“Historically, the term radiance stands for intensity and describes how light or heat for instance is emitted and capable to spread out, how it is reflected or how much of it gets absorbed by a surface. It’s about send and receive. When applied to sound, the listeners, their playback equipment and space, but also their openness towards a piece of music, will become this surface. They decide what’s happening, and what not.” “Radiance” is and has been a long time coming, in at least a couple of ways.