Infinity Reference subwoofers deliver deep powerful bass that will take your system to the next level. Using our proprietary cone design and high roll surrounds, they are extremely efficient and require less power to deliver the goods. The Infinity REFERENCE subwoofers are also happy in both sealed and bandpass box configurations, delivering powerful, punchy and accurate bass in all. They also feature SSI™ (Selectable Smart Impedance), an exclusive impedance switch that lets you select the optimum impedance, 2 or 4 ohms for your chosen amplifier and overall system layout. SSI™ (Selectable Smart Impedance) Most car audio system designs call for 2- or 4-ohm impedance. Reference Series subwoofers feature an exclusive dual impedance switch that lets you choose either load impedance option depending on your particular system and amplifier choice. Not available from any other manufacturer, SSI lets you reconfigure your system by simply flipping a switch. Double Stack Magnet Design for Big Power Handling Reference subwoofers are equipped with double-stacked magnet, allowing the voice coil coupled with the high roll surround to travel over a longer excursion. Vented Basket Design for System Cooling Reference subwoofer vented basket keeps voice coil cool even at high output levels to ensure long term reliability. High-Roll Rubber Surrounds Reference subwoofers incorporate a high-roll surround that provides superior cone edge suspension while maximizing excursion. It not only increases the cone area, it also provides remarkable linear stability and reliability. Technical Specifications Subwoofer: 10" (250mm) Polypropylene Driver Power Handling: 350W RMS, 1050W peak Sensitivity (1W/1m): 83dB Frequency Response (-6dB): 35Hz – 500Hz Nominal Impedance: 2 or 4 ohms, switchselectable Voice Coil Diameter: 2" (50mm) Cutout Diameter: 9" (228.61mm) Mounting Depth: 5-1/16" (128.75mm) What’s in the box 1x 10" Subwoofer 1x EVA Foam Gasket 1x Owner’s Manual