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By certification 
SC-1801X is a high quality 18 inch waterproof speaker. It is designed as a high end speaker to use in high class two way and three way speaker system. Strong carton fiber speaker cone can create a very clear sound.
Waterproof Speaker Feature
High quality carbon fiber cone
40hz-1.6khz frequency respone range
123oz Ceramic magnet
General Specifications
Nominal Diameter: 462 / 18 mm/inch
Rated Impedance:8 OHM
Sensitivity: 97 dB
Frequency Range: 40 Hz - 1600 Hz
Peak Power:800 W
RMS Power::1600 W
Voice Coil Diameter: 100/mm/ 4 inch
Voice Coil Material: Copper
Number of layers: Outside
Cone Material: Carbon Fiber
Surround Material: Polycotton
Surround Design: Triple – roll
Basket Materials:Alu
Magnet Materials: 123 oz Ceramic
Replacement Speaker T/S Parameters
Resonance Frequency: 40HZ
Qes: Electrical Quality Factor: 0.558
Qms: Mechancial Quality Factor: 7.385
Qts: Total Quality Factor: 0.519
Sd: Cone Area : 133.317cm²
Mms: Mechancial Mass :200.660g
BL Strength Factor: 22.140T.M.
