You probably had a weak link in your chain bro! Of course you couldn't tell the difference!
Seriously though, that's really great and was probably liberating to eliminate the need for some gear. I'm curious to put my micro SD into my s9 and see how it compares. Since I've had a DAP, I don't really use my phone to listen to music at all.
I just plugged my Solaris into my s9 and it has very satisfying bass
I think I will do this more often lol. Also, zero hiss!
My theory on DAPs is that the difference between most is a power difference, which is going to change the sound, however the OEM chooses to flavor the sound, and features (WiFi, streaming apps, etc.)
With the WM1A, you can change the sound by reverting to other firmware. Sounds weird but it's true. Through it's lifetime, they added features to it and also matured the sound through the firmware. Between 1.2 and 3.01, they seem to have lessened the bass a bit, but clarity and somehow the separation had increased nicely.
Anyway, I think that switching through daps from different companies is only changing the sound signature and power delivery. We're at a point in time when most dacs/DAPs have a similar clarity and sound quality.