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Followup: Second day of breaking in. No rattles. There are 2 serial numbers on the box, one is SNo. 1445, and the second one is the real serial number H-SNo, which has some numbers first and then -001692, which is the serial number printed on the headphone itself. I'm not a pro, and this is only my second "expensive" headphone, the other ones being HD598 (3 years old). I think K7xx still needs more breaking in. K7xx has more bass and darker, HD598 is brighter, mids about the same. The placement of instruments and vocals is currently still more accurate in my listening in HD598, and the clarity is still better in HD598. We shall see in a few days.