system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: In regards to high end headphones, what does a higher ohm set mean compared to lower ohm sets and what are the differences in sound quality?
gpt
A high impedance on a set of headphones generally just means it requires more power to drive them to an acceptable volume. 

Portable devices, walkmans, ipods, phones, will generally favour a lower impedance because they require less power. 

Old hifi gear, for example, tend to be built with higher impedances in mind, so using a modern set of low impedance earbuds on a hifi amp would probably mean you can barely nudge the volume off the zero stop before it'd be too loud to be tolerable. 

The main advantages of a high impedance in headphones, really are more about situations that you wouldn't encounter as a home user, or out and about. 

High impedance headphones are less affected by differences in output impedance on an amplifier, and you can connect a bunch of them to an output without overloading an amp. 

TL;DR: For home use or out and about, you'd be absolutely fine with low impedance ones. There's no reason for the average Joe to go searching out high impedance headphones. For most the only difference you'll note is that they're expensive, and you have to nudge the volume up a bit further. 

There are plenty of examples of very high end headphones that are low impedance.