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Check the listing for details. HXJ8002 Power Amplifier Board Mini Audio Voice Amplifier Module Replace PAM8403. Condition: New. Listed at 1.37 USD. Onboard HXJ8002 single channel 3W, BTL bridge connection audio power amplifier chip. the output power (typical): 3W (load 3ω); 2.5W (load 4ω); 1.5W (load 8ω). the input signal is a frequency is 1kHz, 8ω loads; average output power is 1W condition.