[mikeeastman]

Finally got the finish work on sub and stand done.

[bdp24]

A man after my own heart! Do you know how much more the lead weighs than an equivalent volume of sand?

[mikeeastman]

According to my calculation the lead is 4 time heavier, I also used 3/4" spacing instead of 1/2"

[rajesh]

I started my build and was searching for a similar build and found this thread and thought of piggybacking here.

Do we need to round off the edges of the braces like that? I'll do that if required but would skip if isn't.

Does one need stuffing in addition to No Rez on a sealed sub? I was thinkin' it wasn't necessary.

I asked Danny about using the Ultratouch with the poly, so I assume if the stuffing was unnecessary he would have said something.

How I wish Danny answered that question. Hope he would now. I have finished the inner box and the carpenter I've engaged for the work has other engagements for next couple of days.

Finally got the finish work on sub and stand done.

Are the bolts supplied along with the kit. I haven't got any with mine so need to source them from the market. Considering to buy SS ones.

[Danny Richie]

You don't have to round off the edges of the braces in the sub box.

And I do typically add a little light fiberglass or poly fill in the back of the box over the amp.

[rajesh]

I do typically add a little light fiberglass or poly fill in the back of the box over the amp.

Thank you very much for the clarification about the rounding of edges Danny. As for the damping, I was referring to the OP's covering of outer side of the inner box with some vinyl material.

Covered out side of inner box with vinyl sheeting left over from acoustical panel project and have most of spacers installed.

If it does improve things indeed, I can do that as well.

[Peter J]

Rajesh, mass loaded vinyl is used to sound proof rooms but hanging loosely behind drywall...typically with space between vinyl and drywall.

I'm no scientist, but I question it's effectiveness in this situation. I don't imagine it's a sound detriment, but it does introduce a structural element that I think is worth noting. By covering the box and then attaching the spacers on one has effectively limited the attachment of those spacers to mechanical fastening only, (nails, staples). Leave the MLV out and one can glue  and staple the "skeleton"  directly to box, a much stronger structural connection.

Seems to me there comes a point of diminishing or nonexistent returns when it comes to cabinet damping. What little this method does to improve damping would appear mitigated by the loss of structural strength. If I felt compelled to use it, I think I'd add strips of it between the skeleton members.

If it interests you here's my take on  the sandbox.

http://www.audiocircle.com/index.php?topic=84765.0

[rajesh]

Hi Peter, thank you very much for chipping in. It was really helpful. Much appreciated.