A hazard detection system (105, 107; 205, 207; 500), comprising: a loud sounder (218, 234, 235; 518, 534); a microphone (250; 580); a motion sensor (222; 572); and a processor (210, 230; 510, 530) coupled to the loud sounder (218, 234, 235; 518, 534), the microphone (250; 580), and the motion sensor (222; 572), wherein the processor (210, 230; 510, 530) is operative to: determine a non-invasive time frame to perform a sound check of the loud sounder (218, 234, 235; 518, 534) based at least in part on data acquired by the motion sensor (222; 572), wherein the non-invasive time frame is further based at least in part on a schedule of acceptable time of day to perform the sound check; and self-administer a sound test of the loud sounder (218, 234, 235; 518, 534) at the determined non-invasive time frame, wherein executing the sound check comprises: temporarily activate the loud sounder (218, 234, 235; 518, 534); monitor the microphone (250; 580) for an audio signal during the temporary activation of the loud sounder (218, 234, 235; 518, 534); and determine whether the audio signal satisfies sound check criteria; and report a result of whether the audio signal satisfied sound check criteria. a loud sounder (218, 234, 235; 518, 534); a microphone (250; 580); a motion sensor (222; 572); and a processor (210, 230; 510, 530) coupled to the loud sounder (218, 234, 235; 518, 534), the microphone (250; 580), and the motion sensor (222; 572), wherein the processor (210, 230; 510, 530) is operative to: determine a non-invasive time frame to perform a sound check of the loud sounder (218, 234, 235; 518, 534) based at least in part on data acquired by the motion sensor (222; 572), wherein the non-invasive time frame is further based at least in part on a schedule of acceptable time of day to perform the sound check; and self-administer a sound test of the loud sounder (218, 234, 235; 518, 534) at the determined non-invasive time frame, wherein executing the sound check comprises: temporarily activate the loud sounder (218, 234, 235; 518, 534); monitor the microphone (250; 580) for an audio signal during the temporary activation of the loud sounder (218, 234, 235; 518, 534); and determine whether the audio signal satisfies sound check criteria; and report a result of whether the audio signal satisfied sound check criteria. determine a non-invasive time frame to perform a sound check of the loud sounder (218, 234, 235; 518, 534) based at least in part on data acquired by the motion sensor (222; 572), wherein the non-invasive time frame is further based at least in part on a schedule of acceptable time of day to perform the sound check; and self-administer a sound test of the loud sounder (218, 234, 235; 518, 534) at the determined non-invasive time frame, wherein executing the sound check comprises: temporarily activate the loud sounder (218, 234, 235; 518, 534); monitor the microphone (250; 580) for an audio signal during the temporary activation of the loud sounder (218, 234, 235; 518, 534); and determine whether the audio signal satisfies sound check criteria; and report a result of whether the audio signal satisfied sound check criteria. temporarily activate the loud sounder (218, 234, 235; 518, 534); monitor the microphone (250; 580) for an audio signal during the temporary activation of the loud sounder (218, 234, 235; 518, 534); and determine whether the audio signal satisfies sound check criteria; and report a result of whether the audio signal satisfied sound check criteria. <EOS>