Don't waste your money, I've tried Zo2 with B2, Pro900, TF10, W3, and UE700...
UE700 and B2 responded worst with Zo2, you have to remember that Zo2 enhance the bass so if an IEM does not have a dedicated bass driver, as soon as you increase the bass volume, it will distort.
TF10 responded the best with Zo2, however, it made the soundstage smaller, and the overall sounds becomes too muddy...
PLEASE NOTE - that I have the first batch of Zo2 and about to return them to be repaired, so maybe that is the reason why? I am not sure...
HOWEVER - UE700 and B2 matched best with Fiio E6 and E11, it enhances the bass as well as enhances the whole spectrum, but still, it doesn't make UE700 to be basshead IEM








