I've been noticing a difference in sound quality when streaming spotiy to my airport express between the iOS App and the Desktop on my Macbook - The iOS app seems more compressed, with less definition especially in the high end. The desktop sound seems to have more depth in general.
I have premium and settings on both devices are at max. quality with audio normalization off.
It seems kind of weird to me as both devices send over the information digitally to the airport express - the DAC of the airport express sends it to my hifi set-up. Why is there a difference?
are there any explanations/thoughts on this?