Sennheiser is among the best headphone manufacturers in the world. The company’s very popular mid-range headphones are the HD 400, and they have recently launched three new models –HD 451,HD 461 andHD 471 in India. Priced at, Rs. 5000, Rs. 5990 and Rs. 7990, the headphones are available at thecompany’s official e-store and regular headphone shops. TheSennheiser HD 451 sports …