A deeper more holographic soundstage.

Hi, thanks for an interesting discussion.

My hifi equipment is now at such quality level (but by no means exclusive/very expensive) that decent cabling makes a difference. I have just changed all power cords ensuring all are plugged-in correctly phase-wise, and deployed a cheap power filter/conditioner. The difference is audible giving me more punch and holographic sound image.  

That said, I have already perfected speaker placement using quite a few different methods. One of the most educational was "The Art of Rational Speaker Placement" found here https://youtu.be/84Pf0ycbyBM. I even contacted the presenter, and bought his written guide.

Since then, I have diverged from this speaker placement, but following his process gave me insight into what is possible with speaker placement. Especially, careful backward-tilting of the speakers mentioned in the end of the video and guide, is the icing on the cake: it opens up the stereo image submerging the listener into the sound.

Maybe, careful tilting could give you the extra depth and height in your stereo image. 

The short answer is to move your chair closer to the speakers. Measure from tweeter to tweeter, multiply it by 0.83, and use that number to determine the optimal distance from the right tweeter to your right ear. (Jim Smith’s method, it works)

The longer answer involves optimal ear height (often a foot or so higher than the tweeters on two-ways, easy to check), optimal speaker distance from the rear and side walls (different depending on speaker type and room layout, and much harder to get right), and not using that questionable super-toe-in method that’s become popular for reasons that escape me.

It’s also worth bearing in mind that if the room has no opening to release pressure the long bass frequencies will create a mess of reflected sound and the midrange will suffer, which is where the holographic magic happens.