Modular earphone

A modular earphone segment housing an acoustic waveguide therein, the acoustic waveguide having an inner end and an outer end, at least the inner end being open, the modular earphone segment comprising:

• an acoustic seal module housing therein a first section and the inner end of the acoustic waveguide,
• a body module housing therein a second section and the outer end of the acoustic waveguide, and
• an acoustic transmission module,
• wherein the acoustic seal module is configured to be connected to the body module by releasably coupling means and the body module is configured to be connected to the acoustic transmission module by connecting means such that, when connected, the first section of the acoustic waveguide is substantially continuous with the second section of the acoustic waveguide and the acoustic seal module, the body module and the acoustic transmission module are acoustically coupled, and
• wherein the acoustic waveguide comprises, between the inner end and the outer end, a series of acoustic horns intercalated between a series of transition regions such that a first acoustic horn of the series of acoustic horns is housed near the inner end of the acoustic waveguide and a last acoustic horn of the series of acoustic horns is housed near the outer end of the acoustic waveguide.