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The 234XL divider can select single channel triplex/experiential dichotomy. TRS balanced input and output; You can choose the ultra-low sound output of the headset or low frequency output of the left and right channel. Each channel has a 40Hz high filter (low frequency excision); Each channel is equipped with *10 range selection switch, power supply control and position change selection; The step - by - step potentiometer is used to make the adjustment more accurate. With a professionally calibrated 24dB/Oct,Lin, kwitz-r-iley filter.