This is a new "old-stock" Velodyne Acoustics Servo F1500-R 15" Powered Subwoofer. It has never been used, and it has the original box, instruction manual, and remote control. This subwoofer uses micro computer controlled servo accelerometer to correct distortions in real time, so it reproduces rock solid, clean, undistorted bass effortlessly down to 18Hz (-3dB). There are many reviews online, so you can check out what the audiophile experts say if you are not familiar with the Velodyne Servo series subwoofers. The original price for this sub was $1600. Please note that this is a very large unit, 20" x 20" x 20" (and weighs 90 pounds), so make sure you have enough room to put it.