This is a junk item: BEHRINGER Behringer SUPER-X PRO CX2310. The main unit is in a fairly clean condition, with no noticeable scratches or stains, as shown in the photos. The following operations have been confirmed and can be used without any problems: - Power ON and confirmed to be energized. - Confirmed that stereo 2-channel and subwoofer audio input/output are working. - Confirmed that operation can be switched by operating each switch. - Confirmed that the sound quality changes with knob operation and there is no scratch noise. - Confirmed that the LEDs light up in each MODE state. ＜Reason for being a junk item＞ - When switching the "XOVER FREQ (×1/×10)" on the 1-channel side of the rear, a loud noise occurs during the switching. It can be used without any problems after switching. ＜Reference＞ Professional audio equipment with a high-precision stereo 2-way/mono 3-way crossover and subwoofer output. - Model name: SUPER-X PRO - Brand: behringer - Output model: CX2310 - Function: High-precision stereo 2-way/mono 3-way crossover - Connection terminals: Subwoofer output ＜Product contents＞ - BEHRINGER Behringer SUPER-X PRO CX2310 main unit - 1 power cable