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Side note should be that you need to add cushioning to the inside of the headphone cup. That's the reason why the sound quality decreases, you need to stop the sound from bouncing around in there! It works just like cushioning in a subwoofer box would. (the reason why you put cushioning in a subwoofer box) Just fit and spread out 2/3 cotton balls in there, that will solve the muddy sound quality afterwards.
*2 cotton balls is WAY TOO MUCH! just add a half of a cotton ball per cup and spread it out. :)