Abstract: An assembly including an apparatus and a device, the apparatus including a speaker configured to generate acoustic waves defining an alarm tone and a housing enclosing the speaker. The speaker is positioned within the housing such that a front chamber is between the speaker and at least one first opening of the housing, with the acoustic waves exiting through the at least one first opening. The device is coupled to the housing and includes a body having an aperture, a cavity, and at least one second opening, the cavity being positioned adjacent to the housing and configured to receive the acoustic waves through the aperture, with the acoustic waves exiting through the at least one second opening. The aperture, the cavity, and the at least one second opening are sized to collectively generate an increased output of the assembly within a frequency range of the alarm tone.

Abstract: Aspects of the present disclosure provide a system for selectively outputting indications of important events of which the user would like to be notified. Based, at least in part, on settings configured via user inputs, the system receives an indication of a detected acoustic event and determines whether the acoustic event corresponds an event in a list of preferences stored in a remote server. In response to determining that the events match, the system then instructs a personal audio output device to output an indication of the detected acoustic event to the user of the personal audio output device.