18&rdquo; Woofer Speaker Replacement - 4500 Watts - 8 ohm - Woofer To Suit Your Professional Needs, For Home Theater, Car & More, By Audio Dynamics 4500 WATTS PEAK POWER : Audio Dynamics Earthquake Series Woofer provides a maximum power output of 4500 Watts to produce a powerhouse sound with bass you can feel! SENSITIVITY - 99 2dB : Audio Dynamics Earthquake Series Woofer offers state of the art performance that provides powerful sound with clarity and depth for a true to nature sound and a bass you can feel. IMPEDANCE - 8 ohms : Audio Dynamics Earthquake Series Woofer can handle significant amounts of amplified power without wearing out your speakers. FREQUENCY RESPONSE: Optimal for a variety of sound systems. Enjoy top notch sound that ensures an enjoyable listening experience free from interference, feedback or distortion! DURABLE DESIGN - Its all housed in a die cast aluminum basket for durability. Our heavy duty construction keeps your equipment safe and extends the life of the product.