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CHAPTER 4
and subwoofers (not in the MAPP Online predictions).
Equalizers for each zone, as well as digital delays, provide a
time adjustment to compensate for the various sub-systems
if they are geometrically out of plane.
CAUTION:
This example is not meant to
!
be used as a template for your own system
designs. Acoustical characteristics, physical
constraints, audio content, audience, and other
relevant factors should always be uniquely weighed
into your own applications on a per-project basis.
USING MILO WITH SUBWOOFERS
A MILO system will provide full bandwidth frequency
response down to 60 Hz. The height of the array (number
of cabinets) will determine the total SPL available and how
much low frequency energy can be provided, proportional
to the upper-frequency spectrum.
If higher SPL is necessary, or the program content requires
additional low-frequency energy (e.g. the reinforcement
of popular music), then subwoofers should be used to
augment your MILO loudspeaker array(s).
Meyer Sound subwoofers, such as the M3D-Sub or 650-P,
can achieve frequency response down in the 30 Hz range,
extending the system response appreciably and increasing
the acoustic power of the system in the lowest frequencies.
In addition, the use of high-pass filters to drive a MILO
system with subwoofers increases the headroom of the
MILO array in the lowest end of its usable spectrum.
The ideal ratio of MILO loudspeakers to subwoofers
depends on the configuration of the array and the frequency
content of the signal being reproduced by the system.
For most applications, two MILO loudspeakers for each
subwoofer yields good results in frequency response and
headroom.
NOTE:
The limit LEDs indicate when the safe
power level is exceeded. If the subwoofers
used in the system begin to limit before reaching the
required SPL at low frequencies, consider adding
more subwoofers to satisfy the SPL requirements
without exposing the drivers to excessive heat and/
or excursion.
MILO and the M3D-Sub
The M3D-Sub directional subwoofer, shown in Figure 5.5,
adds substantial low-frequency headroom to a MILO array,
extending the system frequency response to 30 Hz.
18
Figure 4.4: The M3D-Sub loudspeaker
The M3D-Sub has advantages over other subwoofers due
to its unique low-frequency directional control and its ability
to be vertically arrayed with MILO since they share the
same width.
NOTE:
For most applications, you want to
keep low frequencies from being produced
behind the array, in order to reduce or eliminate
the low frequency reverberant noise traditionally
associated with large-scale, full range loudspeaker
arrays. The M3D-Sub's award-winning and patent-
pending cardioid directional pattern provides
maximum cancellation from six to twelve meters
behind the cabinet (-20 dB at 8 meters).
All Meyer Sound products have been optimized with
internal crossover networks. When most Meyer Sound
loudspeakers are used together, these networks provide
maximum power addition through their respective
overlapping frequency ranges when used in close proximity
and co-planar to one another. The MILO and M3D-Sub can
accommodate several basic connection options, discussed
in the following sections.
Daisy-Chained
When MILO loudspeakers and M3D-Subs are daisy-chained
using the loop feature on the user panel, the result is a
smooth frequency response through the "overlap range" of
60 Hz to 100 Hz when M3D-Subs and MILO are co-planar
at a ratio of two MILO loudspeakers to each M3D-Sub.
M3D-Sub and MILO loudspeakers should be placed
as close as possible to each other so that the relative
distances between them are the same at all listening
positions. Due to the relative phase responses through the
overlap range, M3D-Subs should not be placed farther back
than MILO loudspeakers. However, an M3D-Sub array can
be placed up to 4 feet in front of MILO loudspeaker array
and remain in phase.
If MILO loudspeakers and M3D-Subs are flown side-by-
side, there should not be more than 3 feet between them.
In addition, the M3D-Subs are better suited to the inside
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