Updating a much-loved product like the Sennheiser HD 650 is a tricky task. But having spent nearly 75 years in the audio business, Sennheiser understands the importance of reading the tealeaves. The personal audio industry is in a period of tremendous growth and no single segment is growing faster than the portable devices category. So with that, Sennheiser made a bold move. While many companies would have left well enough alone, Sennheiser took one of their most popular products, the somewhat hard-to-drive HD 650, and updated it with and easier to drive design.