3.5мм аудиокабель для машины, защита от глючений и шумов

Connect headset to car MP3 and AUX of car navigation; no noise means ground issue. Connect mobile phone or MP3 (no power source) to car AUX, play music; no noise means ground issue. Use computer, power amplifier, stereo, CD with passive earphones to check for noise. After starting car, if power amplifier makes noise or varies with engine speed, use this product. If there is noise between power amplifier and speakers, install this product between them. When connecting laptop to projector and power amplifier, disconnect one to see if noise stops; then add this isolator to fix common ground noise. Cannot fix noise caused by non-ground issues like electromagnetic interference. Confirm the source before buying. Different users have different experiences with isolation. This product isolates noise caused by ground differences between devices. Common ground means different grounding points cause noise, like a humming sound in car audio that varies with engine speed. This product only fixes noise from shared ground, not other causes.