hello , the ie800 are sensitive but are demanding about the quality of the source, and specification wise you must notice that the sensitive measure is made by ...db/1v and not ....db/1mw and thats a big diference
Freaking Sennheiser, and their (probably better) specs. You're right, of course. I missed the /V. Still, when you say that they're "demanding about the quality" that just means that they need a low impedance source. The ZX2 should still be able to drive them north of 118dB, so enough to damage your hearing. Of course, I don't know about the volume cap in the EU, that will affect it for sure, but I imagine it will still be pretty darn loud.
I have not measured the ZX2, but here is a lower 12 Ohm load on the ZX1, as well as my phone and the AK300. Not perfect by any means. Around .5 dB high on the low end, hits close to +/- 0 in the mids, and then rolls hard. Again, this is a lower impedance load, yours should be more flat. But even with that very low impedance load, you're keeping it within about +/- .5dB until around 7-8kHz. I would expect more from a Class D, which should when well implemented be pretty ideal for a low impedance IEM, but remember, that's the ZX1, they may have refined this for the 2. Someone else would have to measure it (or donate a ZX2 so I can
)
You could test if you wanted. If you have any sort of decent line in on your computer, download some RMAA, and feed it a test signal, see what you get (note that your results won't be terribly accurate from RMAA for anything except frequency response, unless you have a pretty darn good audio interface, I don't even pay attention to the other measurements).
If you're worried, I would for sure test before you go and buy a different DAP, even if your computer has a terrible audio interface, you can get a Behringer UCA202 and a splitter cable to do a loaded test for around $30 out the door from Amazon. Might save you lots of bling in the long run. If you decide to do it, it's not hard at all, but reach out to someone with experience on getting it set up. I use my Merlins without worry, but it's important to not run them at such a loud volume that you're going to kill them with the test signal. You just need to run it at a normal listening level (you don't want to actually listen to them, you just don't want to max the volume with your DAP when your headphones are plugged in to them, the test signal will get pretty loud - so I leave it around my natural listening level for the Merlins) then apply some gain with Audacity to get the level high enough for RMAA to do its thing.
and I take his words very "literally"
