10′′ (25 cm) R-Series Subwoofers (4Ω + 4Ω) – R-W10D4 priced for 1x sub Alpine is proud to announce the introduction of the new R-Series Subwoofer line-up 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. 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.  General Features: •10″ Dual 4 ohm Type-R Subwoofer •Power Handling: ◦Peak: 2250watts ◦RMS: 750 watts •Recommended power range: 300 – 750W RMS •CTA-2031 compliant power ratings •Parabolic pulp/kevlar cone •H.A.M.R. surround •Polypropylene, mica and talc dust cap •Reinforced cone neck and spider joint •Cast aluminium frame with integral shorting sleeve •8AWG push terminals with VC configuration jumpers •2.6″ High excursion overhung voice coil •111 oz. Strontium ferrite segmented magnet •Top-mount depth: 5-7/8″ •Cut-out diameter: 9-1/16″ •Frequency Response: 26 – 200Hz •Sensitivity: 82.4dB •Resonance Frequency (Fs): 31Hz