alphanumerix1
1000+ Head-Fier
The Z1R is the smoother, more musical version of the M9. Definitely much better bass. However, it is heavier & bulkier, and it protrudes out more than the M9.
If the M9 is Sony's version of the Andro, the Z1R is Sony's take on the Atlas. But done in a way much better fashion. The Atlas is too boomy in the low end.
the z1r has a odd driver config, do you know which drivers handle which frequencies?