Here's some info about my 7 year old DIY sonosub.
Specs:
Cabinet: 214L, 20" sonotube
Tuning: 15.4 Hz
Driver: 15" Dayton DVC385-88 (http://www.parts-express.com/pe/showdetl.cfm?Partnumber=295-190)
Port: Precision Port 4" flared port
Binding Posts: Dayton Audio Gold Speaker Binding Post
Speaker Grill (for port hole): 10" 2-pc steel mesh speaker grill
Endcaps: 1.5" MDF - 1" inside, 0.5" outside
Endcap Finish: 2 coats of grey primer, 8 coats of black gloss spray paint, and 4 coats of clear lacquer - wet sanded with 600 grit between every two coats
I tuned it with a BFD.
It currently attached to my Panasonic 54" RPTV, but is scheduled to move downstairs to my soon to be finished dedicated Home Theatre.
The pics are very old, and I have no build pics.
The sub is 50.5" tall. Here it stands next to one of my PSB Century 600i main speakers.
The 4" flared Precision Port vents out of the top endcap. To cover the hole I routed a 0.5" circle and inserted the 10" steel mesh speaker grill for a flush look.
I decided to mount the endcap to a baseplate using a tripod configuration. The legs are made of 2" oak cut to 4.5" length.
I mounted three leg brackets to the endcap. I bought double threaded bolts at Home Depot which I screwed into the top of the leg and then into the leg bracket. Then I simply drilled three holes through the 0.75" base plate and bolted the base to the bottom of the legs with big lag bolts.
Its pretty solid!
I used these gold speaker binding posts. The rear post is only 1" long so I had to countersink the posts a little on each side of the 1.5" thick endcap.
I think I purchased all the parts at Parts Express at the time.
Specs:
Cabinet: 214L, 20" sonotube
Tuning: 15.4 Hz
Driver: 15" Dayton DVC385-88 (http://www.parts-express.com/pe/showdetl.cfm?Partnumber=295-190)
Port: Precision Port 4" flared port
Binding Posts: Dayton Audio Gold Speaker Binding Post
Speaker Grill (for port hole): 10" 2-pc steel mesh speaker grill
Endcaps: 1.5" MDF - 1" inside, 0.5" outside
Endcap Finish: 2 coats of grey primer, 8 coats of black gloss spray paint, and 4 coats of clear lacquer - wet sanded with 600 grit between every two coats
I tuned it with a BFD.
It currently attached to my Panasonic 54" RPTV, but is scheduled to move downstairs to my soon to be finished dedicated Home Theatre.
The pics are very old, and I have no build pics.
The sub is 50.5" tall. Here it stands next to one of my PSB Century 600i main speakers.

The 4" flared Precision Port vents out of the top endcap. To cover the hole I routed a 0.5" circle and inserted the 10" steel mesh speaker grill for a flush look.

I decided to mount the endcap to a baseplate using a tripod configuration. The legs are made of 2" oak cut to 4.5" length.
I mounted three leg brackets to the endcap. I bought double threaded bolts at Home Depot which I screwed into the top of the leg and then into the leg bracket. Then I simply drilled three holes through the 0.75" base plate and bolted the base to the bottom of the legs with big lag bolts.
Its pretty solid!

I used these gold speaker binding posts. The rear post is only 1" long so I had to countersink the posts a little on each side of the 1.5" thick endcap.

I think I purchased all the parts at Parts Express at the time.