Am I too late? Has anyone bought this dreadful, boring, bass-less, unmusical, power-hungry and distancing AKGs K 301/401/501 yet?
Honestly: I think I like even the Senns 580/600 better than those AKGs. I never understood them. Sure, they are spacious - at first. But you soon realize (well, I did) that their soundstage is less airy than ghostly. They just don't convey instruments as present at all. They just leave a faint, residual and not exactly believable image of instruments. As if they had long left the concert hall.
Now, the Beyers 770 and 990 Pros, they are extremely smooth, have a believabe soundstage, appropriate presence of instruments, leave intact their resonating bodies and their physical impact, and they have bass extension and control to be heard to be believed. To me, the AKGs don't come even close in conveying the emotional and captivating properties of music.
The 770 Pros render the harmonic and rhythmic structures of complex musical signals intelligible, because of their homogenous dynamic behaviour throughout the frequency range. The 770 Pros are very transparent, the 990 Pros slightly less so. Try to listen to symphonic orchestras with the AKGs, try to listen to the entries of, say, bass-violins and violins. Are they really in sync? Or listen to the timbre and rhythm of a grand piano. How many concert grands do they AKGs make out of a single one?
Well, Odin, I guess one could say I prefer the Beyers.
BTW, lini, have you listened to the 770/990 Pros by now? I feel, they are even better than your 531s. They are warmer, more homogenous and natural and probaly even less fatiguing. And it seems you have really grown to like the 531s.