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RE: That is the number I came up with as well...

Unfortunately the Audio Physic setup documents on Immedia's site aren't all that precise on some things. They say that most people prefer a 72 degree angle, talk about placement at the focal point of an ellipse which all 4 walls contact tangentially, and use a grid which shows placement at quarter and three quarter width points. There's no guarantee that the focal points will give a 72 degree placement with the listening position—that angle will be determined by room dimensions if you use the focal points. As I said previously, I use the quarter and three quarter points and that gives roughly a 66 degree angle in my room—the angle here is also going to be determined by your room dimensions. I have tried the focal point placement and found it too far apart in my room. I haven't worked out what the angle was there but it would have been less than 90 degrees. 90 degrees is going to be a very wide placement and I would think you would run into problems.

You asked:

"The 78" I referenced was measured from my listening position to the front of the plane at the mid-point between the speakers, not the distance from the listening position to the tweeter. Is this the correct measurement?"

Yes, from the speaker plane to the listening position


"Now the last question. According to Robert Greene the Spendors should be placed 90 degrees apart, from the listener's viewpoint. Does this equate to Tan45 degrees?"

Yes, but the Tan of 45 degrees is 1 so the calculation gets very easy. What you want is a speaker to speaker distance that is exactly twice the speaker plane to listening position distance in order to get the 90 degree angle.




David Aiken

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