would this work?

[pa-pa-platypus]

what vehicle is this going into?

[jeffrm]

02 silverado ext cab. No back seat. the box is gonna come up at the bottom of back window. Box is gonna be on a "stand" that goes to the floor and covers my batteries

[Joe X]

Are these you EXTERNAL dimensions??

54W

21.5D

17.5H

If so here is a design suggestion for a box with a center divider and tuned to 36 Hz, sub displacement is assumed to be 0.23 cuft (same layout as yours):

Enclosure Specifications:

Fb = 36,067 Hz

Vb = 3,406 ft^3 (per chamber)

Subwoofer Mounting = Front Mounted

External Height = 17,5 in

External Width = 54 in

External Depth = 21,5 in

Port Width = 3 1/8 in (one port per chamber)

Cut List:

* All Dimensions in Inches.

* Wood Thickness is 3/4 for all Parts.

External Enclosure Parts:

Front & Back = 54 x 17 1/2

Left & Right Sides + Center Divider (3 parts) = 20 x 16

Top & Bottom = 54 x 20

L Ports Internal Assembly Parts (2 of each) :

Front to Back = 16 7/8 x 16

Extension = 1 1/2 x 16

Edited February 7, 2012 by Joe X

[bumpinTL364]

you could leave it as it was (without the splitter) but you would either have to move those back port walls back 5" so that you would have 5" from each side coming into 10" total (I think this would screw up your tuning though, and make the port way too small) OR the OTHER THING you would have to do would be double the center port to 20" wide (this should keep your tuning consistent. adding room for a splitter isn't necessary, just depends on preference)

Edited February 7, 2012 by bumpinTL364

[pa-pa-platypus]

sub up/ port up is what i could do for that vehicle.. and shrink your port down 7 inches and go from there.. (my computers being dumb at the moment or id post a torres screen shot) your port would be 16x7 as an L shaped port on the drivers side of the box ported ^ ive seen alot of people have success in that truck like that

[jeffrm]

The external dimensions used to be 57long x 25deep x 17.5tall . That would be as wide and deep as I could go but I had to shink the box that much to get internal cubes to work. I would actually like for it to be this big again. But that would be just over 12 cubes. Would this be possible to do with me needing 3 cubes per sub?oh and I forgot to mention that this box is for show and go, not competition. But if it could do good on the meter then thats good too.

Edited February 7, 2012 by jeffrm

[jeffrm]

ok this is what i come up with, port is 5in off back wall, shrunk the extention parts down 5in to compensate for the extra i had to go back. port is 16.75in long with 7in extentions off each side. comes out to be 2.68 cubes after displacement of subs.

[jeffrm]

these are the specs for box design from atomic for my subs

All displacements for port and driver already figured. All power measurements are for cone displacement, on sealed designs and port noise on ported designs.

QT15D- ported- 2.0ft3 4” port x 13 ½” long (36Hz) F3=50Hz 700w

2.5ft3 4” port x 9” long (36Hz) F3=46Hz 700w

3.0ft3 2(4” ports x 17 ¾” long) (36Hz) F3=43Hz 1000w

3.5ft3 2(4” ports x 16 ¼” long) (34Hz) F3=40Hz 1000w

4.5ft3 2(4” ports x 10 ¾” long) (34Hz) F3=37Hz 1000w

4.5ft3 4(4” ports x 6 ½” long) (55Hz) F3=45Hz 1000w (SPL)

parameters:

UNITS QT15D4

Revc (ohms) 1.80

Fo (Hz) 26.75

Sd (sqM) 0.089

Bl 10.50

SPLo (dB) 94.62

Xmax (mm) 8.75

Dvc (mm) 65

[jeffrm]

any designs with the space i have and these parameters i will consider. i dont understand what all that stuff means, im new to this.pictures of port design with dimensions will help alot.

Edited February 7, 2012 by jeffrm

[jeffrm]

i came up with this. if i dont get help by end of tomorrow im going ahead and doing this. and i need to know in one of the pics the bottom is white, is this what is the air space for subs, all the rest you see is port. basically 2 boxes in 1.