The AKG K1000 is a headphone classic. Its truly open design has placed it in the annals of audiophile legend alongside some of the most iconic pieces of personal audio. In this episode, InnerFidelity interviews Heinz Renner, one of the original designers of the headphone and long-time engineer for both AKG and then Philips. Renner provides us with an in-depth look into history of the legendary K1000, and how he seeks to improve upon the original with his newest creation called the MySphere 3.