The 4 silicon diodes next to the volume control is my way of cutting down on noise spikes.When my circulator pump turns on or off, there is a loud crack in the headphones.

• 在音量控制器边的四个硅二极管是我用来抑制杂声的一个办法，当循环泵打开和关闭的时候，耳机里总会发出大的杂声。