EMINENCE DELTA15B 15-Inch American Standard Series Speakers Kapton coil former Polyamide-imide coated copper 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 64 to 4,000 Hz Sensitivity 100 dB 1W/1m Voice Coil Diameter 2.5" Magnet Weight 56 ounce