Flex-companion Series compact sub-woofers have been developed to extend the low frequency response of Flex self- powered loudspeakers. These sub-woofers have a (-3 dB) low frequency power response which extends below 50Hz. This provides a solid foundation for high impact full-range music program. Flex Companion sub-woofers are powered by an internal 200W class D power amplifier. They use proprietary sub-woofer signal processing which is provided by the DSP in its associated Flex loudspeaker.