I finished my first Cab for the Sub 1500, thought i would share a few pix.
Something Old: The granite top is 100 million years or so.
Something New: The speaker; the amp.
Something Borrowed: The expertise in this Forum and thanks a lot!
Something (almost JBL) Blue: Well the baffle is as close as I could come off the shelf in a spray can....
Details: This is a 3.1 cu ft internal volume box (not counting speaker displacement or bracing), with a baffle that is tilted back 10 degrees from vertical. Check a later post for my spiritual inspiration. Basic construction is 3/4 in. MDF, lock miter joints at all side corners, no mechanical fasteners except for hardware mounts. The box bottom is recessed up 1 inch from the lowest side point (to allow concealed casters) into a dado slot on all sides; the top is overlap rabbetted.
The side cheeks are 9ply 1/2 in. baltic birch, which I veneered with American Black Walnut. All sides are braced with same 3/4 MDF, inlet into dados, and an extra brace from L to R side across the middle of the cabinet. Sound absorbancy via R13 fiberglass all surfaces. It's very rigid and non-resonant. Finish is spray paint over primer on baffle and back, then high gloss nitrocellulose lacquer over natural Watco Danish Oil on the walnut.
The 2 cm granite top is large grain Baltic Brown, from a scrap I found for cheap at a local stone yard, which they cut and polished to my spec. The quartz inclusions give a bluish cast, very pretty in the right light. it complements the walnut well, I think.
The amp is a 250W no-name plate amp from Parts Express.
Overall dimensions, outside: 18.5 W, 23 H, 19 D (Top) 23 D (bottom).
Sound: Very deep, solid and controlled response, no really audible peaks or dips. I run this with the amp to max bandwidth, but crossed off the mains with an active Xover (behringer 3210) at 60 Hz. It sounds fine up to ~100 Hz, though.
It was a lot of fun to build, and i'll stay with the slant front for future subwoofer editions. This one goes in the family/media room. I still have to build a suite of three speakers and a media cabinet for the formal LR. Should keep me out of trouble for a while....
Adios,