1. Do not use switching power supply, please use 12V ordinary DC power supply.
2. If the audio cable is connected to another audio device, disconnect it and connect it directly to the ordinary active speaker for the Walkman/PC. If the noise disappears and there is no problem with the high-fidelity pickup itself, check the connected audio equipment or other aspects.
3. Check if it is due to sound self-excitation. The speaker used must not be too close to the pickup, try not to test in the same room. Because of the high sensitivity of high -fidelity pickups , the feedback of the sound from the speakers to the microphones of the high-fidelity pickups will inevitably cause the sound to bleed spontaneously. Need for the same room, you can use Walkman headphones.
4. It is best to route the cables separately. Do not use the same cable tray with strong AC power, and try to keep away from strong electromagnetic interference devices such as transformers and luminaire rectifiers.
5. It is forbidden to connect high-fidelity pickups to the microphone (MIC) inputs of sound cards, mixers, amplifiers, etc., otherwise the equipment may be damaged. This is because high-fidelity microphones, although they also include microphones, but also include amplification, noise reduction, echo processing and other circuits, the output of 1Vpp above the "LineOut" audio signal.
6. Some video monitors have their own speakers, but they may not work well. Please use high-end headphones or active speakers.
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