Alpine R-W12D4 R-Series 12" Subwoofer With Dual 4-ohm Voice Coils Alpine is proud to announce the introduction of the new R-Series Subwoofer lineup that is built off the highly esteemed Type R platform 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 2017, they actually come from an impressive Alpine lineage – the Type-R subwoofers. Type-R subwoofers have been known for their power handling, clean output and deep bass excursion at a mid-line price. Using the highly successful Type-R subwoofers as a foundation, we applied various performance and hardware improvements to the design, essentially transforming them into the new R-Series subwoofers – The Next Evolution of Proven Performance. STRONGER CONE ASSEMBLY R-Series subwoofers feature a Kevlar-treated cone for durability. The combination of this cone with the Santoprene surround allows the subwoofer to deliver 19mm of X-max, for incredible, hard-hitting bass. A new method of attaching the spider and cone to the voice coil ensures not only rigidity throughout the motor structure but contributes to the subwoofers increased accuracy. NEW POWER RATING All four R-Series subwoofers are rated at 750W RMS. These subwoofers are a perfect match for the PDR-M65 Mono Power Density Amplifier, to create a system that works efficiently together. 12" subwoofer with dual 4-ohm voice coils Kevlar reinforced pulp cone with HAMR Santoprene rubber surround RMS 750W (375W per coil) Peak 2,250W Frequency range: 24-200 Hz Top-mount depth: 6-3/8" Grilles NOT included Warranty: 1 year