This one was put together at home during a vacation from work about 2 years ago. I used a Dayton PF-460 18" "pro sound" woofer in a 10 cubic foot (net) enclosure with twin down firing 4" ports and an integral 250W plate amp in the back panel, eq centered at 22 Hz (3dB) and subsonic filter at 18Hz nominal. The cabinet is constructed with laminated 3/4" plywood (1-1/2") and heavily braced internally. The cabinet was made to resemble an old console stereo cabinet. f3 is about 23 Hz. The driver has a rated sensitivity of 97db/1w/1m, so it is quite efficient. After 2 years of serious abuse, this thing keeps coming back for more. The system weighs in at nearly 250 lbs. It is crossed over at 80 Hz. The best part is that the whole system cost under $400 to put together and does a great job on music and HT.
http://www.hometheatershack.com/foru...1&d=1200361657