The C-FS104-BLK is a Free Standing custom sized 3/4 MDF cabinet with (1) 10" active subwoofer in the bottom of the tower, with a 3-way speaker on the top consisting of (1) 8" driver, (1) 6.5" neodymium mid driver, and (1) 1" beryllium dome tweeter. This unit requires both an amplifier for the 3-way speaker on top, and a sub-amplifier for the 10" subwoofer on the bottom.