Hi, there is a problem with the playback through the Hi-Res audio output.
My phone is а Samsung Galaxy Note 4 SM-N910C [Exynos SoC] (Android 5.1.1), Poweramp version v.3 alpha build 703. If you are using Hi-Res audio output (Wired Headset / AUX) only the crackle is heard. I went through all the settings of the audio output: changing the sample rate, and so cut off the DVC - unsuccessfull. The rest of the audio outputs are working correctly. Reset application settings and reinstalling does not help solve the problem. The same error is reproduced on v.3 alpha build 702.