Gently, lovingly used primarily for music. Built in 120 Watt RMS (265W peak) [It filled a 600 sq ft home theatre with great clean bass] Frequency Response 20Hz - 120Hz +/- 3 dB
User selectable crossover: 40Hz - 120Hz [so it pairs well with a variety of full range speakers or monitors] Weight 60 lbs (very well built)
These sold for $1,200 when new and produce some very deep, fast, clean bass. I was never able to make these clip (it has protective circuitry) even when playing the Matrix elevator explosion scene at full blast. Also it enhanced all kinds of music including classical. A great all around subwoofer.
Price is US$300 + shipping (These usually sell in this condition for over $350 online). The 12" woofer has a 10.5 lbs magnet structure. Size is (18"H X 16.5W X 15"D) and the weight is (~ 60 lbs) for shipping. It will be shipped from zip 11368 if you want to check with the shipping cost.
Here are some reviews of this item: http://www.audioreview.com/cat/speakers/subwoofers/velodyne-acoustics/fsx-12/prd_120765_2741crx.aspx
Here's the original manual: http://velodyneacoustics.com/pdf/fs/FSX-12Manual.pdf
Please look at pictures, the item has some slight scratches. I rated this Good and not Very Good because, when you turn the volume all the way up, their is a slight hum audible when not playing music. However, the hum is not audible when playing music or when volume is below that.