Used item working in very good clean condition has some light marks in various places please view pictures The BSS FCS 966 Opal Constant Q Graphic Equaliser is a dual channel, 30-band equaliser designed for professional audio applications. This rack-mountable unit from BSS offers precise graphic equalisation for enhancing sound quality in musical instruments and DJ equipment setups. With two channels and a comprehensive 30-band EQ feature, this model is ideal for achieving a consistent and balanced sound output in various audio production environments.