-80-90hz

bass eq-0

gain- set by dmm

[jgs07 0]

posted some pics of the sub box, they are in my gallery under my username.

[jgs07 0]

no one? i just need help from someone who's built boxes before to help me decide between the first two designs. my bl has been sitting at home for FOUR MONTHS without being played!!!!!!!

[forsellb 1]

no one? i just need help from someone who's built boxes before to help me decide between the first two designs. my bl has been sitting at home for FOUR MONTHS without being played!!!!!!!

Id say just build a box that matches Fi's site enclosure recc's..