Sealed box specs for Alpine SWR-1242D.

[SCOTT KOCH]

I agree with Joe x......build to 1.0 to 1.2 sealed and go with it.....I'm getting ready to do the same thing but with one type r......in a civic hatch...ohhh can't wait. Sealed is definitely better for deep solid bass!!

[logspace]

Thanks for the advice everyone. I think I will try sealed first, and if the sound isn't where I want it to be I will build a ported box like Joe said.

[Joe X]

Ok so here is a an example for a 1 cube enclosure that includes the driver displacement of the 1242D which is 0.071 cubes.

Enclosure Specifications:

Vb = 1 ft^3

External Height = 14 in

External Width = 17 in

External Depth = 11 in

Cut Sheet List:

* All Dimensions in Inches.

* Wood Thickness is 3/4 for all Parts.

External Enclosure Parts:

Front & Back = 17 x 14

Left & Right Sides = 9 1/2 x 12 1/2

Top & Bottom = 17 x 9 1/2

[logspace]

Thanks for the specs. I was also wondering if the shape of a sealed box affects the sound. For example, would a hatchback style box have any different sound qualities than a cubic or rectangular shape box?

[Joe X]

In cars the shape of the enclosure is really defined by the space you have available, if you have a choice avoid perfect cubes if you want to avoid coloration of sound, a rectangular box similar to the one I suggested will be easiest to build and give nice results. Slanted boxes are considered by some as better sounding but are much harder to build.

[logspace]

Ah ok. I was just visualizing sound waves and interference, then i got to thinking that some designs could potentialy cause standing waves. Thanks

[Joe X]

Right perfect cubes can develop strong SWs.