"Now it’s time to take it a step further and examine speaker cabinets themselves, these simple-seeming boxes that many guitarists consider just a “carrying case” of sorts for the drivers, but which add resonance and color to every note you play.
In combination with the speakers themselves, the cabinet into which they are mounted contributes enormously to an amplifier’s overall tone. The size and construction of the cabinet influences resonance, low-end content, projection, and even frequency content"
just a quote from gibson tone tips