Can I add an outboard Equalizer to my music streamer ?

@garebear will you share the components in your system.  As others have said, spotify is not great, but maybe a small investment in a streamer and streaming service would yield huge improvements.  I am happy with a used Node 2i acting as a streamer for Qobuz.  

Spotify is greatly compressed... while an equalizer or better streamer may help a little, since the source is compressed it will always sound compressed...

Lol...  Oh you said outboard...  Neve shelford channels or Manley Massive Passive...