A waveguide assembly (120, 220, 320) for guiding sound, the waveguide assembly (120, 220, 320) including: a chassis (130, 230, 330) that provides a cavity configured to receive sound propagating in a forwards direction along a primary axis (122, 222, 322) of the waveguide assembly (120, 220, 320); a fixed waveguide (140, 240, 340) that is fixed with respect to the chassis (130, 230, 330) and positioned on the primary axis (122, 222, 322) of the waveguide assembly (120, 220, 320), wherein the fixed waveguide (140, 240, 340) is spaced apart from the chassis (130, 230, 330) and is configured to guide sound received by the cavity through at least one opening (134, 234, 334) formed between the fixed waveguide (140, 240, 340) and the chassis (130, 230, 330); a moveable waveguide (150, 250, 350) that is moveable with respect to the chassis (130, 230, 330) between: a standby position in which the moveable waveguide (150, 250, 350) is configured to obstruct the at least one opening (134, 234, 334) and, together with the fixed waveguide (140, 240, 340), form a forward-facing surface of the waveguide assembly (120, 220, 320); an operational position in which the moveable waveguide (150, 250, 350) is configured to allow sound to exit the cavity through the at least one opening (134, 234, 334); wherein the moveable waveguide (150, 250, 350) is configured to be moved from the standby position to the operational position by retracting at least a part of the moveable waveguide (150, 250, 350) in a rearwards direction along the primary axis (122, 222, 322) of the waveguide assembly (120, 220, 320), wherein the rearwards direction is opposite to the forwards direction. a chassis (130, 230, 330) that provides a cavity configured to receive sound propagating in a forwards direction along a primary axis (122, 222, 322) of the waveguide assembly (120, 220, 320); a fixed waveguide (140, 240, 340) that is fixed with respect to the chassis (130, 230, 330) and positioned on the primary axis (122, 222, 322) of the waveguide assembly (120, 220, 320), wherein the fixed waveguide (140, 240, 340) is spaced apart from the chassis (130, 230, 330) and is configured to guide sound received by the cavity through at least one opening (134, 234, 334) formed between the fixed waveguide (140, 240, 340) and the chassis (130, 230, 330); a moveable waveguide (150, 250, 350) that is moveable with respect to the chassis (130, 230, 330) between: a standby position in which the moveable waveguide (150, 250, 350) is configured to obstruct the at least one opening (134, 234, 334) and, together with the fixed waveguide (140, 240, 340), form a forward-facing surface of the waveguide assembly (120, 220, 320); an operational position in which the moveable waveguide (150, 250, 350) is configured to allow sound to exit the cavity through the at least one opening (134, 234, 334); a standby position in which the moveable waveguide (150, 250, 350) is configured to obstruct the at least one opening (134, 234, 334) and, together with the fixed waveguide (140, 240, 340), form a forward-facing surface of the waveguide assembly (120, 220, 320); an operational position in which the moveable waveguide (150, 250, 350) is configured to allow sound to exit the cavity through the at least one opening (134, 234, 334); wherein the moveable waveguide (150, 250, 350) is configured to be moved from the standby position to the operational position by retracting at least a part of the moveable waveguide (150, 250, 350) in a rearwards direction along the primary axis (122, 222, 322) of the waveguide assembly (120, 220, 320), wherein the rearwards direction is opposite to the forwards direction.