The Sennheiser HD 300 PRO are closed-back, over-ear professional monitoring headphones designed for studio, broadcast, and live sound environments. They deliver precise, linear sound reproduction with high resolution across the entire frequency spectrum. With excellent ambient noise attenuation, rugged construction, and comfortable ergonomics, the HD 300 PRO ensures reliable performance during long sessions and demanding conditions. Key features Closed-back design for superior isolation Linear sound reproduction with high resolution Excellent ambient noise attenuation Soft, replaceable ear pads for comfort Rugged construction for professional use Single-sided coiled cable for convenience Collapsible design with rotating earcups Overview Transducer type Dynamic, closed-back Frequency response 6 – 25,000 Hz Nominal impedance 64 Ω Sound pressure level (SPL) 123 dB (1 kHz, 1 Vrms) Total harmonic distortion