It's All in Your Headphones with Tyll Hertsens editor-in-chief Tyll Hertsens discusses wireless headphones, including infrared, analog FM radio-frequency, digital Kleer FM, and Bluetooth; reproducing surround sound in headphones by simulation versus actual discrete drivers; the importance of correctly matching a headphone amp's output impedance to the headphones' input impedance, the best-sounding headphones he's heard lately, answers to chat-room questions, and more.

Run Time: 1:06:44

As the son of two ballet dancers, Tyll Hertsens has been exposed to music all his life. Fortunately for headphone listeners, his two left feet and a penchant for gadgetry kept him out of the theater. Tyll discovered headphone listening in high school with a pair of Koss Pro-4AA headphones and spent countless hours listening to Led Zeppelin, Pink Floyd, and the like. Later in life, as a scanning electron microscope repairman, he improved his listening with a DIY headphone amp with a crude crossfeed circuit.

In 1992, Tyll took his idea for a portable headphone amp to heart and started HeadRoom, introducing the world to the pleasures of well-amplified personal listening. HeadRoom went on to create the first commercially available portable headphone amplifier and the first balanced-drive headphone amp. Tyll also spent countless hours promoting the hobby of headphone listening, and today a thriving activity exists much to his credit.

After 17 years of operation, Tyll decided to leave HeadRoom and put his full attention on promoting headphone listening to a wider audience. To that end, he is not the editor of, a website dedicated to personal audio. The site focuses on headphones, headphone amplifiers, portable players, Internet radios, and all manner of personal audio devices.