Schematics for 15'' Top Firing, Rear Ported Enclosure

[Rzaa 10+ year member]

I've decided that I want to go top firing, rear-ported, 4.0 cubes @ 32hz. Max dimensions are 40"x30"x40". I didn't like the way subwoofertools was designing the port, so if anyone can help, it would be much appreciated.

 

[kicker06 10+ year member]

so you want sub back, port up?

I don't think that way is successful, unless your firing up through a rear deck into the car, in a trunk car.

What car again?

I can do a sketchup design for you.

Also, is that WidthxDepthxHeight?

 

[Rzaa 10+ year member]

Sorry for being unclear, but I want sub up, port back. The box is being installed in the back of my '03 Trailblazer. I went out and took exact measurements, and my max dimensions are 45''x37''x20.75'' (width x depth x height). If its at all possible, try to keep the height right at or around 20.75" so that the top of the box is flush with the top of my rear seats. I really appreciate all the help, let me know if you need to know anything else.

 

[kicker06 10+ year member]

Im doing it now.

Also, in the SUV's (some) of my friends, port and sub back was louder than sub up, port back. But it is a different design then the plain port back, sub back so it's really up to you.

Ill do the sub up, port back, but I can switch it easy if you want.

 

[kicker06 10+ year member]

Heres the size I came up with:

Width x Height x Depth

24.5" x 20.75" x 22.5"

Comes out to 4cu ft @ 32hz w/ 63sq" of port.

The port is 3.25" wide.

Good?

 

[kicker06 10+ year member]

Ok my sketchup is completly messed up.

I do not know whats going on.

I gotta figure it out.

 

[Rzaa 10+ year member]

Yea man, that sounds perfect to me. I really appreciate the help. If you can get the sketch up that would be great, but if not, don't worry about it.

 

[Rzaa 10+ year member]

I was messing around with skechup and I got:

If anyone could double check those dimensions, I would greatly appreciate it.

I have no clue what dimensions the green/red/blue parts should be. I knew you said the port is 3.5" wide with 63 in^3, but I did some searching and only found a thread that further confused me.

I'm planning to use a double baffle, so would I just add another layer of MDF to the top? If so this would give me:

 

[jdawg 5,000+ posts]

I've decided that I want to go top firing, rear-ported, 4.0 cubes @ 32hz. Max dimensions are 40"x30"x40". I didn't like the way subwoofertools was designing the port, so if anyone can help, it would be much appreciated.

play with the xmax setting, it controls the port width

 

[Rzaa 10+ year member]

I was messing around with skechup and I got:

If anyone could double check those dimensions, I would greatly appreciate it.

I have no clue what dimensions the green/red/blue parts should be. I knew you said the port is 3.5" wide with 63 in^3, but I did some searching and only found a thread that further confused me.

I'm planning to use a double baffle, so would I just add another layer of MDF to the top? If so this would give me:

Can anyone check those dimensions?