PMC result6 - Advanced Placement Strategies; Room Acoustics and Placement Geometry

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When initially positioning the loudspeakers, they should ideally be located at two of the three
points of an equilateral triangle, with the listener at the third. If the monitors are spaced too far
apart the stereo image will be wide but central denition will be impaired. Use a well recorded
vocal track to judge the ideal placement.
Attention should be paid to the effect of reective surfaces such as side walls and objects in
close proximity to the loudspeakers, such as computer screens. Excessive neareld reections from
these kinds of objects will blur the stereo imaging signicantly, and may introduce unwelcome
colouration of the sound.
Place the speakers so that their front bafes are well forward of any objects placed between
them, such as computer display screens.
With regard to optimising the speaker height, the acoustic axis of all your result6 cabinets is midway
between the HF and LF drivers. This axis should be level with the listener’s ears.
To prevent vertical room modes from causing boominess, do not position the speaker such that
the bass driver is at an even proportion of the room height, such as a half or a quarter.
Positioning (cont.)
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Acoustic axis