Feature●MTX Road Thunder RT8PT Universal Powered Vented/Ported Bass Tube. Peak Power: 240 Watts. RMS Power: 120 Watts. Subwoofer Size: Single 8"●Butyl rubber surround increases subwoofer durability. Vented design increases bass output. External Bass Control included in carton. Mounting straps included for secure installation●Built-In amplifier mounted on back of enclosure. Gain rotary knob adjustable from 100mV - 6V. Aviation grade carpet is durable and neutral color for use with all interiors●Crossover: Variable, 50Hz-200Hz, 12dB/Oct. Frequency Response: 50Hz - 200Hz. Dimensions. Length: 21.25" (53.98 cm). Height: 9.84" (24.99 cm). Depth: 9.84" (24.99 cm). Dimensions●Length: 21.25" (53.98 cm). Height: 9.84" (24.99 cm). Depth: 9.84" (24.99 cm).Description MTX Road Thunder RT8PT Universal Powered Vented/Ported Bass Tube. Peak Power: 240 Watts. RMS Power: 120 Watts. Subwoofer Size: Single 8"