DS18 PRO-CF 6.4NR 6.5" Mid-Bass Loudspeaker With Water Resistant Carbon Fiber Cone And Neodymium Rings Magnet 500 Watts 4-Ohms Neodymium is known for being the best option for magnets in your speaker motors which give the loudest and most efficient speaker. SPECIFICATIONS Nominal Diameter 6.5" / 165mm Nominal Impedance 4 ohms RMS Power Handling 250W MAX Power Handling 500W Sensitivity (1w/1m) 95dB Frequency Response80Hz-12KHz Recommended HI Pass Crossover 100Hz Pair or Single Single Grill Included No MOTOR Voice Coil Diameter2" / 50mm Voice Coil Former Material Kapton Winding Material CCAW Cone Material WP Carbon Fiber Dust Cap Material WP Carbon Fiber Surround Material Rubber Basket Material Steel Basket Color/Finish Gloss Black Magnet Material Neodymium Rings Magnet Weight 0.28 Kg MEASUREMENT Overall Diameter 6.61" / 168mm Overall Depth 2.91" / 74mm Front Mount Baffle Cutout 5.75" / 146mm Mounting Depth 2.73" / 69.5 mm Motor Diameter 4.25" / 108mm