Conventional Speakers | Sound Cylinders | Walsh Series | View Cart | Check Out Item:  12'' Subwoofer with SBA / each   Item Number:  I-SW+  Price:  $175  This is the 12" subwoofer on the front of the cabinet. It comes with our new SubBass Activator (SBA). The SBA extends the deep bass, reduces the distortion, increases the maximum output and adds a self-resetting protection system.