Box Design Help ----- Silverado Quad Cab

[trulywickedcustoms]

ok so i just started 1 other small project my buddies truck he has a 1999 silverado.. its a crew or quad cab it only has the 3rd door... but ne ways he is wanting to keep his backseat we put a 3" lift on it so we can get a big box underneath it .... im putting 2 -12" jbl P series subs

http://manuals.harman.com/JBL/CAR/Boxes%20...4rev3_27_06.pdf ----- link to the box spec.

im am wondering if a vented box would sound good in there considering the box goes up and over the drive tunnel?? and if i could do the vent in the middle where it goes over and subs on each side facen your feet....

so my big ? is has any one seen or heard this... if so do you think a seald or vented would be better for his application??

sealed=1.00 cube

vented=1.75 cube

thanks guys ill get som specs and see if any one can help with the design

Edited August 13, 2008 by trulywickedcustoms

[trulywickedcustoms]

come on guys i need to be able to start his box sumtime next week any suggestions???

[quakecitystudio]

Okay I did a little reading on the sealed box and the woofer, and I think that there graphs is a little off. Why?

Look here: http://www.carstereo.com/help/Articles.cfm?id=29 and read on the Qtc. They say it's best to get a Qtc of .707, which is somewhat similar to how the music was originally recorded.

So I tried out this equation for a seald box based on your woofer and volume requirement:

http://www.carstereo.com/help/Articles.cfm?id=30

From this:

Qts .54

Vas 1.932ft cubed

Fs 27hz

Vb 1 ft cubed

And got this:

Qtc: .9246

Fc=46.23hz

F3= 37.77hz

Edited August 13, 2008 by quakecitystudio

[quakecitystudio]

In comparison I decided to try out the RE Audio RE Series 8" woofer:

Qts .34

Vas .957

Fs 22.8

Vb 1

and got this:

Qtc .4756

Fc 31.9hz

F3 53.18hz

Edited August 13, 2008 by quakecitystudio

[quakecitystudio]

I noticed my own flaw with Vas I was using liters and not ft cubed, and went back and corrected everything.

Are you wanting a sketch of the enclosure? What would your dimensions be? L W H Depth and the curve radius over the drive axle.

Edited August 13, 2008 by quakecitystudio

[trulywickedcustoms]

I noticed my own flaw with Vas I was using liters and not ft cubed, and went back and corrected everything.

Are you wanting a sketch of the enclosure? What would your dimensions be? L W H Depth and the curve radius over the drive axle.

thanks for helping im tryn to get him to email me the dem. b/c he wrks all week out of state.....

but ill get them asap and yeah i would like a roughd sketch with demen thrown in to help ... if thats not to much trouble...

thanks man

[trulywickedcustoms]

i think im kinda wanting somthing like this ... or sealed or with the boxes split with a port individually??

just sum thoughts

[trulywickedcustoms]

come on guys im supposed to start this build this weekend .. ill have demn 2night

do yall even think the idea is good?? and should i do seperate boxes or even sealed??

[JustinT]

looks good but you are definitely going to have to raise the seat up

[Ray]

It is an ext cab not a quad cab.

Do the port out the side both woofers on the opposite side.