WEE Technology Company Limited - WEE are Capacitors Specialist'

In audio circuit, how to connect the positive and negative electrodes of the capacitor?
As output, the positive pole is connected to the output, and the negative pole is connected to the input. When the input is used, the negative pole is connected to the input and the positive pole is connected to the output.
For example, the two pins and one pin of the amplifier are connected to the positive pole of the capacitor, and the negative pole is connected to the input signal and output signal respectively

Audio Note Oil Filled Mylar Capacitor. The black line marking on the capacitor’s body means the negative or input side. We can see the noise is quite big if we put the positive probe on the side which has black line marking.
Lower noise if we put on the probe on the opposite way，that is the outer foil side 

Mundorf Supreme Capacitor doesn’t have marking, so you must measure one by one to confirm.For sure, lower noise if we place the probe on the opposite way.
For WEET Copper foil capacitors, we have two ways to identify the outer foil side . Firstly, we will make a marking when winding the copper and MKP on the core. Secondly, we can  mark a line or a special symbol on the surface of the marking. By doing these two process, we will show customers, a clear way to connect the positive and negative electrodes of the capacitor to gain the best music sound.

Below is the core of our WEET copper foil capacitors with marking identification.