Features Hybrid Complex Polypropylene Cone Butyl Rubber Surround Heavy Gauge Steel Proprietary Stamped Basket 1” ( 25mm ) Voice coil/ Ferrite Oxide Magnet Tweeter- 1” ( 25mm ) Black Aluminum Dome Neodymium Magnet Specifications Dynamic Power Handling 225 Watts RMS Power Handling 75 Watts Frequency Response 30 Hz - 22 KHz Impedance 4Ω Sensitivity 90 dB Description Experience the Sound of Pure Euphoria with the ES7 57 Speakers!Elevate your auditory experience to new heights with the Euphoria ES7 5