Vandersteen 5A room placment options

Fjn,

I have just finished building a dedicated room which is somewhat similar to yours and have spent the last couple of weeks measuring room acoustics and experimenting with locations for my Vandy 5As. I chose to configure the room to the Fibonacci ratios (8H, 13W, 21L) since my research convinced me they are a very good approach to minimizing room modes. Assuming your ceiling is around 8H, you are within a foot or so of these ratios as well.

I found the best speaker location for both imaging and bass response to 5ft from the listener front wall and 3 ft from the side walls. Incidently, it turns out this also completes the Fibonacci ratio of 3, 5, 8, 13, 21. I have the listening chair 38% of the distance out from the listener rear wall. This puts the speakers 7 ft apart and about 9 ft from the listening chair. I have the speakers towed in to aim at the center of the listener rear wall. The good news is it has worked for me with great imaging and acoustic measures showing a very smooth bass response of +/- 5 db from 30hz to 200 hz.

If you feel like experimenting, and you don't have other room limitations not yet revealed, you might consider trying this approach. I would suggest you try 2.5 ft off the side walls as well to give as much separation between the speakers as possible (I have found the 5As seem to work best at around 8 ft in general, but couldn't quite get there in this current room. I also tried the 1/3rd, 1/5th and 1/7th placement method recommended by Richard V., but found the locations above to be noticably better for my room. Getting the speakers closer to the front wall also gave me more space behind my chair for media storage, a record cleaner, and some cabinets.

Thanks for all the helpful info. I did a bit of measuring, and these are the #'s. Room: L: 23'4" W: 12'4" H: 8 feet standard.
Speakers 36" or 3.0 feet from side walls (center driver). Speakers are spread apart 76" or 6' 4". Closer than I would like, but I found them to sound more open further from the sidewalls. However, I have never toed them in very much. Essentially, there is only a 2" difference from the front outer cabinet and the rear outer cabinet to the side wall . Obviously, the back of the cabinet is closer. I have them 95" or 34% out in to the room. I am seated a bit over 11 feet from the front plane, leaving just over 3 feet in back of my ears to the wall behind me. I have my records... in back of me, but on the long wall. Maybe I will play with a bit more toe in, or move a bit closer to the speakers. Zargon, just curious where your gear is situated.

Fjn,
The amp, pre and CD are centered, halfway between the speakers and the listener front wall. The phono pre and TT are to my right mid long wall. Media is on shelves across the rear wall.
I am also using some toe in - 3" from front to back of the speaker, which also aims the speakers at the center of the back wall. I am not a fan of toe in for the 5A, however, in a relatively narrow room, it helps reduce the first reflections. I am using diffusion on first reflections, but also interested in experimenting with diffusion.

Sorry, I meant:

"I am using absorption on first reflections, but am interested in experimenting with diffusion."

Just skimmed the preceding, and didn't see one mention of "ear height".

The 5A's are terribly sensitive to ear height and it is of equal importance to equidistance of each ear from the speakers.

The exact height is unknown to me, but Richard could tell you. In a mechancially stagered phase coherant system, an inch too high or low can make some difference