How important is it for you to attain a holographic image?

Peterprvk, Re the Hafler loop - I agree that this can have  a very pleasant encompassing effect. I believe that it really is not much more than reproducing out of phase sounds  thru separate speakers using the same amp as used in the front speakers but you need a separate attenuator  to get the right volume level (came in Hafler's box). Its simple and as far as I'm concerned, while not as sophisticated as most multichannel systems, it is effective and you don't have nearly the set up issues. For other reasons I chose to use only 2 channel systems, mainly because I'm not inclined to fiddle with placement and volume issues every time I put on a recording and more inclined to just listen to the music not the effects.

Interestingly Carver had a shot at holography which I tried out back in the day. The first thing I noticed, and it blew me away, was in a cut when the audience applauded a performance it placed you in the audience, as opposed to hearing all of the applause in front you. But it really became more of a distraction than a benign additive and I lost interest. This black box I believe was doing nothing much more than playing with phase issues. 

One of the problems with max'ing out the soundstaging potential is when a recording is made, which includes all of the ambiance sounds in the recording environment, is that these sounds when reproduced thru your system can be in conflict (confused) by the ambiance in your room. For example if you have a recording with lots of ambiance and you play it in a bright room you are hearing neither of them any where near accurately. (Interestingly though, if you played a recording with all of the recording ambiance encoded and played it back in a 'dead acoustic' I think most folks would find it dead/dull as well. We have become quite adjusted, I think, to hearing the recording's ambiance when it is superimposed on the room acoustic  (we know our rooms that well). 

Anyway, that's all I know. :-)

Let's segway into a discussion of binaural recording and binaural sound reproduction.

Why? Mono Binaural is strictly for headphones. 

Peter_van_keuran:
Yes, I had that Dynaco adapter years ago.  It was very impressive with ambient sound filling from the rear speakers.

Prof,

Maybe you’ve never heard the type of holography I’m speaking of.  It’s not typical imaging, where the soloist is in front of rest of the rest of the forces as you would hear in real life.  It’s a disembodied sound, almost ghostly, hanging in front of the speakers.
 Some systems can create that effect.

No one wants a strange disembodied image. The goal is to be transported to the venue. . . Yes this is very much affected by sound engineers and the way they mic and mix the music. This is why you will find that recordings made and mixed by a person you like will give you more of the same. It is challenging to find sound engineers who are true artists at their craft and can deliver the dynamics we all look for and the imaging/staging that we want to hear. 

Binaural recording is one technique of many to record music by sound engineers using stereo pairs of microphones recording in a mannequin head so that the venue is recorded as it would be heard by a person sitting there. . . The playback has always been limited to headphones to hear the true 3D imaging of the music and environment. Huge strides have been made by Dr. Choueiri at his Prinston Lab to make this happen on our speakers.

Adding BACCH to my system is actually the next evolution of my stereo I am saving up for. The BACCH filters adjust in real time to eliminate comb filtering which is what ruins the 3D affect of true stereo reproduction and hearing the venue as if you were actually there. They have just offered the ability to execute it with a Mac mini. This is the next level in sound reproduction in my opinion and a very exciting time to be part of the audio world.