Speakers "Disappearing"

Keep in mind that even with the best speakers, placement, and recording, the speakers will "disappear" only in a listening sweet spot likely not to envelop more than 1-3 listening positions.

I had a pair of Martin Logans for a while.  They imaged very well when sitting with my head still, back straight, in one place on my couch.  If I moved or stood up, it sounded like a bag was put over my head.  

Since I could not strap myself in that position, I traded them for a pair of Dynaudio speakers that had a beautiful tone and could withstand severe volumes.  Trade-offs!

How do you find them once they disappear, and where do they go? I certainly don't want to get up in the middle of the night and trip over a speaker that reappears...

Frequently your speakers will disappear when you leave your doors unlocked.

Now that I got that out of my system, I have a very asymmetrical room and the width of my soundstage was very variable with different recordings. My system performed well with the Chesky Ultimate Demonstration Disc Vol. 2 (love that deep bass track); but not every disc or LP sounded as good. On a whim I ordered The IsoTek Ultimate System Set-Up Disc, from Music Direct if I recall. This is the only disc I’ve found that has a series of tracks that first guide one to get the channels balanced, then optimize the width of the soundstage, then the depth, then the three dimensional realism. It made a big difference in my system in my room, not just refining my speaker and listening chair replacement; but rearranging furniture and objects in the room.

Disclaimer: not in anyway affiliated. I have posted this in other threads as relevant. If you've read it before, bear with me.