system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do speakers generate sound?

Subquestion: why is it that smaller heaphones usually can't product strong bass sounds compared to bigger speakers?
gpt
What we know as sound is our response to pressure waves in the air around us.  The frequency (how close together) and amplitude (the size) of these waves make different sounds.

A speaker creates pressure waves by moving a cone back and forth.  By moving at different speeds and over different distances, it creates waves of specific frequencies and amplitude.  The cone of the speaker has a magnet attached to it.  Near that magnet inside the speaker housing is a coil of wire.  When electricity is run through the coil of wire the magnet gets pulled toward the coil.  When the electricity in the coil stops, the magnet springs away from the coil due to the shape of the speaker cone.  Running electricity through the coil at differing frequencies and for differing durations cause the speaker cone to move sound waves at various frequencies and amplitudes.

Headphones usually have very small speaker cones and very small magnets.  Because of this, they are usually not very good at creating low frequency sound waves.