“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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I think the 4th generation refers to this:
BD-10 1st gen
BD-30 2nd gen
BD-50 3rd gen
BD-35 and BD-55 4th gen