Peerless by Tymphany's SDF series are high-performance woofers designed for more bass in smaller-than-traditional enclosures. These drivers were designed with a 3" voice coil and a robust ferrite magnet system, which enables higher power-handling, enhanced low-end response, and more linearity. The newly designed aluminum frame is built for extra rigidity and heat dissipation with a vented paper cone for reduced air compression. These woofers are built for high-performance, high-excursion consumer and Hi-Fi applications.