Maybe your software is showing the music file sample rate (44.1 for cd audio)? The pdf link I posted shows how it works in STM32F0xxx. All my HW/SW says that all zishans only have 16bits 48Khz in USB DAC mode. In win10 right click in small speaker icon next to to the time in bottom right. Select SOUNDS from menu. Select PLAYBACK tab. Select Zishan and press PROPERTIES button. Select ADVANCED tab. Here you can see all sample rates available, other devices will have more sample rates in a drop down list. Android neutron player also detects 16/48, I don't have UAP, but it was mention here and some post after: https://www.head-fi.org/threads/the-zishan-dsds-corner.826185/page-101#post-14718591 Android Neutron player: Android Poweramp also detects 16/48: I also love the Z2 sound, I was listening to Z2 all afternoon. In my Z2 I replaced the opamps for same models, but genuine, I also replaced the audio caps for genuine nichicon gold and increased the power cap, sound got much better. I did't mod it more because I like it like this very much.