2 Channel System - Image behind my head

I'd agree that the most likely cause of this effect is speaker phasing, but it's also possible that you are getting an acoustic anomaly in your listening room. Years ago, the audio club that I attended met in a local church that has an oddly shaped room with rather odd acoustics (probably due to room shape). The club's speakers were Acoustat 8's (electrostatics), and with certain recordings the left channel seemed to be coming from the left rear corner of the room. If you are only getting the "imaging from behind your head" phenomenon with this single recording, I'd attribute it to the a phasing problem on the recording. If it occurs with more than one recording, then you might try some room treatment, or slightly changing the position(s) of the speakers.

I only get it on this recording. I have also heard it somewhat on Dark side of the moon. My system is very simple, If it is out of phase, than it must be internal. Most recordings on my system have pinpoint imaging, so I tend to think it is recording specific.

their satanic majesties' request has a lot of similar effects, esp. 2000 man, in another land and gomper. i am pretty sure these effects were intentionally produced
in the studio.

I have a pair of Sonus Faber Extremas, and when set up right, they image behind you. Not every album but quite a bit. I have been told by many that it isnt possible but they fill the room with sound.

I have heard it in the show room where I bought them and three different rooms that I have had them set up in.