This product is strong powerful bass, clear treble is not harsh. Use new original chip: Default woofer is 1pc TDA2050-- peak output of 32W, two-channel units 2pcs TDA2030-- peak output of 18W + 18W. Between TDA2030, TDA2050, LM1875 can be completely interchangeable, or if all replaced TDA2050 LM1875, please change larger heatsink. Amplifier chip has five pins: positive power and negative power, positive input, reverse input and output. Heatsink on the chip and the negative electrode is connected, energized work chip heatsink Do not short circuit and ground, otherwise the burn immediately. The figure is a schematic diagram of the wiring board, carefully control wiring.

The main parameters:
Left and right channels: TDA2030Ax2, peak power: 18Wx2, recommended 2.5-4 inch, 4Ω-8Ω 10-30W full-range speakers.
Bass output: TDA2050Ax1, peak power: 32W, recommended 5-8 inch, 4Ω-8Ω 30-50W woofer.
Power supply: double AC9-15V transformer recommended more than double AC12V 30W power transformer.
Output Power: DC12V1.5A, decoder board to 12V power supply.
PCB Materials: FR-4 fiberglass board thickness: 1.6mm.
PCB dimensions: 135x60mm.
Radiator Specifications: 100x33x37mm (length x width x height).
Center distance between the potentiometer shaft: 25mm, shaft diameter: 6MM.
PCB mounting hole spacing: 128mm (length) x38mm (width).
Net weight: 230g.

Package included:
1x Subwoofer Amplifier Board

• Use new original chip: Default woofer is 1pc TDA2050-- peak output of 32W, two-channel units 2pcs TDA2030-- peak output of 18W + 18W
• Power supply: AC double AC9-15V transformer recommended more than double AC12V 30W power transformer
• Left and right channels: TDA2030Ax2, peak power: 18Wx2, recommended 2.5-4 inch, 4Ω-8Ω 10-30W full-range speakers
• Bass output: TDA2050Ax1, peak power: 32W, recommended 5-8 inch, 4Ω-8Ω 30-50W woofer
• PCB dimensions: 135x60mm; Radiator Specifications: 100x33x37mm (length x width x height)

Use new original chip: Default woofer is 1pc TDA2050-- peak output of 32W, two-channel units 2pcs TDA2030-- peak output of 18W + 18WQianson-SFT