Holographic speaker placement

[nat8808]

I'm sure it's been talked about before but I wanted to post a link up to this AES paper about speaker placement for holographic imaging.

Sorry, that should be Phantom Source Imaging:

http://www.essex.ac.uk/csee/research/audio_lab/malcolmspubdocs/C78%20Loudspeaker%20placement.pdf

and then it's talked about in Stereophile in an Audio Physic Virgo 2 review as Joachim Gerhard, the designer of the Virgos, was involved in the research paper.

Cinerama Setup (http://www.stereophile.com/content/audio-physic-virgo-loudspeaker-page-5)

Would love to try it out soon - needs a room re-configuration.

[Mr Kipling]

I remember in the early '80s trying an unusual speaker placement in my bedroom and freaking out at hearing a palpable rock-solid central image of Gladys Knight with The Pips, 1, 2, 3, of them, in a lateral plane to the right of her with my Castle Richmonds. I'd never heard anything like it before.

[mikeba316]

Backwards

[nat8808]

Backwards

?

[Covenant]

This looks like the proposal is to move the speakers away from the wall into the middle of the room, impractical for most people.

[icehockeyboy]

Once, after I had my PMC's made into + versions, I too had an amazing holographic effect, with certain instruments seemingly coming from behind where I was sitting.

It turns out I had somehow put plus into minus on the binding posts, and experienced them " out of phase" which sadly disappeared when I sorted it!

[Ali Tait]

It would only be out of phase if it was one speaker. If both were reversed it would be fine.

[RMutt]

I followed this guide to place my speakers. It seems to be very similar. http://www.magicgardenmastering.com/SpeakerSetUp.pdf

[nat8808]

This looks like the proposal is to move the speakers away from the wall into the middle of the room, impractical for most people.

Yes.. I think other's who use the living room will have to just get used to it!

I've a T - shaped room so don't know if that effects things but might try something similar in terms of moving things away from the walls drasticly to see what happens.

[nat8808]

I followed this guide to place my speakers. It seems to be very similar. http://www.magicgardenmastering.com/SpeakerSetUp.pdf

Does look like the same thing.

The Stereophile article that talks about the set up makes it sound very laborious in terms of getting it right.

[Covenant]

I have one of my speakers positioned between a wall and door opening-its only about 100mm off the wall, it's not ideal and I get bass boom. The article has made me think how I could improve things. I will try moving the speakers but wont be able to get them in the middle of the room like the article suggests.

[icehockeyboy]

It would only be out of phase if it was one speaker. If both were reversed it would be fine.
I know......... :eyebrows:

[Mr Kipling]

Here's the other thread, Jerry.

When I wrote to Hi Fi Answers more than three decades ago about it and then a decade later to 'World, no-one took me seriously.

What I really meant to before was that there is 4 possible listening positions depending upon your particular domestic settings. Basically, your speakers, listening position and central image point form the 4 corners of a square and you can rotate the speakers round the 4 points. You get some variations due to room boundries.

The really, really, really weird thing about it was that when listening I used to get this fluttering sensation at the back of my head. It was as if my brain was trying to lock-on to the 3-D imagery, but there wasn't quite enough data . The most weird audio experience I've ever had! I'd urge every one to give it a try. What have you got to lose?

[Covenant]

Cheers Stephen,
Moving my speakers either side of a corner has made a significant improvement to the soundstage. The image is no longer constrained by the speakers and has a much better sense of depth.
Not sure what the wife will say when she pops her head in though.......

[Mr Kipling]

I used to get acres of depth with central images projected well forward. The biggest thing for me was the sound and images gave no impression of eminating from the speakers. It made more impact on me than any item of equipment I had at the time.

[Mr Kipling]

Forgot to mention that at times the depth plane appeared to extend beyond the confines of my bedroom walls to outside. Quite a neat trick from just a modest pair of Castle Richmonds.