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Exposure to loud sounds or extreme frequencies can damage your hearing or your speakers. Humans generally can't hear sounds below 20 Hz or above 10,000 Hz. If you increase your volume to hear these ranges, you may expose yourself to dangerously loud levels — especially in the high range where your hearing is most fragile.
Safety Tip: Set your device to a comfortable volume using a 1,000 Hz tone. Avoid turning it up much beyond that, even if you can't hear other tones well.