Sennheiser HD 620S Wired Headphones

The Sennheiser HD 620S feature a closed-back design with a stainless steel reinforced neckband slider and large, adjustable earcups padded with thick cushions. The headphones come with a 1.8m detachable cable with a 3.5mm plug. The cable can be unclasped with a simple twist and pull action. In the box, the headphone cable ships with a 3.5mm to 6.3mm adapter

They are equipped with custom-tuned 42mm dynamic transducers alongside a 38mm diaphragm, a nominal impedance of 150 Ohm and a 110dB sound pressure level. They offer a frequency response range of 6Hz to 30,000Hz.

The sound experience of the Sennheiser HD 620S headphones offers an overall balanced tuning. Although not positioned as bass-heavy headphones, they offer a decent, warm, sound stage. On one hand, the mids are well-balanced, however, the treble performance is sub-par. The passive noise isolation feature does not work too well, with environmental noises often leaking in.