What is the Best Subwoofer on the Market?

If you want the best I would go with the Quad voice coil Audiobahn Immortal series. The Audiobahn IMMORTAL Series subwoofers are designed for the competition environment. Their quad 2 ohm voice coils can handle up to 2250 watts rms and up to 4500 watts max. The Audiobahn IMMORTAL series subwoofers combine all of these advanced subwoofer qualities into an ultra-durable, cosmetically-appealing, chromed 3-dimensional die cast aluminum basket that adds an edgy appeal to any installation.