For IEMs and IEMs only, I will chime in with the sony zx507. It is one of the few daps That I liked. But there are a few caveats:
- As stated, IEM only. And probably not hard to drive ones.
- Streaming may cut your battery life dramatically.
- Not the smoothest experience.
Ultimately, my usage got as little as 4.5 hours on a charge. And never more than 9 (even with wifi and everything turned off while relying on my streaming service downloaded tracks). On a device that claimed 18-20 hours. I assume this means with their built-in player, which I could not use. I followed sony’s battery saving instructions exactly.
Outside of that, it is, without a doubt, the best dap I have put my hands on thus far. And I had the dx300 right before it.
Obviously not tubes, but good streaming daps are basically a unicorn.
I have not yet tried the hiby r6 2020. I will probably some day. But it’s the only dap left that I have any hopes of working well.