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The SA series of active amplifier module, designed for active systems, using Class D circuit, modularized design, independent PWM fixed frequency modulation, to reduce the difference frequency of the self-excited circuit and multichannel interference. Built-in two channel 24 bit / 96 k sampling frequency of the high performance DSP processor, RS485 connector or network adjustment, input 31 section PEQ, output 10 section PEQ, input/output delay 0 to 25 ms is adjustable, and bringing the independent band-pass filter, all-pass filter, independent pressure limit, the noise control. The product has large power and low distortion, and the whole shielding sealing box makes the product meet the requirements of EMC and product safety level.