The HD 620S, a closed-back addition to our audiophile lineup, caters to audio enthusiasts seeking distraction-free immersion without compromising on natural, expansive sound. The reference-grade 42 mm transducer with a 38 mm diaphragm and ultra-light 150-ohm aluminum voice coil deliver the exceptional impulse response and smooth sound for which the entire 600 series is renowned. | Sennheiser | | Refurbished Excellent | HD 620S Headphones | Black | Best Buy