Interesting article :
Full article here:The Sennheiser HD 555 headphones are great—so great that I've neglected to upgrade for many years. Thanks to a discovery by clever human being Mike Beauchamp, it turns out you can perform a free upgrade to these headphones and make them equal to their high-end counterparts.
It costs companies money to create several distinct products, so they often create a high-end version and then cripple it for the steps down. Such is the case with the Sennheiser HD 555s, which can become HD 595s by opening up the headphone casing and removing filters for each speaker.
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http://lifehacker.com/upgrade-a-pair...8Lifehacker%29
And details about how to do the conversion - here:
http://mikebeauchamp.com/misc/sennhe...to-hd-595-mod/
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