Description: The recommended power supply is dual AC 12-18V, 10W. This product can not be directly connected to the speaker, need to connect amplifier to drive the subwoofer. Use the NE5532*2 architecture with integrated circuit sockets to change other architectures. This product has finished products and DIY kit to choose, the DIY kit need to be welded, assembled and adjusted by yourself to realize the function. There is a risk of damage in the production process. Specifications: Material: PCB+metal Color: as shown Types: DIY kit, finished product Board size: about 76x38mm Recommended voltage: dual AC 12-18V Frequency range: about 20-200Hz Package includes(optional): 1. 1 set of low pass filter board DIY kit 2. 1pc x low pass filter board (finished product) Note: 1. Due to the light difference, the item's color may be slightly different from the pictures. 2. Please allow slight deviation for the measurement data and make sure you do not mind before ordering.