I’m curious of the difference between the dx3 pro and a30 pro… most of Topping’s lineup are so close in performance the listings show differences of something like 0.0001% vs 0.00008% THD. I mean, I love my dx5 in DAC mode, but it wasn’t a huge difference moving to that from the dx7 pro.
So, I’m inclined to think you’re hearing the difference between Spotify’s lossy 320kbps and Qobuz’s lossless up to 24/192 tracks. Might be interesting to do some testing while/if your Spotify account is still active.
Glad you’re enjoying the music! :)