PMC PMC6 User Manual page 24

Initial positioning of the loudspeakers should be 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 definition will
be impaired. Use a well recorded vocal track to judge the ideal placement.
Surround & Immersive Systems
Our professional active monitors can be mixed and matched completely
seamlessly as their tonal characteristics and dispersion are identical — the
only difference between them is their cabinet size, bass extension and SPL
capability. Our monitors are designed to provide ultra-wide dispersion to
create a unified sound field, allowing individual sounds to be placed and
adjusted within the soundstage with complete precision.
PMC monitors exceed the specification requirements for the Dolby Atmos
format, and our experience with such systems is unparalleled, supporting
our users to push the boundaries of creative audio production.
For surround or immersive formats, we recommend that all speakers are
aimed directly at the listening position, to ensure consistent balance and
focus across the whole sound field.
Most surround and immersive sound systems employ bass-management
for the surround and height channels, crossing-over the lower frequencies
to one or more subwoofers. In this context PMC monitors have a distinct
advantage over other designs in that our unique ATL ™ bass-loading
technology provides a gentler low-order LF roll-off than conventional ported
cabinets. This allows a smoother, seamless integration between the height
and surround channels and the subwoofers.