Well I'm not real sure. I just know I had a set of creative earbuds that I plug into speakers and in 2 years it's never once shocked me. These new s4's seem to do it almost once a day. I do use em about 6-7hrs a day while I'm at work. I don't really hear an "electrify" sound lol.....i just feel a slight tingle like I'm being shocked. Primarily in the left ear. So who knows?