@hykhleif
I can't comment at the moment in regards to eq, but to use the ZX2 as a transport, it must be by way of sending a digital signal, as the Mojo only accepts a digital input. Personally I recently acquired a Mojo, but have no plans to sell the ZX2, as this is a very good dap, with very good battery life. I was thinking to use the ZX2 as a transport, but the Sony digital cable, the WMC-NWH10 USB Conversion cable makes for quite a bulky setup. I purchased a cable off of Amazon:
http://www.amazon.com/gp/product/B00YWEHSQY?psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s00
This cable is billed as working with another dac/amp, the HA-2, but it doesn't work with the Sony. Another Headfier linked me a cable on Taobao, and I was able to purchase it using Google translate, but strangely, there was a lot of information which didn't translate. I did purchase it, and it came with free shipping, but I don't have full confidence that it will actually get all the way here (?).
I'm thinking that the ZX2 is not a great transport for the Mojo anyway, as sending a digital signal out kills the battery to an extraordinary extent, I think some members mentioned that they were getting somewhere in the neighborhood of 4.5 hours play time, so not really worth it to me for this purpose.
I was thinking to pick up a dx80, as these are getting up to 12 hours playback, and seems like it works well as a transport. I was thinking to use the optical connection.
I will say that I've found the UERR to be a GREAT match for the ZX2. This is a combination that I can find REAL satisfaction with. And this is compared to UERM, K10, ie800, and Angies, though, to be fair, the Angies have been out of the house for a while, and are due back in the next couple weeks...
I will happily hold onto the ZX2 indefinitely; it's a very good player for my purposes.