MB Quart Reference subwoofer with dual 4 Ohm design delivers 2000 watts and features heavy gauge, powder-coated, aluminum die-cast basket. Terminal Type Push & insert style terminals for easy installation. Configuration Round Surround / Cone Coupling The pressure treated double stitched foam surround along with the dual poly cotton spider helps keep the piston motion of the subwoofer linear and distortion free. Voice Coil / Former Assembly Vented aluminum former holds a 3"" voice coil while allowing the heat to be exchanged. (Less heat means less distortion) Spider Specialized MB Quart dual poly cotton spider with double centering allows the woofer to handle more power with minimum distortions. Frame / Venting Heavy duty aluminum die-cast basket allows back venting, which exchanges heat with cool air, resulting in more power handling and increased reliability. Motor Vented high energy motor assembly with dual 70oz magnets increases power handling and increases SPL. Cone Non-Pressed Paper Cone with Coating Details & Specs Type Subwoofer Brand MB Quart Series Reference Category Mobile Condition New Color Black Warranty 1 Year Compatible Vehicles Universal Subwoofer Configuration Round Subwoofer Voice Coils 2 Subwoofer Impedance (ohms) 4 Subwoofer RMS Power Handling (watts) 1000 Subwoofer Peak Power Handling (watts) 2000 Subwoofer Cut-Out (in) 11.10 Subwoofer Mounting Depth (in) 7.32 Subwoofer Outside Diameter (in) 12.83 Subwoofer Sensitivity (1 watt/1 meter) 85.3dB Subwoofer Enclosure Recommendation Vented enclosure for spl or sound quality – See manual for recommendations Subwoofer Size (in) 12 Proposition 65 Notice WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov