Yes, absolutely. Try binaural music. Then speakers are the ones getting the spatial info and cues incorrect. 'Detail' and 'Soundstage' are two quite different things. At the same volume level? You must either have had a really crappy headphone rig (which I doubt), or...I don't know. That's the only explanation I can think of. I have had the exact opposite occur -- I hear the new things on headphones, not speaker systems. And I've heard some pretty nice speaker systems (probably the high-point of my speaker listening was having the Dynaudio Special 25's driven by Musical Fidelity A300^CR, MF A308 CD player, and I forget what pre I was using. It did sound sweet, and I did hear things to a great level of detail, but I don't remember hearing anything new. Equivalent at best. And I think I tended to listen louder on speakers (which should overcome my "background noise" argument). Just because they sounded so good loud.