Low carbon steel & bottom plates</br>Designed to optimize SPL performance</br>1.5" high roll foam surround</br>High excursion spider design</br>Dual 4?? voice coils</br></br>Product Description</br></br>Appreciate the difference a good subwoofer makes when it comes to music reproduction. The WDX 3K Series Competition Subwoofer (6.5 in.?? 600 Watts) from DB Drive exemplifies the company's commitment to big bass. Designed to optimize SPL performance?? this dual 4?? subwoofer boasts big power handling?? a ceramic ferrite magnet and a high excursion spider design.</br><br/>http://www.amazon.com/gp/product/B01HJ7XYFY