These new Discus subwoofers from MB Quart are an all new design based on the popular RLP shallow subwoofer line. MB Quart Discus 600 Watt 10 inch shallow mount subwoofer with dual 4 ohm includes 2 inch voice coils, thermal formed poly cone, vented aluminum former and butyl surround. Less than 3 inches mounting depth. It is perfect for any truck or other application that requires a small mounting depth.