If you email them about the balance question, state why you want it and while this may seem obvious stated a reason and benefits states more that you just want it.
I think the die has been set for the DX90. Would I like balanced out to the PB2? Maybe. I like balanced but what are you taking the balanced signal into? There isn't room in the DX90 for balanced headphone out and the battery life would be too short. A balanced line out would work but to what? I don't care to go from two of the top dacs for portable on the market, if not the top portable dacs to lesser ones, just to have balanced out into lesser dacs. If source balanced out into a home balanced system, I can totally see this. Again, state a reason and benefit.
I believe the DX90 single out is going to be excellent. I already know what the DX100 sounds like with a desktop Sabre dac, now the DX90 will have two Sabre dacs and while the portable Sabre dacs don't quite measure the same as the desktop version, I don't expect that in a listening test you are going to hear much difference and now with Two used, my feeling is that the DX90 will equal most any dap on the market and surpass even many of the other top daps out there, maybe even the DX100.
Edited by jamato8 - 1/8/14 at 12:49pm