Technical data Woofer 5,25″ Tweeter 13mm dome Impedance 4 Ohm Frequency response 68-21kHz Recommended amplifier 10-110W RMS Sensitivity 91dB 1m 2,83V Weight 2kg each UV-protected iP 54 rated ( Splash waterproof and dust protected ) Height 233mm Width 185mm Depth 165mm Depth with bracket 190mm.