How to Fix Continuously Playing Car Audio?

[OPhoebe]

Here are the solutions for continuously playing car audio: 1. Turn the volume potentiometer to the lowest level. If there is a humming sound, it may be caused by the altered or insufficient capacity of the electrolytic capacitor in the amplifier's filter circuit. If there is a loud humming sound when the volume is increased, it is likely due to poor shielding of the amplifier's audio input. Check and fix the shielding issue. 2. Ensure that all component casings are properly grounded, and use shielded cables for audio input lines with good grounding. 3. If there is a hissing sound from the speakers, it is mostly due to poor overall shielding or inadequate isolation between the primary and secondary windings of the power transformer. Try reversing the power plug or connecting two 4700p capacitors with a working voltage of 250V in series at the power input, with the center tap grounded, to reduce noise.