Searching for passive subwoofer...

I have 3 pairs but none are being made currently. The best is Nelson Reed 1204s. Uses 4 12" Volt drivers a side , 2 in front 2 in back of a 4 or 5 CF cabinet. Will do 120 db down to 20 Hz supposedly, I haven't ever driven it that hard but on the 1812 the cannon shots are something else. Kavi Alexander use to use them in his monitoring system at Water Lily, may still. The older Hsu woofers are also good, I have the 10" and 12" ones. Just a tube with a woofer in one end but worked well.

Decware offers DIY subwoofer cabinet plans/kits. You may want to contact them to see if any of these work for you. If you find something that works, Meniscus Audio is one (I'm pretty sure there are others out there) company that will supply drivers/materials and build from your plans. Never heard these products, so I can't speak to the results - just FYI.

Good Luck

Marty

VMPS is the only one I know of.

BTW, the giant Dec Imperial Horn design might seem expensive for a DIY kit at > $1K, but it is pictured (see their web site) with a naked lady reclining inside the cabinet. If she is included at that price, it's probably a good value.

Marty

PS The more realistically sized models are also more realistically priced.