Quote Originally Posted by GM View Post
Greets!

You're welcome!

No, I missed the 'step' in the cutout.

Not really, just stick some thick enough felt or similar pads on the 'steps' to snug it up.

At 16+ ft^3, a couple of 10ths off either way isn't audible.

I guess not other than I don't see any provision for easy vent tuning. It's location is fine.

Yes, this is my insulation of choice same as Altec after the asbestos laced Celotex was outlawed. Many manufacturers, DIYers use polyfil and the material properties MJK uses in his software with lamb's wool being considered the Rolls Royce of speaker damping.

Then there's open cell foam now that they've learned how to keep it from dissolving over time. I've experimented with open cell sleeping pad since it's so cheap at the local Wal-Mart, K-Mart, Cloth World or similar 'big box' discount stores. No doubt there's other materials out there and seems to me I read something awhile back about 'green' ground up T-shirts or jeans or some-such, so with each of these having radically different damping coefficients, you would have to experiment to find the optimum amount.

Just don't use closed cell foam..........

GM
Thanks, I feel like I'm on the right path with the bracing, cabinet volume, and such.

The linked Pensil 12 cabinet literature states, "Adding this bracing can be as much work as the whole rest of the cabinet but really helps to get the last bit of performance..." and I can agree with work assessment, I just drilled 42 --9/16" holes in one brace and had to stop to let the drill cool off.

I will weigh my options on the type of stuffing to use. If I can source the 703 sheet fiberglass, that would probably be my first choice.

I don't mind recutting the vent to a larger size or adding vent length should that be necesary. I may want to do some cosmetic treatment to the outside of the cabinet so covering part of the vent, also, would not be that big of a deal.

I am thinking of building a frame to aid in the assembly of the cabinet. Maybe a square of 1 x 4 with slots cut in two pieces so that squareness can be adjusted and dimension changed to accomodate any discrepancies of the cut panels. I think I have all the dimensions correct....

Thanks, again for your time with this.