Upsampling

Thanks for great responses I’m learning something new 
I have Cambridge Azur 851N is upsampling 
I stream from tidal Qobuz and Spotify 320kb 
the fact is when I stream 16/44.1 on both tidal and Qobuz vs Spotify 320kb same original recorded music / version can’t tell the difference 
I can easily see the difference in 24/96 ,24/192 and MQA  but not on 16/44 vs 320kb
 is because of upsampling? my system includes Klipsch KLF 30 Parasound A21+ Michi P5 preamplifier Parasound P6 Sony Z1 a pair of SVS SB16 ultra and PC13 ultra and MacBook Pro thanks 

Way way larger differences between uncompressed 16/44.1 and Spotify 320kb, then between 16/44.1 and 24/96 or 24/192. 24/96 and 24/192 may be different versions. Oversampling would have nothing to do with it.

The 851n does feature 24/384 Upsampling but that surely is not default.
It has to be in the settings to choose what level of Upsampling you desire or run native.

I can clearly hear a big difference between Spotify and even base Qobuz of 16/44.

Upsamples everything to 24/384. If they didn't, they would have to use more aggressive analog filters and/or selectable filters. This makes it easier and may make the clock easier.