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.
Flips Solo 2 Social: 4 Ohms
3. sound pressure level
Devices with a higher sound pressure level are generally louder when supplied with any given audio source.
AKG K553 Pro: 144dB/mW
4. no battery needed
This device works without batteries. It weighs less and you don't have to worry about recharging or replacing the battery.
69% have it
5. has a detachable cable
With a detachable cable you can use alternative cables, and if the cable is pulled it will pop out instead of breaking.
39% have it
6. has an in-line control panel
There is a control panel on the cable, so you can easily operate the device without having to interact with it.
46% have it
7. has stereo speakers
Devices with stereo speakers deliver sound from independent channels on both left and right sides, creating a richer sound and a better experience.
76% have it
8. has a straight plug
A straight plug is better when the jack is on the top or bottom of your player.
50% have it
9. number of microphones
More microphones result in better sound quality and enable the device to filter out background noise.
Parrot Zik Sport: 8
10. has an on-ear form
This device comfortably rests on top of your outer ears. As it doesn't block out everything from the outside world, it's preferred in places like office environments and recommended for outdoor activities.