@ojc Lumin devices support multiple music streaming protocols, so there is more than one way to get music to play through them. I am guessing you probably ended up using AirPlay to stream music direct from the Qobuz app to your Lumin T2. AirPlay will resample the audio data if you are attempting to stream higher resolution audio files—this is a function of AirPlay and not specifically Qobuz or Lumin.
Regarding the SBooster, it will void your warranty to do that sort of modification.