LeRusllanDon't have the m6 at the moment. Love the m3p. I use different tips if I work out or just relax. After the burn it it has a really equal sound.
LeRusllanWell, that's the general idea of burning in the headphones. Some say that you should let them play some static, others prefer some soft music. Others just don't care at all and use them right away. Even the manufacturers don't seem to agree on whether burning in is a thing or not. It's not scientifically proven, you know?
I prefer to use my headphones right away, but I don't overdo it, I keep the volume down to a comfortable listening level. Sometimes I leave them playing some soft music at a low volume. Does it work? I think so. The sound becomes a little bit better (or maybe I become used to it, I don't know).