The HD600 soundstage is absolutely fine though realistic airy and nice separation. It is far more comfortable and pleasant to wear. If you have a HD600 you don't need a 150.
Cancel the order is my advice they are too similar (assuming you get a good DT150)
They have equal amounts of bass and there is zero veil with the 600; it has easily as extended and detailed treble as the 150. I need open backed for home use and the Sennheiser is 'end game' for me. Just perfect and a fitting replacement for my favourite but but poorly made disintegrating Focals
Edited by god-bluff - 4/19/17 at 3:35pm