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RB-10 is high efficient and high performance 10 inches 2-frequency loudspeaker, adopting back-wave tube design, equiped with imported customized high quality neodymium tweeters and woofers, suitable for individually application fields, ensure rich and strong low frequency effects, brightly acoustic position. Dedicated made tweeters with adjustable horn, symmetric design, wide diffion angle, convinient operation of vertical and horizontal adjustmentRB-12 is high efficient and high performance 12 inches 2-frequency loudspeaker, adopting back-wave tube design, equiped with imported customized high quality neodymium tweeters and woofers, suitable for individually application fields, ensure rich and strong low frequency effects, brightly acoustic position. Dedicated made tweeters with adjustable horn, symmetric design, wide diffion angle, convinient operation of vertical and horizontal adjustment