An electronic device may include a housing having an audio output port therein, a display carried by the housing, and a baffle enclosure carried within the housing. The electronic device may also include an audio output transducer carried by the baffle enclosure and acoustically coupled to the audio output port, and internal partitions carried by the baffle enclosure to define a serpentine tuning port therein acoustically coupled between the audio output transducer and the display, and acoustically isolated from the audio output port.