Do the audio source, decoding, preamplifier, and postamplifier in the audio system need to be grounded at the same time? Or use the ground wire of only one device to ground all devices? Which grounding method has better anti-interference ability and purer sound?
Grounding at a single point and grounding all devices at the same time will make a difference in sound. Have you tried these two methods, and have you noticed the difference?