On some days, the sound produced by a Hi-Fi system offers moments of pure grace: our favourite artists are with us in the room, with all the atmosphere of a live concert. In such instances, the realism seems absolute. However, more often than not, there is something slightly artificial about Hi-Fi sound, even from a top-of-the-range system, that prevents us from really “connecting” to the music in question. For nearly 15 years, in my profession as a designer Hi-Fi equipment, I was confronted by phenomena that simply could not be explained by conventional technical knowledge. During this time, I tried to understand the physics of these phenomena, and conducted more than a thousand experiments. I saw Hi-Fi as a scientific anomaly, as a field in which there was a fundamental lack of understanding as to what determined the quality of the sound.