American Acoustic Development M Series - Manual (Page 5)

When choosing a dedicated listening room, try to avoid rooms with equal distance
on all four sides, or rooms with length exactly twice as long as width. Geometry as
such will increase the echoing effect and increase coloration.
If possible, place seating in between the two walls where rear speakers are mounted.
The closer speakers are to corners of wall, ceiling and floor, the larger volume of
bass will be heard. However, sometimes bass can be overloaded.
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Power Switch on/off
Upper position: power on
Lower position: power off
Volume Control
Use this control to balance the level of the subwoofer with the level of your main
speakers.
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