Phoenix Gold ZB8P – 600 Watts 8′ Ultra Slim Compact Active Car Underseat Subwoofer – Comes complete with Bass Controller & Amp Kit. The Phoenix Gold ZB8P subwoofer is designed with maximum yield in a space at a competitive price. There are a few subwoofer boxes which are suitable for any application, for good additional layer to a heavy dual subwoofer box. Frequency response 20Hz -180Hz. Input sensitivity, high level 1.0V. Input sensitivity, low level 300mV. Low Pass Filter 50Hz-180Hz. Bass Boost 0 to+ 12dB. (L x W x H) mm 245 x 180 x 72 mm. Phoenix Gold Car Underseat Subwoofer. AMP KIT IS INCLUDED.