system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If humans can only hear sounds between 20Hz and 20,000Hz, how does it matter if headphones and speakers have frquency ranges that are greater than 20-20,000?
gpt
We can feel frequencies below our audible range. Some film producers/directors use "infrasound", as in, sound that has a frequency of below 20hz to introduce suspension or fear in the audience to enhance a scene.

When you are walking on a suspension bridge and it sways, you can feel that, its still vibration, just not audible. If the bridge vibrated hard enough and fast enough, you would hear it as it would push and pull the air fast enough to make it audible.

In terms of headphones, the effect of infrasound and sounds above 20khz are negligable. That's because the drivers \(speakers\) in your headphones are more than likely too small a diameter to accurately produce those frequencies to a sound pressure level \(db\) that you would be able to "feel".