I have heard of these before and they are just excellent. Little known tweaks to double their already impressive performance include soaking them in snake oil for 2 days at room temperature during a full moon, sprinkling them with magic pixie dust and then allowing them to break in for at least 120 hours. If you are fortunate enough to know any Druid priests, a blessing is purported to enhance them such that you can choose output of the audio in any language you prefer, except Klingon.