Do you yearn for some quiet time? Acknowledging the fact that many of us have to live, work and travel in chaotic surroundings these days, the Sennheiser HD 4.50 BTNC headphones are an effort to create the most affordable noise-cancelling headphones yet. Happily, they also sound great with music and movies. And while the Sennheiser HD 4.50 BTNCs are...