Sony STR-DN1040 - Manual (Page 25)

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7.1 channel speaker system
using front high speakers
You can enjoy vertical sound effects by
connecting additional two front high
speakers.
Place the front high speakers
– at an angle between 25° to 35°.
– at an angle of 20° ± 5° in height.
Since the subwoofer does not emit highly
directional signals, you can place it wherever you
want.
Tip
20 ˚ ± 5˚