What has that got to do with one digital output sounding better than another? Ever entertain the thought that the person who told you this is clearly wrong? If the file is exactly the same and is being played via the same DAC = how can there be a difference.
Have you ever heard jitter? What does it sound like? I think you need to actually do some research my friend. Jitter hasn't been an issue for at least the last 20 years unless the components have intentionally been designed poorly. I can assure you the X7iis aren't a poor design.
So don't make the statement / answer to a query unless you actually know. Otherwise your reply is simply noise. Heaven knows the SNR on the whole forum is bad enough at the best of times.
Yet you haven't tested it (by your own admission).
What does this have to do with this:
You're too triggered about something
I said that "probably". I do not know. I let people decide whether it does or not. Some people hear different sound for different transports.
I tried different transports, but it always too me a while to set up the new transport so cannot do side-by-side proper comparisons.
A lot of people explained that the transport can change the signature more due to the current in the signal rather than the data. I'm a skeptical like you, so I cannot say for sure. The
probably part is what should be bolded.
As for why OTG is inferior to coaxial in my experience, if you really want me to give you a proper explanation, I will:
I always had signal dropouts with OTG to a USB DAC, with every single device I used OTG with. Sometimes it happened after ten minutes, sometimes only once or twice in an hour. I had a few USB DACs so far, and who knows what was not working at its best, maybe the microUSB was a bit loose, maybe the OTG cable was, maybe the OTG adapter itself didn't have the most reliable connection, but since it kept annoying me, I gave up on using OTG entirely and I rely more on either Digital out, APT-X BT, or the HO / LO of that device. I tested and tested, and I almost always lost the signal once in a 3-hour car trip (which is the only practical situation when I use OTG), so this is why at the end I hold the digital out in higher regards. I want to stress that I do review the "portable usage" part of a device when it is meant to be portable, I don't consider OTG a desktop solution, so if moving the cables might cut the signal in the solo of my favorite metal song (keeping in mind that I move and dance while listening to music), then I will stop using OTG in favor of another solution. You can notice that I rarely recommend OTG based DACs and such, I don't usually recommend OTG based storage either because of this. Typce-C and MicroUSB are both best if not placed under strain, and even as careful as I am with those, I still fear they might break.
And for the sake of it, I own multiple OTG cables, multiple USB DACs, two smartphones and a few DAPs, so I guess that my portable usage just placed too much strain on those cables to keep the OTG going properly. I will not recommend OTG over coaxial or other digital, I think that it is a "sacrifice solution", not because of a DAP or such, but because of the connector design itself. OTG cables are also short, kinda thick, and they always sit in tension.
Mojo was the worst in this aspect, not only it barely connected to anything I tried to connect it to via OTG, the signal was not stable. Again, I might only have broken cables, those are really cheap here, there is no brand making proper OTG and all of them are off-brand OTG adapters, so they are the weakest link in those chains, but why bother when FiiO has included a snazzy coaxial output and all
