Transcoding flac:wav odd sound

[Foxman50]

im using a Synology 212j to feed a naim streamer using nstream on ipad. Ive previously been using Synology's media server on the NAS to supply music. I use an old version DSM 3.2 build 1955 as this is the last version that supported transcoding of hiRes flac's to wav.

Anyway thought id try out Minimserver with Minimstreamer and have to say i like what i see and hear mostly. Very flexible, but to be honest ill never use most of its flexibility.

Sorry to my point, when i set transcoding = flac:wav i get a very dull sounding playback. Its like all the high frquencies have been stripped away and its lifeless. Changing to flac:wav24 sorts the issue out. There is definitely a slight difference between media server's playback and minimserver's playback when transcoding, even with Minimstreamer set to flac:wav24.

To be honest i wasnt expecting there to be a difference, as i thought one setting just converts flac to wav keeping bit depth and the other does the same but up samples everything to 24bit. I wondered what others have found and what the reasons maybe for the difference in sound quality im getting