I think Oratory's profile has been updated a bit. I have a 10-band PEQ version of (what I believe to be his latest) 650 profile and it looks like this:
Pre: -10 db
1: Peak 23hz, 2.6db, Q 1.6
2: LShelf 70hz, 7.5db, Q .7
3: Peak 210hz, -2.2db, Q 1.0
4: Peak 2.15k, 2.0db, Q 2.2
5: Peak 3.1k, -1.1db, Q 3.4
6: Peak 4.27k, 3.0db, Q 4.0
7: Peak 5k, -0.8db, Q 6.0
8: Peak 5.7k, 1.8db, Q 3.0
9: Peak 6.6k, 0.9db, Q 4.0
10: Peak 11k, 3.0db, Q 1.3
See here:
https://www.dropbox.com/s/zr5tqw0qojom9uh/Sennheiser HD650.pdf?dl=0