Hang on to your socks; Focal-JMlab's new Sub Utopia Be subwoofer could quite possibly blow them right off your feet. This sub delivers a true 20 hertz with 120 decibels of sound pressure, the company reports. The 16-inch sandwich composite cone offers more than 10 times the rigidity of other materials, while the alloy basket supports a multi-ferrite magnet assembly that includes 18 magnets, measures 3 inches thick, and weighs more than 17.6 pounds. The Kapton voice coil is ventilated to limit the dynamic compression from the heat that the 1,000-watt BASH amplifier generates. For $6,000, this sub will rattle your bones.