What Causes the Loud Hissing Noise When Converting a Car Amplifier for Home Use?

1 Answers
Carson
07/29/25 8:48pm
There are many reasons for the loud hissing noise when converting a car amplifier for home use. Reasons for the loud hissing noise: The input signal is not using shielded cables. Shielded cables are used, but the shielding layer is not grounded or grounded incorrectly. The grounding sequence of the added equipment is incorrect. The power connection sequence between the added equipment and the original equipment is incorrect. The power cable is too long without high-frequency filtering or shielding circuits. Random grounding: First, rule out the crossover. If the crossover is installed in the door panel, skip this step. If installed elsewhere, check if both left and right speakers have hissing noise. If only one side has it, the crossover is likely being interfered with. If both sides have it, consider whether the audio cable is being interfered with. To troubleshoot, if the hissing noise disappears, it indicates interference in a section of the audio cable. Re-routing the audio cable may solve the issue.
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