Never say sorry on here my friend, its all good banter I'm keep getting tempted to go back to tubes with these... But then I remember the journey I went on with amp matching the HD800 and how long it took me to find my perfect match. The hd700 are indeed different though, and my only reservation is; if the sound may become too polite? I'm finding these a very relaxing listen apart from the top end on SS hp amps. At the moment my vintage NAD amps give a warm but punchy sound. Trebles are rolled off ever so slightly and the sound also has some impact. Hmmm... I've never owned a Crack as they are hard to come by in the uk but would love to try one.