Hiss during playback of DSD files

All piCorePlayers above ver. 4.1.0 produce audible hiss during playback of DSD files (I have .dsf) in my system. These are converted to PCM at 352Khz.

I have DSDplayback plugin installed and I have PCM5242 and IQaudIO Pro I2S DACs both have the same issue.

I'm runnung Logitech Media Server Version: 8.3.0 - 1649774106 on Fedora 35 machine.

I've just tried piCorePlayer ver 8.2 - same problem. With piCorePlayer ver. 4.1.0 no problem at all. I wonder what cause would be.