Cool, man. Science in action.
Have either of you compared your 518s to a decent closed headphone in a similar price range like the M50? I only have closed headphones and I'm thinking of getting something like a 518 for better soundstage and instrument separation. I'm really happy with my Z02 + M50 setup though; I wouldn't want to lose any of that incredible sub-bass.
I guess. All of this is so subjective it's tough to be sure about anything.
I've only compared it to nice open headphones The 518 feels stuffier than the 580, definitely. The soundstage is pretty flat.