EMINENCE DELTA12B 12-Inch American Standard Series Speakers Kapton coil former Polyamide-imide coated aluminum voice coil Ferrite magnet Vented pole piece Pressed steel basket Paper cone Cloth accordion surround Power Handling (RMS) 400 Watts Power Handling (max) 800 Watts Impedance 16 ohms Frequency Response 54 to 5,000 Hz Sensitivity 98.3 dB 1W/1m Voice Coil Diameter 2.5" Magnet Weight 56 ounce