Abstract: A head wearable air purifier includes a headgear, an air purifier assembly supported by the headgear, a nozzle assembly and a mask body. The air purifier assembly includes a filter and an airflow generator for generating an airflow through the filter. The nozzle assembly is configured to extend in front of a face of a wearer in use. The nozzle assembly includes an inlet aperture configured to receive a filtered airflow from the air purifier assembly, and an air outlet for emitting the filtered airflow from the nozzle assembly. The mask body detachably connects to the nozzle assembly and defines a cavity for receiving a mouth and/or nose of the wearer. The cavity is in fluid communication with the air outlet.

Abstract: A sound system with a plurality of speakers is shown and described. The orientation of a second subset of the speakers is automatically adjustable relative to the orientation of a first subset of speakers. In certain examples, the system detects whether the audio signals it receives include up-firing content and adjusts the relative orientations when such content is provided. The sound system is also configured to calculate a desired degree of rotation for the speakers in the second subset based on the geometry of the room in which the sound system is located and the location of the listener in the room.

Abstract: A sound system with a plurality of speakers is shown and described. The orientation of a second subset of the speakers is automatically adjustable relative to the orientation of a first subset of speakers. In certain examples, the system detects whether the audio signals it receives include up-firing content and adjusts the relative orientations when such content is provided. The sound system is also configured to calculate a desired degree of rotation for the speakers in the second subset based on the geometry of the room in which the sound system is located and the location of the listener in the room.

Abstract: A speaker system can include a speaker core and a removable jacket. The speaker core can have a housing and a speaker positioned within the housing. The removable jacket can cover the speaker on an outside surface of the housing, the jacket extending along at least three sides of the housing. Among other features, the speaker core can be used with one of among a number of different jackets to form different speaker systems.

Abstract: A speaker system can include a speaker core and a removable jacket. The speaker core can have a housing and a speaker positioned within the housing. The removable jacket can cover the speaker on an outside surface of the housing, the jacket extending along at least three sides of the housing. Among other features, the speaker core can be used with one of among a number of different jackets to form different speaker systems.