Made of high-quality double-sided panels, simple and beautiful, with reasonable wiring, this module has a very high signal-to-noise ratio and good anti-interference ability. Voltage:AC 9V-12V Power: 10W dual power transformer Audio input: two-channel stereo input Audio output: Continuously adjustable subwoofer output Frequency division point: 59Hz -- 234Hz continuously adjustable PCB module size:89x83x28 mm This module is a subwoofer processing circuit with continuously adjustable crossover points, that is, a low-pass filter. The output end is connected to an ordinary pure power amplifier to form a subwoofer amplifier. The input can channel or two channels. channel stereo, very flexible and convenient to use, and a transformer with very small circuit power consumption is enough. Due to different batches, there may be differences in product appearance, color, and printed text, which not affect the use. Colour:Black Material:PCB Package Contents: 2 x Crossover Board 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.