Velocity-18 Passive 18 Inch Pro Audio Subwoofer CabinetThis 18 Inch Pro Audio Subwoofer is constructed of all Birch Plywood and is a first run of a model that we were thinking of carrying. We had these built and actually made a design flaw in the ports. As you guys know, Ports are often placed in the front baffle, and may thus transmit unwanted midrange frequencies reflected from within the box. If undersized, a port may often generate "wind noise" or "chuffing" due to turbulence around the port openings at high air speeds. This is the problem we ran into with these subs. They sound awesome, except for a little "chuffing" that emits from around the ports. These 18 Inch Passive Subwoofer Cabinets deliver a deep low end and are rated at 500 Watts RMS and 1000 Watts Peak. They are wired at 8 ohms and have a Frequency Response of 35Hz - 200 Hz. The woofer in this cabinet has a 120 ounce magnet and a 4 inch Voice Coil. It doesn't matter if you are doing a DJ gig, a wedding, a church event, or a club gig, these subwoofers will deliver the deep bottom end you want! Great quality subs are very hard to find, especially at a decent price. The Seismic Audio brand was designed to make the professional musician, as well as the musician low on cash, sound great. With your purchase, you will receive a 18" Subwoofer Cabinet pictured and described above. So, put it in your cart today!