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Discussion Starter #41
Great questions, you are stretching the limits of my memory banks.

I will follow with a post tomorrow (Wednesday) with answers. The promised follow-up is in process at this time, a complete rewrite of my Speaker Setup Guide. My goal is to publish it in April. It will contain a lot of detail, including theory.
 

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Discussion Starter #42
I could not find any measurements about dimensions for speaker placement.
Terrific questions all. I will try to fill in some blanks, but some of your answers might have to wait for my rewritten setup guide, in the works. Hopefully done in the next few months.

Final Placement:
43 in = LP to speaker plane (plane that runs from center to center of the speakers)
67 in = spkr to spkr
64 in = spkr plane to front wall

I am not familiar with the term Sharp Reflections, what do you mean by this? Are these early reflections?
Yes, controlled early reflections "tuned" to be constructive to soundstage development.

Example 3 suggest taht placing the speakers close to the side walls could work. Have you tried this?
I have not. Room symmetry does not allow this in my listening area. Also, the angle of the side reflection is critical and side walls might not support that precise angle.

Example 4 doesn't make much sense since there are no (Sharp) reflections point in the direct path between speaker and LP. You mentioned a follow up post about using the slats. Have you been able to post that?
The vertical panel on the right of the diagram is the source of the sharp reflection.

I am working on a complete rewrite of my setup guide. Other than that, no, sorry.

With example 3 you mentioned later on in the article that this setup produces big variations with small differences in placement. Could you not compensate that by changing the angle of the reflection panel?
Yes, in fact that is precisely what I do now. The next version of the setup guide will show this. Again, sorry.

You speak about pitch and roll in the article but roll would suggest turning the speaker around the front to back axis.
Correct. I have to pay attention to that in my listening laboratory because of a slightly uneven concrete basement floor (100% covered by carpet in the listening area). Speaker heights do not match, nor do other speaker setup parameters, without measurements and careful compensation. I nave custom DIY stands which are used to compensate for all of these variables.

From all article that I have read about Martin Logan speaker I have found this one the most informative and the sound stage that I am chasing after myself, but my room is pretty narrow only 133in in width while ML recommend placing the speakers 96in-108in apart and at least 24inch from the side walls.
My only suggestion is to refer to the ratios in the current setup guide, which has served us pretty well so far.
 
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