... good and full strength.2. Strong and effcient output system with inverted-phase low frequency radiation.3. Voice-frequency ... multi-fuction hall.Technical Parameters Model KM-10 Picture System 2-Way Full Range Speaker Crossover Frequency 1.8KHz ... pairPictures with White & Black Color Speaker, Loudspeaker, Pro Audio, Audio System, Speaker Box, Speaker System, Line Array, DJ Equipment, Pa Speaker, ...