PMC IB1S-AIII, User Manual

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Positioning & Alignment
Attention should be paid to the effect of reflective surfaces such as side walls and objects in close
proximity to the loudspeakers, as excessive nearfield reflections will blur the stereo imaging significantly and
may introduce unwelcome colouration of the sound. Place the speakers so that their front baffles are well
forward of any objects placed between them, such as computer display screens.
With regard to vertical placement, the acoustic axis of the IB1S-A
III
is midway between the HF and MF
drivers. This axis should be level with the listener’s ears.
The highly flexible IB1S-A
III
is also available in a horizontal format identified as the IB1S-C-A
III
. This version
is ideal when low-profile solutions are required, either as a centre channel in 5.1 or 7.1 surround systems, or
in other height-restricted locations.
Optional, custom 33-inch (840mm) stands are available to raise the IB1S-A
III
above a mixing console or work desk (pictured).
Bass Response
IB1S-A
III
monitor loudspeakers can produce significant bass energy below
the frequencies at which they become omnidirectional. As a consequence,
it is important to consider the effect of the listening room’s boundaries when
placing the monitors.
Ideally, the monitors should be placed more than 0.5 metres from the side and
rear walls of the room so that reinforcement and cancellation (peaks and dips)
of the bass output caused by wall reflections will be moved higher in frequency
and thus become less influential. This reduces the incidence of ‘lumpy’ or
‘boomy’ bass. Small changes in position can have profound effects on the bass
response, so experiment to find the optimal position.