Product Information Features: RMS Power Handling: 90 Watts Peak Power Handling: 400 Watts Frequency Response: 40 Hz - 20 KHz Impedence: 4 Ohm Sensitivity: 91dB 1/2" (13mm) Aluminum Dome Tweeter Neodymium Magnet Rubber Surround 1" (25mm) Voice Coil Ferrite Oxide Magnet Mesh grills included Please click here for instruction manual (specs and mounting depth) and additional information.