The Sennheiser HD 620S have a sound profile that highlights melodic instruments, which works well for classical, older pop, folk, and soul music. It’s not going to bring the thumpy bass you want for EDM or bring attention to the vocal details of your favorite diva’s voice, though. Because our bass measurements for over-ears use level-matched results from real human ears in combination with the testing rig’s results as outlined here, there’s a clear disparity between these results and the bass measurements using solely the testing rig. In the measurements using only the testing rig, you can see that these output a good amount of bass, but largely due to their inconsistent frequency response (which you can see in the next test), bass frequencies take a massive hit when the headphones are worn by different people, which is the most important consideration.

Overall, the headphones have a somewhat neutral frequency response with laid-back bass and relatively even mids and low-treble. The overall treble response is uneven and alternatingly darkens vocals and can sound overly bright on sibilant sounds like cymbals and Ss and Ts. Their de-emphasis in the treble response can make lower frequencies sound fuller because they don’t compete with the treble for your hearing’s attention.

The Sennheiser HD 600 boast a somewhat similar sound profile, except that the HD 600 sound far more accurate in the treble region. If you want more bass, the Beyerdynamic DT 700 PRO X supply a more neutral low-end than the HD 620S, even though they’re also voiced with a more piercing top-end.