Focal SUB10WM Utopia M Series 10" Sub Subwoofer 400w RMSUTOPIA 10WM SUBWOOFER COMPACTNESS AND DYNAMISM By introducing our M' profile 'W' cone to a subwoofer for the first time, our engineers were able to develop an unparalleled product, integrating, amongst other things, a 4. 7 (120mm) diameter double voice coil and a powerful neodymium motor. These innovations allow it to be integrated into a small sealed enclosure (10L minimum) whilst keeping exceptional dynamics and inimitable audiophile sound. Key