The er4s cable has a pvc insulator which is indeed quite microphonic. However, you more or less learn to live with it and don't notice it that much. Using the shirt clip helps a lot, and some people like to have the cord go over their ears, which just about gets rid of all microphonic sounds. I haven't found that ideal because the cord going over the ear is somewhat irritating because it falls off if you move around too much. However, to solve this, I took a piece of twisty tie (preferably black because it looks really stupid otherwise), about 4.5 inches long and twisted it together with the cord- maybe one twist per inch- with a small hook at both ends to attach it to the driver and cord respectively. I've found that this prevents the cord from falling off my ear because the twisty tie helps it keep the shape better.