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The Mirror Test
The mirror trick works as follows: The listener is successively seated in each location of the room deemed to be a likely position for a listener. At each location, the listener observes a second participant move a mirror along the ceiling and walls of the room as well as any other suspect hard surfaces. When a loudspeaker can be seen in the mirror, the mirror is in a spot where sound waves can reflect from the surface to the listening position. These locations require absorption. After the placement of each absorber, an ETF impulse response measurement should be taken to verify the correct position of the absorber and to verify that the absorber is actually reducing the level of the reflection. If the absorber is not necessary, it should be removed.
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