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The center speaker must be placed a little behind the front left / right speaker. It should also be placed above or below the TV set and at the same distance as the front left and front right speakers. The height of the tweeter unit of the first three loudspeakers should be the same, and the distance between the front left and front right loudspeakers and the walls on both sides and the back wall should be the same. The surround speaker can be placed behind or on both sides of the listening position, slightly higher than the height of the human ear (of course, the height of the ear after you sit down). 

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When testing the sound, you can adjust the buttons slightly in the range of 20-20KHz.

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