Definitions for "Ported"
Keywords:  oblique, firearm, vent, gases, boat
Holes cut at an oblique angle to the surface, e.g. port hole on a boat. Usually used to vent gases from on a real firearm.
If the port length and diameter is correctly matched to the box volume and subwoofer's characteristics it will greatly increase efficiency and a good ported box offers lower distortion.
Keywords:  gates
Having gates.