subwoofer passivo da esterno polk audio atrium100subOutdoor subwoofer with 10 inch woofer The 200 watt high performance subwoofer delivers bass that literally shakes the earth Robust 10 inch long throw Dynamic Balance driver technology eliminates speaker distortion for deeper, cleaner bass even at very loud volumes. Capacitive coupling technology and dual 2 inch voice coils reproduce bass for both stereo channels, producing increased low frequency level. Housed in a sound absorbing resin casing and