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I.M. Distortion wrote :

"...From were you set put a ladder tye a string to it were your head was 15 feet long, go to your horns that is 1000 hz and above put the string threw it go threw the back of it take your driver off measure to the back plate distance from mounting front add that to the string and put some tape on it. Make sure the string is threw the center of horn, Then repete on all horns the same way on both sides, then it will be time aligned..."

I offer the following translation (?) because the English used may be making things a bit cryptic (no criticism intended... I make plenty of errors when writing in foreign languages) I think what I.M. Distortion describes above is the physical enactment of Romy's illustration (a few posts back) showing the relationship of the listener to an arc described by the location of each membrane.
In other words, I think you are both illustrating the same concept... The string idea is a practical means of quickly getting things close; sure it will not be precise down to one one hundredth of a millimeter... That would be the next step. Anyway, here's my translation :

1) Place a step ladder in the listening position.

2) Attach a piece of string to a point on the ladder corresponding to the location of the listener's ears. 

3) Remove drivers from all horns responsible for producing frequencies above 1000 Hz.

4) Extend the free end of the string through the center of each of the above-mentioned horns, and mark the point on the string corresponding to the location of the membrane (where it would be located had the driver not been removed).

5) Position the above-mentioned horns such that the location of their respective membranes will be at the point marked on the string once the drivers are replaced.

I.M. Distortion wrote :

"...#1 from were you listen to system from you should be able to look down the throat of every horn in your system..."

Hmmm... I will soon be able to verify this for myself.

Peace boyz,

jd*

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