Earthquake's next generation of TremorX Subwoofers is ready to get louder and lower than any other Subwoofer in its category. The new TremorX's are built with TCT technology which allows the driver to play louder longer by keeping the Voice Coil running cool at all times. These Subwoofers also have stitched leads, reinforced dust cap construction for linear movement, and bigger, more effective magnets with added cooling devices to increase efficiency even more. The TremorX Subwoofers have no equal and are ready to prove it.