You guys do realize that just cutting the port will make the internal volume bigger, right? The box is already over sized by over 2 cubes, and you guys are suggesting he make it bigger? Yeah, that makes sense...
OP, you need to fill up some of the volume in the box, or start over and build another. I'd build another, keeping the same port area, and tune to around 34hz or so.
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Ohio Bass Society
Team XS Power
2010 120-129.9 Bassrace World Champion