What I want to know is if I put a tonne of power through it with a bass EQ, will the 70mm drivers will take it as well as the Z1R?
For basshead purposes, some of the Sony's are really competent.
Seems like it will definitely be direct competition to the Fostex TR-X00s as already alluded to - though will likely do better out of the box than each variant.
If it doesn't ring annoyingly loud like the Z1R when playing Finest hour by Submotion Orchestra, could definitely be an interesting mid-tier closed can and will hopefully shutdown the criticisms of the original.