Abstract: An earphone is provided that has two diaphragms that are stretched on a frame and that are driven by means of an electroacoustic sound transducer that is not provided in the region of the two diaphragms. Instead, the sound transducer is acoustically coupled to the two diaphragms via a sound duct. The sound transducer preferably has a front and a rear volume, wherein the front volume of the sound transducer drives the two (parallel) diaphragms via the sound duct. This allows the provision of no electroacoustic reproduction transducer in the central region of the earpiece of an earphone.

Abstract: There is provided an electroacoustic sound transducer comprising a diaphragm and at least a first and a second coil coupled to the diaphragm so that the first and second coils can vibrate together with the diaphragm. The electroacoustic sound transducer unit has an impedance switching-over unit for connecting together the at least first and second coils to provide a series circuit or a parallel circuit or for contacting the first coil or the second coil.

Abstract: An earphone is provided that has two diaphragms that are stretched on a frame and that are driven by means of an electroacoustic sound transducer that is not provided in the region of the two diaphragms. Instead, the sound transducer is acoustically coupled to the two diaphragms via a sound duct. The sound transducer preferably has a front and a rear volume, wherein the front volume of the sound transducer drives the two (parallel) diaphragms via the sound duct. This allows the provision of no electroacoustic reproduction transducer in the central region of the earpiece of an earphone.

Abstract: A headset, which can have an electroacoustic reproduction transducer, a unit for performing active noise reduction and a boom microphone. The headset further can have a voltage converter unit for converting a supply voltage received into a supply voltage for the active noise reduction unit.