Compact 2.1 Channel Subwoofer Amplifier Board with Dual TPA3116 Chip, Treble and Bass Control, Bluetooth and AUX Inputs (ZK-TB21)

The ZK-TB21 is a 19V 4.74A power adapter that has received a 4.4 out of 5-star rating from 989 customers, with one 5-star review. Priced at $25.99, this power adapter features an AUX/Bluetooth input mode and is powered by a TPA3116D2 chip. The voltage output is DC19V 4.74A MAX, with a power output of 50W+50W+100W per channel. The plug style is 5.52.5mm, compatible with 5.52.1mm, and the working voltage is DC12-24V. The recommended speaker parameters are 20-100W (4-8Ω).

The ZK-TB21 Bluetooth Amplifier Board has an input voltage of DC 12V-24V and a max power output of 50W2 (R&L) + 100W (Subwoofer). The input method is Bluetooth & AUX, with a 2.1 CH Stereo Output and an output impedance of 4-8Ω. It features Bluetooth 5.0 and includes protection functions such as Reverse Connection Protection, Short Circuit Protection, Self-recovery Overheat Protection. The size of the board is 120100*22mm, and it weighs 195g.

The TPA3116 D2 is a Class D Power Amplifier IC launched by TI, with high-performance parameters. It can reach a modulation frequency of up to 1.2MHZ, and the high-power output distortion is less than 0.1%. The large 502510MM heat sink provides good heat dissipation for continuous high-power output, preventing the chip from overheating.

The ZK-TB21 offers multiple power input methods, including a high-grade fence terminal for convenient wiring that is not prone to short-circuiting. Two power input methods are available to suit different wiring needs.

It's important to note that sufficient audio input and power supply voltage/current are required to achieve the maximum power output. The higher the power supply voltage, the greater the output power, and the smaller the speaker impedance, the greater the output power. It is recommended to use a 4Ω speaker, and the power of the adapted power supply should be greater than the actual working power of the amplifier to ensure maximum output power.

The power switch on the board is a standby switch, and to completely turn off the power or unplug it for an extended period, you can unplug the DC plug. Properly increasing the voltage or reducing the speaker impedance can effectively increase the output power.

The package includes the ZK-TB21 Power Amplifier Board, a Protective Shell, a DC Plug, a Screwdriver, and 5 Knobs. The product comes with a 7 * 24 Hours After-sales Service, where the focus is on customer experience and satisfaction. If you have any questions or encounter quality issues, feel free to contact the company, and they will provide a 100% satisfactory answer.

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