This might help explain the difference between the 630 & 650; posted it in the engadget post comments. (don't mean to double post but only here to help)
“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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Is the 630 a 650 with a USB port?
This might help explain the difference between the 630 & 650; posted it in the engadget post comments. (don't mean to double post but only here to help)
http://www.john-michaeldelvalle.com/2008/07/25/samsung-2008-lcd-comparison-chart