So I've had the Blak side by side with the Caspian M2 for a full day now and have already decided the trade up is a no-brainer. Out of the box it was happy to get right into things without demanding the weeks of run in time that many others do to even sound passable. That said, 12 hours of playtime has already improved it hugely.
I spent the first few hours switching between the Caspian and the Blak with the same track, to get a proper comparison across a variety of music types. My first observation was that the Blak conveys a greater perceived distance between each instrument. There is more breathing space between every instrument/vocal and each element is easier to isolate and focus on individually. Backing vocals and instruments that I had always been aware of but were just that, backing accompaniments, have been brought forward to the forefront and now play a bigger role than previously. Everything is simply sharper all round.
My initial observations of expanded soundstage and increased detail did, however, come with a few early concerns. Although it was easier to pick out individual parts, the overall cohesiveness seemed to suffer, with the sum of the parts not quite matching the individual brilliance of each instrument. The overall result seemed a little disjointed when compared with the Caspian but with extra hours of play time, the issue has disappeared completely. Tracks now sound as they should, every part working together in harmony.
Listening to John Williams' classic soundtracks highlights the Blak's ability to convey each instrument's position on stage superbly. The percussion and brass are powerful and authoritative, yet never drown out the subtleties of the harp and woodwind in the signature tracks of Star Wars, Indiana Jones, Superman and E.T.
Similar results from The Rolling Stones, Massive Attack, Beethoven and many more convinced me that the Blak will be keeping its place in my setup.
In short, it seems to do everything the Caspian M2 does but just that little bit better.