New headphones, speakers, amps and so on require use for around 100 hours in order to get the best sound quality, during this time sound characteristics can change, frequency range can increase, audio may become clearer.
To understand why burn in is required for headphones and speakers you need a basic understanding of how speakers work. All noise is vibration of the air around us and speakers use a cone to push the air to create this audio, the cone itself is attached to a large electromagnet which moves depending on the voltage put into it. Over time the electromagnet starts to move more freely and thus the audio changes, the easiest way to notice the change is in the high frequencies where there will be more detail, this is because the magnet can now move faster and more accurately.
Amps and anything with a circuit board inside will also benefit from burn in as over time capacitors change characteristics. I had some wonderful explanation here as to why this happened, however it requires knowledge of electronics, reactance and so on and I'm sure if you're really interested in the reasons there are better explanations out there than my own. Some people will also recommend opamps and other chips be burned in, I'm sceptical about this as I can't fathom what would change over time so I'll simply say your mileage may vary here.
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