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Headphone Break in tones
Here are some tones to help you break your headphones in a lot faster :-) Connect your phones to the computer headphone jack and open the 20hz, 30hz, 40hz and 20-16,000khz being sure to put each tone on a loop. Turn your computer headphone volume control to maximum ensuring the sound is not distorted and is comfortable to your ears. Leave the headphones connected for 24 hours and voila!  Job done.

20hz

30hz

40hz

20-16,000khz

So, to sum up..... you should have all of the above files open (playing) and they should be on a loop (repeat) and the volume set at loud but comfortable (no distortion)  
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Windows media player settings HERE