In an example implementation, a self-cooling headset includes an ear cup to form an ear enclosure when placed over a user's ear. A first valve is to open and release air from the ear enclosure, and a second valve is to open and admit air into the ear enclosure. A speaker cone is to translate an audio signal into audible sound, and a signal modifier is to modify the audio signal with a subsonic frequency signal to cause the speaker cone to generate air movement that produces sufficient positive pressure to open the first valve and sufficient negative pressure to open the second valve.