Specifications

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APL-10/12 speakers 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.
Figure 8
Finally, APL-10/12 speakers 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 – (2) Placement" (pg. 20). 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.
Figure 9