Help with box design/blueprints....

[japjrthib]

Guys,

Looking for a little help designing a box for 3 sundown sa-12's. The specs call for 2 cubic feet per sub at 35 htz. Some say go lower on the tuning.... Input on this please? I listen to mostly hip hop/rap and I want these things pounding and low, making the hair on my head dance!

The stipulations I have is the box can be no longer than 49" wide and 18" tall. The depth doesn't matter.... Also they need to be all in separate chambers as I'm running 3 separate amps (3 JL 500/1's). I would prefer the ports be across the bottom of the box under the subs if possible with these size stipulations. The box will be for an 04 Avalanche. So once I have the box built I'm gonna be attaching it to a fabricated mid gate (just a piece of 3/4 mdf cut to make a wall and fill in the opening for the original Midgate). So the actual front board of the box will be that 3/4 mdf cut into a wall for the custom Midgate. This link will give a better idea of what I'm saying --

02-2009 Chevy Avalanche or Cadillac EXT. Jumbo Sub Box [AVAJUMBOPOLY] - $484.49 : CarJamz.com, Inc., Car Audio, Stereo, HID Conversion, Custom Boxes, Chrome Trim, Rims, Kinetik

I currently have them in a box I built but I didn't go off of the specs; it was just a box for a 12 I already had and replicated it to make 2 more chambers. I know I'm not getting the full potential out of these subs with the box they're in.

Any help is appreciated.

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[japjrthib]

Anyone have any input?

I'll pay for the advice and the design work....

 

[Buck 5,000+ posts]

Do 2 cubes per woofer tuned to 30-32 hz. Maybe 12-14 inches^2 per cube. Really straight forward.

You could also try a 6th order or a 4th order.

 

[The_Dealer]

This is me personally, and I've tried anywhere from 1.5-2.25cuft for an SA-12. I'd go 1.75-1.85cuft@33hz, and about 15.5sqin of Port per cube. No need for separate chambers, use a dmm to set them all at the same voltage. You'd have to be pretty far off before you'd notice an audible difference or any issues. I can't remember how the avalanche/ext is set up, what's your maximum depth you can go and I'll work on something.

Sent from my Motorola 2950 Special Edition 3w