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Note: (1) This subwoofer amplifier board is a true pure bass amplifier, with only strong bass output. Note: Do not buy as a so-called (2.1) multimedia amplifier! thanks. Features: This is an upgraded subwoofer amplifier board version. Many buyers suggested that we produce high quality subwoofer amplifier boards designed for home theater, so this is it. 1. The power supply adopts high-efficiency half-bridge power supply, (110) 120V and (220) 230V transfer switches are suitable for global use, the power supply margin is quite large, and the ripple is lower than the traditional transformer power supply. 2. The power amplifier output also adopts MOS high-current tube output to achieve 200W (4Ohms-8Ohms) true 1% distortion, and the control is amazing. 3. The front desk adopts the current high technology of the subwoofer industry, adopts dynamic EQ algorithm, high speed, low dive and high control. The low cut is also designed to drop all frequencies below 20Hz and convert the energy into the 25Hz-60Hz frequency range, making it sound endless and full of energy. 5.In addition, this power amplifier board is also equipped with reverse phase subwoofer and closed subwoofer switch, so that each subwoofer can achieve good results. The materials are sturdy, with an aluminum backplate and almost no bottom noise. It is a rare subwoofer power amplifier board in home theater. Product parameters: Rated power: 200W Maximum power: 300W Input voltage: 120-240VAC Suitable impedance: 4-8Ω Suitable for speakers: 8-12 inches aperture size Minimum aperture size: 21.5×17.5×5.2cm/(8.465×6.89×2.047 inch) Maximum aperture size: 23.5×18.5cm/(9.252×7.283 inch) Rated output power 350W, please click the link below https://zanbbel.com/img/FUGdweBeys-e2NQrHTk1QRx4rLj1Fn8DIo14bdoYlzZsmE0Sjr3mY-Ys8y5QKOg7ETKggRBJIb1OG4SVL5EF6UGAzzx0PI74F-i0u5kQZP1q.jpg?w=800 Shipping list: ●Subwoofer amplifier board (metal panel) × 1 ●Speaker cable 53cm×1 ●Mounting screws×11 ●Power cord (optional, if you have a power cord, please select "Without power cable")