The lowest frequency at which the device produces audio. The lower the low-frequency response, the stronger and juicier the bass.
2.Has sound isolation / passive noise reduction
vs No (51% don't have it)
The device sits tightly in place, creating an acoustic seal which reduces background noise and prevents your music from leaking out.
3.Can be folded
vs No (70% don't have it)
Folding devices are good for transporting as they take up less space in your bag.
4.Has an over-the-ear form
vs No (58% don't have it)
Comfortable full-size form with earcups that fully enclose your ears. This model is loved for its increased sound isolation and the fact that it won't leak sound to your neighbors. It offers potential for maximum bass and loudness levels.
5.Has a coiled cord
vs No (91% don't have it)
A coiled cord typically offers more flexibility as it can be extended, and taken outside for example.