If a sound is continuous or steady, you perceive it softer than an irregular one. When it comes to music, you may perceive it as louder than it is. This level is considered safe as the golden rule is to not exceed 60% of the volume for longer than 60 minutes at a time. If you are listening to music on your iPhone headphones, for example, 55 decibels would be at about 53% of the volume.
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