The power supply should be 24V and the current should be above 3A. It is recommended to use a speaker with an impedance of 4-8 ohms and higher sensitivity. For sound sources with low signal levels, a preamplifier may be required for optimal performance. Avoid reversing the positive and negative connections to prevent damage to the circuit board. Ensure all connections are correct before powering on. Amplifier chip: TPA3116 Power supply voltage: 11-26VDC DC input with reverse polarity protection (recommended DC 24V, 3A or higher switching power supply) Output power: stereo 50W+50W, PBTL mono 100W Load impedance: 4-8 ohms (speaker impedance) Audio input: 2.54mm 3-pin header Product appearance and printed text may vary slightly between batches, which does not affect functionality Color: As shown Material: PCB + Plastic + Metal Package Contents: 1 x Digital amplifier board Note: The package includes only the items listed above. Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement error allowed is +/- 1-3cm.