Strength and power Marine 8 is designed to survive almost anything, and its big 20cm mid/bass driver ensures a powerful, weighty sound. Easy installation A shallow 93mm mounting depth means Marine 8 fits almost anywhere. Specifications Description: 2-way system Drive Units: 1x Ø25mm (1 in) soft dome tweeter 1x Ø200mm (8 in) polypropylene cone bass/midrange Frequency range (-6dB): 36Hz – 26kHz Recommended Amplifier Power: 20W – 80W Sensitivity: 88dB (2.83V, 1m) Nominal Impedance: 8Ω (4Ω minimum) Outer diameter: Ø292mm (11.5 in) Cut-out diameter: Ø253mm (10 in) Depth behind surface: 93mm (3.7 in) Protrusion: 8mm (0.3 in) Neto weight: 1.7kg Pre-mount: Kit PMK C8 IP66 raiting Package Contents: Bowers & Wilkins Two-Way Speaker Marine 8, White, 2Pcs, Spiker wires, grille, Manual.