I found a dealer who sells HD681, its not red so it cannot be plain HD681, it has to be either HD681b or HD681f, I need the F. Does anyone know any physical difference between them?
The F version has white rings, while the B has grey ones.
Holy !$½#, how the hell did I missed that.
You either have a great eye for detail or great deal of knowledge of headphones, either way, Thanks!
Edit; just called the guy and turns out they have 681F, I was really praying for a B :(. Between 681f and plain 681 which would a better choice for rock? (I'm qualified and willing to mod it.)
bough 681 red... F was terrible for rock