About the Sonic Holography....
To those of you who say you get a slightly wider sound stage, or you prefer to not use the DSP surround modes....
You're not getting it. By that I'm NOT
saying you are clueless. I'm saying you are not receiving the effect of sonic holography.
When you get it, it's *not* subtle. It's an epiphany. And it's not a slightly wider sound stage. It's a 3 dimensional one that you can precisely locate the instruments, a sound stage that is front to back, not just wider.
If you *think* you are getting the illusion, you don't have it. You know
it when you have it.
What's the problem with it? The problem is 0% of the people who say they have tried it will ever rearrange the position of their home theater speakers as is required to produce the effect. Activating the sonic holography mode you can hear a processing difference even if the speakers are set up wrong. Different processing, yes, from anywhere...but not 3D holography.
The speakers need to be away from the walls, 3-5 feet from the side walls, and 3-5 feet in front of the rear wall, at ear level. The distance from each speaker to the listening position has to be within 1/4 inch, and 1/8 is better. C'mon, you know you haven't done this, so spare me the skepticism. Speakers closer together work better than wider apart.
The listener does not have to be centered to the same degree as the measurement above, but the distance from the listener to the speakers again...1/4 inch.
I do not have a Sunfire Theater Grand III. But sonic holography is the reason why it is on my short list of pre-pros. I do have a 15 year old Carver C1 stereo preamp with sonic holography.
Like most of you, I thought it was a gimmick when I first tried it. Switched it on a few times, thought I heard something different, nothing major. Only after reading the theory, the analogy to laser interferometry to produce 3D holographic visual images, the concept of coherent beams, constructive/destructive interference.
I built an entire live end/dead end sound room around the concept of canceling the near reflections from side walls, rear walls using fabric covered, rigid architectural fiberglass panels. You don't have to go to that trouble to achieve an impressive, satisfying effect. But you do have to carefully align, measure the speaker distance to the listener within 1/8-1/4 inch.
I had but (2) front stereo speakers. I'd demo the sonic holography, and people would start looking around, move their head from side to side, front to back, sit up, stand up, and usually end up asking where the other speakers were.