Specifications

APL-10, -12, and -SBs can also be combined in an L-format (See Figure 8).
The L-format exhibits directional control in both axes, and is often the best
choice for deploying a large number of speakers in sizeable venues.
Finally, APL-10, -12, and -SBs can be configured into a block arrangement (See
Figure 9).This arrangement also exhibits directional control in both axes, but
it does not take full advantage of the boundary surface effect (see "Using the
APL-10, -12, and -SB – 2-Placement" (pg. 21). Although this configuration is
certainly more effective than scattering the units about at random, it has a
tendency to produce unwanted lobing, sometimes leading to a muddy bass
response.
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Figure 8
Figure 9