Please check my design for a downfiring dayton 8"

[Lyerigolfin]

I'd like to know what people thought of this design.

The driver is the 8" dayton quatro SVC 4 ohm.

Dimensions (without stand)

Outer Height = 21.75"
Outer Width = 9.5"
Outer Length = 9.5"

Inner Height = 20.25"
Inner Width = 8"
Inner Length = 8"

.75 ft^3 internal with 13.9" total port length and 2.5" inner diameter (exactly to dayton's spec)

The legs are each 6" (this is what I'm mostly unsure about.) I don't know whether or not they will be real wood or PVC.

There's approx 3" of space between the driver magnet and the bottom of the port. I thought this was acceptable since it was more than the inner diameter of the port.

I'd line the walls with some acoustic dampening material just like dayton suggests.

I already did the driver sag calculation for the dayton quatro 8 and it was somewhere around 2% of xmax indicating that the driver is OK for this downfiring application.

Any comments are appreciated, thanks.

[IMGDEAD]http://portfolio.iu.edu/ajbush/sub_box_side.jpg[/IMGDEAD]
[IMGDEAD]http://portfolio.iu.edu/ajbush/sub_box_top_iso.jpg[/IMGDEAD]
[IMGDEAD]http://portfolio.iu.edu/ajbush/sub_box_bottom_iso.jpg[/IMGDEAD]
[IMGDEAD]http://portfolio.iu.edu/ajbush/sub_box_free_rotate.jpg[/IMGDEAD]

 

[Cal Weldon]

The drawings look very nice.

If you're worried about the port being too close to the driver you can experiment with stuffing the tube with a little damping when you are done. Listen first, fiddle later.

The legs might not have to be that long.

Cal

 

[simon5]

I built a downfiring subwoofer with a 12 inches driver, the plan I used had only 3.5" legs.

You can shorten these a bit.