RCF S 12 Powered Speaker. The S 12 is a high power, small-footprint subwoofer system that is perfect for applications where a 12'' driver's impact and physical smallness are sought. With a frequency response that extends to sub 40Hz, these systems are capable of producing output levels typically associated with much bigger enclosures. a system appropriate for background music playback in settings including theatres, AV presentations, clubs, pubs, and cafes. There is a 12" woofer with a 2,5" voice coil as the low-frequency transducer. The woofer design produces a quick and precise reproduction of the bass frequency spectrum as a result of the most recent improvements in RCF experiences with tiny active and passive subwoofer design.