Features 6-1/2" Dual Cone140W Peak Power (40W RMS)Frequency Response 40Hz-20kHz90dB EfficiencyStrontium MagnetMounting Diameter 5", Depth 2-1/8"Water-resistant Marine DesignUV Resistant - Tested under ASTM G154High power handlingInsulated tinsel leadsSpecifications Frequency Response (Hz): 40-20,000Sensitivity 1W/1M (dB): 90Nominal Imp (Ohms): 4Mass (lb/oz): 1/7RMS Power (W): 40Max Power (W): 140Magnet Material: StrontiumMounting Diameter (inch): 5Diameter (inch): 6-1/2 Dual ConeMounting Depth (inch): 2-1/8Cone Material: Polypropylene