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4-Way channel DSP digital preamplifier 1). Use advanced technology, music and voice have DSP effect, subsonic transfer intelligently. 2). 24 Bit high-speed DSP digital chip, 48KHz-sampling rate, inside gate, crossover and exciter. 3). 10 preset music module and 12 effects module, each of them could be adjust. 4). 9 stages equalizer, inside gate, auto gain control, alternate left and right channel. Subwoofer output. 5). 4-way sound channel and vision frequency auto input choose, stereo digital control. BGM background audio can switch automatically. S remote interface and infrared remote interface, parameter memory.