VTX Series G28 Ground-Stack Dual 18' Subwoofer featuring ultra long throw, patented Differential Drive® LF transducers configured in a pseudo-vented-bandpass alignment with inverted woofers (motors out) for improved cooling and reduced power compression. Large area, laminar-flow, low-turbulence central port. Includes: (2x) 2269H dual 4-inch voice coil, dual magnet 18' transducers; front NL4 connector for use when G28 enclosures are configured in rear-firing mode to create reverse-cardioid subwoofer arrays. Rectangular form factor for convenient ground stacking. Transportation and handling accessories supplied separately. Weight 92.5 kg (204 lb). Black