I'm with PapaThrust on this one. And yes, I'm salivating over the X3, having bought and loved most of the FiiO range so far, but haven't pressed the button on one because of the lack of eq options.
I'd like to contemplate the step up from my Nano 3rd gen through an E12, but - here's my dirty secret - I'm using the 'loudness' preset of the Nano. Because it gives me almost *exactly* the sound signature I want to heartily enjoy my V-Moda M80s when out and about. Do I need the extra bass and treble lift of that preset? No, not really. What I actually need is to be able to drop down the specific bit of the upper midrange that I find a bit shouty and fatiguing, without losing any of the other frequencies. And I could do that with a parametric. But at least the loudness eq preset on the Nano kind of does that, even if it lifts the treble and bass a bit. I can live with, and often enjoy that, but leaving the eq flat takes away a lot of the pleasure.
The X3 is very much what I've been hoping for from FiiO (either that or a lower priced small DAP that would send data to my E17) but I won't buy one without some kind of customisable eq.
The perfect product? An X3 with save-able custom parametric (find the setting that works best for each set of headphones and then just leave it!) and an amp bypass for when connected to an E12. That'd be me sorted.