Planet Audio PX12 Axis Series 12 Inch Car Audio Subwoofer - 1000 Watts Max Dual 4 Ohm Voice Coil Sold Individually For Truck Boxes and Enclosures Hook Up To Amplifier AXIS - 12 SINGLE Voice Coil (4 Ohm) 1000W Subwoofer. (Sold Single) Break Your Subwoofer In. Much like the engine of a new automobile a new subwoofer must go through a short but important process of “break-in” before it is run under harsh conditions. The “break-in” process will ensure the subwoofer is able to perform as it has been designed to. This process involves subjecting the subwoofer to no more than low-to-medium volume levels for a number of hours in the enclosure. 3-4 hours is generally sufficient for the subwoofer’s suspension to loosen enough to prevent the voice coil(s) from overheating and causing failure. The break-in period is also effective in extending subwoofer life. Over-driving the woofer before it has been properly broken-in will usually result in premature failure and poor performance.