hi
make sure you update to latest firmware first, color is improved in those spar firmwares
here are links :
http://www.support.xerox.com/support/altalink-c8000-series/file-download/enus.html?&contentId=138063
http://www.support.xerox.com/support/altalink-c8000-series/file-download/enus.html?&contentId=138062
http://www.support.xerox.com/support/altalink-c8000-series/file-download/enus.html?&contentId=138060