India, Oct. 3 -- This sort of longevity is rare. For any tech brand to be doing what they are, for 80 years straight, is no mean feat. Turns out, Sennheiser has achieved that milestone this year, of delivering audio as the artists intended it to be heard. Very few brands have had that sort of stamina, and in recent years, there have been moments of competitive sparks from the likes of Sonos, Bose, Sony and Apple. But largely, the Sennheiser sound signature, one that has always maintained a continuity of balance and purity, continues to be just that. Despite market pressures, an illustration of which is to sculpt the bass to sound more powerful, or heavy audio processing to forcefully try and reproduce finer details. There perhaps isn't a ...