This is a Bundle set that includes X2 Skar Audio EVL-65 D4 subwoofers. Skar Audio EVL-65 D4 subwoofers were designed to be the most responsive, powerful, and efficient 6. 5 inch subwoofer on the market. Don't be fooled by it's size, The EVL-65 is one Monster of a subwoofer, featuring a 2" Pure Copper voice coil, and a powerful 39 oz single slug ferrite motor. The small size of this driver allows it to be very versatile, and can be used in a variety of applications where adding a woofer might not otherwise be possible. Conservatively rated at 200 watts RMS power, and 400 watts Max power. Dual 4-ohm voice coil.