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The blog post doesn't mention all of the aesthetic differences--which, at the current Amazon price point, could justify the price difference for some--so I thought I would mention the others here:

-the headband is leather -cans have a Sennheiser logo on them -cans have a chrome ring around them -comes with a nifty headphone stand / mount

disclosure: I own some 555's, and will be trying this mod at the office on Monday.

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FWIW, I did the mod, but I don't have an effective way to AB test. Tried one ear at a time, but could not detect the difference. Went ahead and removed the foam from the other, and the increased sound stage sounds great (though without an accurate test it's difficult to say how much of a change is placebo vs. noticeable).

Once the foam is removed, how did you access the driver assembly? Is the screwdriver used as a prying tool?

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