Description. The Sennheiser HD 280 Pro Circumaural Closed-Back Monitor Headphones feature a collapsible design with swivelling earcups and extended low end reproduction. Rejection of outside noise is high, rated up to -32dB. Efficient neodymium magnets contribute toward an extended dynamic range and high output. The thick, padded leatherette earcups and adjustable padded headband allow for a precise and comfortable fit during extended periods of studio recording and mixing. Features. Circumaural, closed-back headphone. Accurate, linear sound reproduction for critical monitoring applications. High sensitivity. Very good attenuation of background noise. Collapsible, rotating earcups. Sturdy, modular design for durability