What type of sound was preferred by some individuals according to studies involving sounders in alarm systems?

The preference for a low-frequency 520-Hz square tone in alarm systems is supported by various studies indicating that such sounds are more effective in capturing attention and prompting immediate responses compared to other sound types. Low-frequency alarms are generally perceived as more urgent and less likely to be ignored, which is crucial in emergency situations where quick action is needed.

Furthermore, low-frequency sounds can engage the auditory system in a way that is less fatiguing over time, making them more effective for prolonged alerts, such as in the context of an intrusion detection system. This preference stems from the physiological and psychological responses that these tones evoke, making them particularly well-suited for alarming scenarios where clarity and immediate reaction are paramount.

In contrast, other sound options such as high-pitched tones or melodic tones might not convey urgency as effectively and could lead to quicker desensitization, reducing their overall effectiveness in prompting a necessary response during an intrusion event.