Need help: soundstage?

Look at Immediasound.com. They have a different perspective on setup. Might do wonders. I've tried both and liked Immedia's better...with 2 different speakers..

Setup is critical. Be sure to measure the speaker placement to a fraction of an inch. Also, a significant part of soundstage info, as opposed to imagining, is derived from low frequency hall reverb. If your speakers cannot produce deep bass, then you will not be able to obtain this effect. Regardless, most recorded music does not have the 3D soundstage you seek. Be sure that your reference listening music has this quality. Good luck!

The magic question. Speaker position is important, but by your measurements it sounds like your placement is pretty good. You can always fine tune placement. Bass is also important to round out images, especially in a large room. Your speakers should be able to fill a 12' x 15' room with some nice sound. The best imaging speakers have been, and are typically monitors. If imaging is a priority to you it seems we may be in the minority. What prompted me to respond was, "are the speakers not good enough to create 3D sound?". Better ($$$) products do not always provide better imaging. I have upgraded components and cables several times and in return for my money I get better dynamics, and sometimes more detail. But sometimes those products collapse the image and I am truly disappointed. More money is not always better when it comes to imaging. Buy components/speakers where the designers are concerned with imaging and not only will you be enjoying a magical system for many years, but in a few years you will own classic equipment instead of the latest, overpriced crap.