Specifications: DMA-optimized, long linear excursion capability to virtually eliminate distortion and increase sound output Perform outstanding in compact sealed or ported enclosures DMA (Dynamic Motor Analysis) modeling to deliver unsurpassed dynamic stability and low-distortion operation within intended power range Mineral-filled polypropylene upper cone with a metallic JL Audio medallion logo gives the W3"s a whole new, classy and sophisticated look Vented Reinforcement Collar Insert Molded Suspension / Coil / Terminal Sub-Assembly Customizable Trim Ring Elevated Frame-Cooling Floating Cone Attach Method Surround Stress-Relief Free Air Resonance (Fs): 31.49 Hz Electrical "Q" (Qes): 0.523 Mechanical "Q" (Qms): 7.017 Total Speaker "Q" (Qts): 0.485 Equivalent Compliance (Vas): 1.138 cu. ft. / 32.23 liters One-Way, Linear Excursion (Xmax): 0.550 in. / 14.0 mm Reference Efficiency (no): 0.185% Efficiency (1W/1m): 84.87 dB SPL Effective Piston Area (Sd): 53.475 sq. in. / 0.0345 sq. m. DC Resistance (Re): 3.567 ohm Nominal Impedance (Znom): 8 ohm Thermal Power Handling (Pt): 300W Driver Displacement: 0.049 cu. ft. / 1.39 liters Net Weight: 12.25 lbs. / 5.56 kg Priced per speaker