The lowest frequency at which the device produces audio. The lower the low-frequency response, the stronger and juicier the bass.
2.Considerably lower impedance
vs 42Ohms (the average)
vs 4Ohms (best: Flips Solo 2 Social)
Impedance is the device’s electrical resistance to the current being pushed through it. The lower the impedance, the easier it is to get higher volume and requires less power.
3.Has included ear pads
vs No (58% don't have it)
Allows you to change ear pads without buying new ones.
4.Way more microphone(s)
vs 1 (the average)
vs 8 (best: Parrot Zik Sport)
More microphones result in better sound quality and enable the device to filter out background noise.
5.Has an in-ear form
vs No (67% don't have it)
The in-ear device is ultracompact and lightweight, with little or no interference with earrings, spectacles, hats, or hairstyles. It is inserted in the ear canal itself and blocks out a lot of environmental noise. It has stronger bass tones and is unlikely to fall out of the ear.