Different audio quality on via upnp bridge and streamer app

Hi i tried to roonify a Burmester Mediastreamer 150. Evertything
worked fine, but the audio quality via the upnp bridge is worse than with burmester app. It lacks in dymamics and sounds somehow dull.
(Sorry English is not my first langauge :wink: )
Any ideas how to solve this? My dealer is very interested in the setup, but obviously, its not usable like this. Any ideas? Thanks a lot!

Contact me directly and I can take a look at your setup.