I knew I was going to get this answer, quite reasonably so.
In my defense, I tried to find the Zout by searching and had no luck.
Thanks for the link!
Btw, if you don't find much difference between your phone and the ZX300 when pairing with the Andro, is there any DAP you found that gives you an improvement? I'm looking for something relatively cheap that will give me better sound than I'm getting from my Galaxy S8, but to be honest none of the DAPs I've tried have shown a noticeable improvement and I think most of the sound differences I've heard could be explained by Zout differences.
PS: Damn, my memory is failing me... we even had a quick exchange on the basis of the post you linked... The problem for me is that I can't pay attention to everything, so if the gear being discussed is not on my radar at that moment, then it doesn't register with me. I guess I could try to spin it and say I'm very focused.