Enclosure Size Calculation

The version I'm using is the current one that is being downloaded, version 0.50a7 (11-09-2004).  The "auto calculate unknowns" check box is in Utilities, Database Editing, Driver Editor at the bottom of the box.  But what you have listed as the design is very similar to what I got and will work just fine.  Mine has 4.02 diameter as default, too, but I changed it to 4" even, and the port length changes because the volume is slightly different.  This is something you can play around with a little and each change will result in a slightly different looking graph output.  What I showed you has a flatter response than the one you came up with, mostly because of the extra air volume.  You could build it either way and be successful.  The port tuning can be either, so feel free to use what the program shows you.

Pe is RMS value of 175W.  The 575 is a meaningless number.

Alright

Ive come up with a box that measures (internally) D1=6" D2=10.8"  H=11.5"  & W=35.5".  The Vent is 4" x 8.1".  This will give a total volume of 1.986ft^3, with 0.1ft^3 taken into account for the volume of the driver, vent & wiring pot.  The tuning will be 39.96Hz.

Im gonna triple check my figures, then go get the supplies.  Exciting!

Ive massaged it a bit so that it will fill the trunk as I had hoped.  Im gonna place the sub on the left side of the box, & cover the whole thing with a 5/8" amp rack, which will make the sub fit flat, & will hide all the wires.  Should look pretty good.  Ill post pics of my progress.

Thanks for all the help!