Phoenix Gold 300 Watt Underseat 8 20cm Active Amplified Car Sub Bass Box Subwoofer for Non Amplified LAND-ROVER Vehicles. The Z8150 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. 8 Compact Active Subwoofer. Ideally suited for expansion directly behind original radio or aftermarket radio. 8 closed flat 300 Watts subwoofer. Variable bass boost (0-18dB). Variable phase (0-180 degrees). Car remotely via Hi-level input. RCA low level input. H = 68 mm x W = 250 mm x L = 354 mm. Includes amp kit & bass controller. You can contact our. Our team is committed on dealing with enquiries quickly and efficiently.