Alpine R-W12D4 12" Power Subwoofer ( 4+4 Ohoms )Alpine is proud to announce the introduction of the new R Series Subwoofer lineup that is built off the highly esteemed Type R platform. With select key design and build improvements, the R Series Subwoofer is able to output more of that deep bass extension and control that the Type R is known for. The Next Evolution of Proven Performance The new R Series subwoofers take a great platform to the next level. Although the R Series subwoofers are new for