Spotify sounds compressed

So now that I have more time to mess around with things like this, I started using Spotify and went premium right away. But it sounds compressed. I looked in the settings and the high quality streaming switch is on. When I switch it off, there is no change in sound.
I have my Samsung tablet hooked up to the preamp using it as the source while using my Asus notebook to manage things. The settings on the tablet are set to receive extreme quality signals. When I listen to Radio Tunes the signal sounds much better with extended highs and very deep lows. It just seems to me that the Spotify highs are compressed, not very extended. Is this the norm? I think Spotify is excellent for finding new music, but it doesn't sound the best.