Factor Electronics Evolution Series indoor/outdoor speakers provide crystal clear audio quality and superior reliability. The IO-41 produces incredible sound quality for such a small speaker and is sure to impress even the most discerning listeners. Trust the Factor Electronics IO-41 for your next high quality installation. Features - 4 -Inch polypropylene woofer cone. - 12 oz ferrite woofer magnet. - 1 -Inch silk dome tweeter with neodymium magnet - High quality crossover with air core inductors - Aluminum non-rusting grille. - Heavy duty pivoting mounting arm. - Includes seismic safety cable. - Gold plated 12awg binding posts - 1 year warranty Specifications - Diameter Woofer 4? (101.6mm) polypropylene - Diameter Tweeter 1? (25.4mm) silk dome - Power Handling 100 watts (peak) 50 watts continuous RMS - Impedance 8 ohms - Dimensions Overall 9.5? (241.3mm) High x 6.25? (158.75mm) Wide - Depth 7? (177.8mm) Including mounting arm. - Frequency Response 110Hz - 22kHz (?±5dB) - Dispersion 95 ?° - Sensitivity 94dB Average - Grille Material Aluminum - Bracket Material powder coated steel