The Alpine R-SB12V 12-inch enclosure is available as a single or “linked” format with an optional mounting bracket. This innovative design allows the sound consumer the option to easily add more bass to their system. Double the fun Alpine has been pumping out great sound for over 40 years, and now their Halo Series subwoofer enclosures make it easier to add more bass to your system. Dishing it out The R-SB12V comes loaded with Alpine's R-W12D4 subwoofer wired for 2-ohm impedance. The sub's Kevlar-reinforced cone and Santoprene surround give you solid bass response at power levels up to 750 watts RMS. The ported enclosure is tuned to 35 Hz to maximize performance. Optimized Performance The ported enclosure design delivers a higher total sound output for deep, powerful bass, reliable sound reproduction and overall great sound quality. The 10-inch enclosure is tuned to 36 Hz while the 12-inch enclosure is tuned to 35 Hz for optimized performance with Alpine’s S-and-R-Series subwoofers. Remote Bass Level Control Anywhere Bass levels can be controlled with the RUX-H01 Remote Bass Knob for Halo (sold separately). The knob can be mounted to any 9-inch or 11-inch Halo screen or anywhere in the vehicle for quick bass level adjustments. The RUX-H01 is compatible with Alpine amplifiers and is multi-amp capable (standard phone cable splitter required) and can adjust the gain from 0 to -12 dB. The bass knob is designed to match the aesthetic of the Halo displays and subwoofer enclosures. The smooth tapered edges and silver finish provide a premium look that compliments the Halo displays.