Features 184oz Ceramic Ferrite Magnet Low Carbon Steel and Bottom Plates 1.5” Wide DFM Foam Blend Designed to Optimize SPL Performance High Excursion Spider Design Dual 4Ω Voice Coils Specifications Structure 15” (381mm) Max Power 4000 Watts Nominal Power 2000 Watts Impedance Dual 4Ω Voice Coil PARAMETERS Resonant Frequency (fs) 34.762Hz D.C. Voice Coil Resistance (Re) 3.2Ω + 3.2Ω Mechanical Quality Factor (Qms) 4.747 Electrical Quality Factor (Qes) 1.007 Total Quality Factor (Qts) 0.83 Equivale