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The RB series is a two frequency full frequency speaker with high efficiency and superior performance. Adopting a dual frequency rear guide box design, a customized high pitched speaker unit made of imported top-level high pitched materials, combined with a customized low pitched speaker unit made of imported materials, can be used alone in applications without ultra-low frequencies to provide a full and low potential low-frequency effect, with distinct sound image positioning and resolution, making singing easy and the sound bottom clean. The tweeter unit adopts specially modulated speakers with adjustable horn, with a symmetrical design and a wide listening range. Regardless of the installation environment, it can ensure horizontal and vertical angle adjustment, making it convenient, simple, and easy to operate. Adopting NFD NURBEK FETA DIA illuminated logo, the sound is not only pleasant, but the logo can rotate 360 degrees for easy installation from different angles.