The JBL startup sound comes from the power-on audio used across JBL consumer audio devices such as portable Bluetooth speakers and some headphones. Online, people share it as a recognizable tech cue because many listeners have heard it in everyday use. It appears in short edits, setup videos, and memes where a device is being turned on or paired. Its continued popularity comes from how quickly it signals speaker culture, portable audio, and the start of a session without needing any visual explanation.