Specifications

3) Loudspeaker Array Low-Frequency Pattern Control using Filtered Array
Technology
 ; JBL Professional Application Note.
4) JBL Audio Engineering for Sound Reinforcement by John Eargle and Chris
Foreman (Hal Leonard Publications, 2002).
These papers describe some of the most popular and effective low-frequency arraying
techniques for performance systems including:
 Frequency-shaded or Bipole arrays
 Gradient or Cardiod arrays
 Filtered Array Technology (FAT) arrays
 Forward Steered arrays
Each of these arrays may be realized using product from the AE and PD series of
loudspeakers. For additional information on the use of these arrays please contact the
JBL Application Support staff.
Subwoofer Directional Control
Configuring subwoofer enclosures in vertical columns or spaced vertical arrays, as with
any line source, will allow the user to achieve vertical pattern control to a lower
frequency. The AE Series subwoofers can easily be used in such configurations with
ample 10mm attachment points. A more common configuration for practical low
frequency control, however, is to use multiple subwoofer enclosures in a cardioid
configuration.
Cardioid subwoofer arrays will typically exhibit 10-20dB of rear attenuation to better
control subwoofer energy onto stage areas or boundary areas. The beneficial effects are
tighter, more controlled subwoofer impact to the audience areas due to higher direct to
reverberant ratios and less energy interacting with boundary conditions (walls).
Figure 7: ASB6112 enclosures
configured in a cardioid
configuration.
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