I always mix thru my Tannoy Reveal monitors and when happy with what I hear I listen thru various sources including AKG studio headphones, cheap koss headphones, a boom box and a stereo system in my studio that used Polk bookshelf speakers with a Onkyo powered sub...a little over kill but my mixes don't suprise me when played outside of my studio....I agree that one should never mix thru headphones, always try to use reference monitors or at least if using bookshelf speakers make sure the speakers are not in a corner and that your ears are at the right position to catch all of the sound...A little trial and error will help a lot here.......