Cerwin-Vega POWERED DESKTOP XD3 - Manual (Page 9)

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Placement
For the best listening experience, place the XD3 speaker system in the optimal
position. The left and right speakers should be placed at a vertical height
leveled with the main user’s head. The left and right speakers should be placed
so that it is in an equilateral triangle with the main user. An equilateral triangle
is where the distance between the left and rights speakers and the main user
are equal. The distance should be greater than 3 feet (1 meter). The rotation of
the left and right speaker should be at a 60 degree angle towards the main
user.