pataburd
Headphoneus Supremus
The K501 offer an expansive and well-delineated soundstage that is incredibly cohesive, too. I haven't yet heard the K1000, but the K501 are to me the best-staging and most musically involving open set of headphones I've owned to date.
Tubes definitely do the K501 justice, BTW! : )
Tubes definitely do the K501 justice, BTW! : )