Of course, when I put them on tonight, the rattling or whatever appears to be gone. So I'm happy again. No idea what that was about, and so I thought I should post to make sure Phiaton's build quality isn't called into question by my remark.
I am also amping them for the first time, with my A1, and they sound ridiculous. I never would have imagined they would respond this well to external amping, but they do. They are easily the equal of any closed full-size headphone I can think of, other than the D7000 and the Edition 8. I actually think they might work better in this configuration than as a portable.