... low distortion loudspeaker technique, linear amplification technique, and DSP audio processing technique. Input signal is amplified by the ... -in pre-amplifier, then processed and distributed by DSP. Finally, output via power amplifier to the subwoofer ... all of which forms an integrated system.Model: RS-400 active mini line array, loudspeaker, pro sound, pa ... line array,pro loudspeaker,PA system (RS-400)