BLACKAIRP8-V6: BlackAir Wheel Well Triple 8 Inch Passive Radiator Subwoofer Enclosurer. Perfectly designed for today’s demand for high performance yet small footprint bass enclosures. Passive radiators enable the great bass response in a small enclosure with no port, with the advantages of no port non linearities and no high frequencies reflected out of a vent. Fully compatible with our plug and play micro amplifiers. Unique Design Passive Radiator technology. Unique mounting system allows fitment in most wheel wells to maximise space. Dual 4 Ohms Voice Coil Configuration. Steel mesh grilles protect the woofer and passive radiator from any potential damage. Spring loaded terminals allow heavy gauge cable to be connected. 8? Passive Subwoofer Enclosure. Peak power: 1200 watts. RMS power: 400 watts. Impedance: Dual 4 ohms. Dimensions: 18.8? X 19.9? X 5.9? (477 x 505 x 150mm). 2nd order passive radiator enclosure. Recommended amplifier: POWERBOX400.1M-V7.