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Old 14th August 2019
  #10
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We typically stick to the 30° equilateral setup while designing. With good speakers, it's going to be the optimal setup in terms of perception of stereo, phantom center image and depth in 100% of the cases.

Now due to e.g. the space between our ears, we recommend the engineers sit a bit forward from the triangle tip, usually 30cm forward, which provides the best representation of stereo and optimizes the sweet spot area. We account for this in the design.

You get "out of field stereo" width, yet with a lot of depth and a strong phantom center and everything in-between: you can pin point every source precisely, even out of field info.

It's also impossible to fool around with angling speakers once they're in-wall, and since we only work in-wall... Question answered. Same when you work quasi-flush mount (speakers stuck against the front wall) where the objective is to keep the front wall/speaker relationship as close to minimum phase as possible. Having a differential between the angle of the front wall and the speakers, even of only 5°, degrades the response immediately audibly and on measurements.

I did notice that angling the speakers away from 30° (reducing the angle) tends to degrade the stereo and center relationship - creating more of a strict "LCR" image with little info in-between and damages the depth a lot.

Angling the speakers further (augmenting the angle) also creates more of a "LCR" image and the center tends to collapse, headphone style.

YMMV.