ACI used these drivers in their great Force/Force XL subwoofers. Here are the specs:
These are beasts hidden within a small elegant piano gloss black enclosure.
Cabinet measures 14"x14"x14" and has a 10" driver on the front and back, creating a dual opposed configuration. This setup has several benefits including incredibly deep and detailed bass from a small enclosure, as well as zero vibration.
It weighs 45 pounds.
This is a passive system and requires the addition of an amplifier. Combined with a subwoofer DSP, these are truly amazing and will hit 20Hz.
Please PM if you have any questions.
I'd prefer a local sale, but am open to shipping if buyer pays for packaging materials.