RCF S 10 Powered Speaker. The S 10 is a high power, small-footprint subwoofer system that is perfect for applications where a 10'' driver's impact and physical smallness are sought. This very effective design may produce output levels typically associated with much bigger enclosures by extending the frequency response of these systems to below 50Hz. a system appropriate for background music playback in settings including theatres, AV presentations, clubs, pubs, and cafes. A 10" woofer with a 2,5" voice coil serves 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.