Headphones may include an ear-cup housing and an audio driver disposed at least partially within the ear-cup housing. The audio driver may include a driver housing, a diaphragm suspended from the driver housing, one of a magnet and a coil carried on a back side of the diaphragm, and another of the magnet and the coil carried by the driver housing behind the diaphragm, the magnet and coil magnetically coupled with one another such that electrical current flowing through the coil generates a magnetic force acting on the diaphragm through the magnet or coil carried on the back side of the diaphragm. A port may extend through a surface of the driver housing directly between an acoustical cavity within the driver housing and an exterior of the ear-cup housing without communicating acoustically with a volume of space outside the driver housing and within the ear-cup housing.