1.active mini line array,loudspeaker,pro sound,pa system 2.light weight,easy install 3.good ... technique. Input signal is amplified by the built-in pre-amplifier, then processed and distributed by DSP. Finally, output via ... Model: RS-400 active mini line array, loudspeaker, pro sound, pa system ComponentLF: (8"×2) x1pcMF/HF: (4”x2 +2 ... /set 4inch active mini line array,pro loudspeaker,PA system (RS-400)