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RE: Oops...

The reason for using the tangent of 36 degrees is because we're dealing with 2 sides of the right angled triangle that connects 1 speaker, the listener, and the mid-point of a line drawn between the speakers. The side of that triangle connecting the mid-point of the line between the speakers to the listener bisects the 72 degree angle so you've got 36 degrees on either side of that line.

The tan of 36 degrees is 0.726. The distance from the speaker plane to the listener is 78" so the distance from the speaker to the midpoint will be 56" (78" x 0.726) and that makes the total distance between the speakers 112".

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I haven't got any experience with Spendors but I do have my Dynaudio Contour 1.3 SEs pointed directly at me. If the on axis response is flat there shouldn't be a problem and it may actually help. Pointing the speakers directly at the listener means that the early reflections are going to come from a fair degree off axis. Since the top end usually rolls off some as you move off axis, that takes some of the energy out of the early reflection. The early reflection would still be off axis if the speakers were pointed straight ahead (no toe in) but they become more off axis as you increase the toe in by angling the speakers more towards the listener. Different speaker designers have different views on what the most desirable listening axis is, and your views don't necessarily have to coincide with those of the designer. In my view toe in is something that you adjust to suit your ears and the room.


David Aiken

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