This crossover board refers to the commonly used resistance-capacitance crossover design, with simple structure and low cost. It is set as a stereo four-channel output structure. It inputs stereo left and right channel signals and outputs 4-channel signals, which are divided into left treble, left bass and right The treble and right bass can directly drive the 4-way power amplifier circuit. Board structure: Stereo four-channel output, left and right treble, left and right bass Op amp chip: The domestic high-precision NE5532 three op amps have chip sockets The power supply range of the AC transformer is dual 6V to dual 15V. It is recommended to use a dual power transformer 12V, and remember that the maximum value should not exceed dual 15. Colour:Photo Color Material:plastic Size:9.3 x 6.3cm Package Contents: 4 * Active Crossover Filter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.