Abstract: The headphones apparatus has at least one ear cup, and at least one operating element coupled to the ear cup for the regulation of one or more audio functions. To facilitate the regulation for the user, the operating element can include an annular dial that is accessible from outside of the ear cup. The annular dial may be rotational, shiftable, tiltable, depressable, deformable, or any combination thereof, relative to the ear cup to operably regulate one or more audio functions of the ear cup.

Abstract: A plug, particularly for connecting a musical instrument, a microphone, or the like, to an amplifier, a recording device, or the like, the plug includes a central rod-shaped conductor, a mushroom-shaped part at an end of the rod-shaped conductor, a sleeve of electrically conductive material surrounding the rod-shaped conductor at a radial distance, and an insulating material separating the rod-shaped conductor and the sleeve. A cylindrical bolt is mounted at another end of the rod-shaped conductor and has two bolt portions with different diameters extending transversely of the rod-shaped conductor. The sleeve has electrically conductively connected thereto a surface portion which at least partially surrounds at a radial distance and is electrically insulated from the bolt portion having a smaller diameter.

Abstract: A plug, particularly for connecting a musical instrument, a microphone, or the like, to an amplifier, a recording device, or the like, the plug includes a central rod-shaped conductor, a mushroom-shaped part at an end of the rod-shaped conductor, a sleeve of electrically conductive material surrounding the rod-shaped conductor at a radial distance, and an insulating material separating the rod-shaped conductor and the sleeve. A cylindrical bolt is mounted at another end of the rod-shaped conductor and has two bolt portions with different diameters extending transversely of the rod-shaped conductor. The sleeve has electrically conductively connected thereto a surface portion which at least partially surrounds at a radial distance and is electrically insulated from the bolt portion having a smaller diameter.