Features: Professional 4inch 40W speakers features fiber diaphragm for enhanced bass responsiveness and dynamic performances in bookshelf speakers and music systems. Engineered with reinforced magnetic circuits and heat resistant voice coils, this durability driver delivers distortionfree sound reproduction even during extended highly power operate. Ideal for audiophiles and enthusiasts seeking premium sound components for customs bookshelf speakers builds or studio monitor upgrades. Perfectly complements home theater setups, gaming stations, or professional studio environments requiring accurate ranges vocal reproduction and deeply bass response. Acoustically optimized rubber surround and dust cap design minimizes resonance interferences, ensuring clear low frequency output for critical listening applications. Specifications: Component:Metal Size:Approx.105x105mm/4.13x4.13inch Drive voltages:12.6-12.65v Maximums power:40w Output sound pressure: 83±3dB Minimum resonance cycle: 65Hz±20% Option Type:Treble Horn,Woofer Horn, Package Includes: 1pc Woofer Horn note: Please allow 1-2cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.