Alpine Type-S SWS-10D4 10" Subwoofer. Peak Power Output: 1,500 watts. RMS Power Output: 500 Watts</br>Dual 4-Ohm Voice Coils. Built Like Type-R. Massive Voice Coils. High Strength Steel Frame</br>Concealed Mount Gasket System. High-Grade Strontium Ferrite Magnets. More Bass In Less Space</br>Alpine's Patented Airflow Management System Keep it Cool. 8 AWG Push Terminals. Kevlar Reinforced Pulp Cone</br>HAMRS Santoprene Rubber Surround. Frequency Response: 28-200 Hz. Sensitivity: 86.5 dB. Top-Mount Depth: 5-9/16"</br></br>Product Description</br></br>Features:</p> <p>Alpine Type-S SWS-10D4 10" Subwoofer <br> Peak Power Output: 1,500 watts<br> RMS Power Output: 500 Watts<br> Dual 4-Ohm Voice Coils<br> Built Like Type-R<br> Massive Voice Coils <br> High Strength Steel Frame<br> Concealed Mount Gasket System<br> High-Grade Strontium Ferrite Magnets<br> More Bass In Less Space<br> Alpine's Patented Airflow Management System Keep it Cool<br> 8 AWG Push Terminals<br> Kevlar Reinforced Pulp Cone<br> HAMRS Santoprene Rubber Surround<br> Frequency Response: 28-200 Hz<br> Sensitivity: 86.5 dB<br> Top-Mount Depth: 5-9/16"</br><br/>http://www.amazon.com/gp/product/B007YK0FFE