I'm not sure if this has been mentioned/discussed before but after a quick search I couldn't find anything.
Apparently unlike WMP Spotify doesn't have it's own equalizing addon/s etc. So I was just wondering if this > http://www.equalify.me/
< would be of some use to anyone. It's only a few weeks out of beta and I must say it's definitely made a big difference to my pair of tinny sounding desktop speakers when listening to the occasional bit of music.