-12-
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.
Planar Array Frames and Rigging Brackets
Planar Array Frames (PAFs) provide a pre-engineered solution to rig many of the arrays
found in this guide. Please refer to the
AE Series Bracket and Array Frame Handbook
for
more details.
When tilting an array that utilizes a PAF frame downward at angles greater than about 35
degrees, understand that the center section of the array will end up with more down-tilt
than the outside sections. If this is undesirable, consider changing the rigging to a
spherical array, where each box is aimed down independently. Spherical arrays can
require more complex rigging, but have the benefit of independent adjustment of
speakers on each axis.
Often the top tier of a multi-tiered array is aimed downward together at a shallower angle
and the downfill boxes are aimed independently below that. This is how the two-tiered
arrays in this guide are shown.
MORE INFORMATION
For more information on designing loudspeaker system arrays, refer to
JBL Audio Engineering
for Sound Reinforcement
by John Eargle and Chris Foreman
(Hal Leonard Publications, 2002)
Additional system design information, including advanced design concepts, can be found at the
"Technical Library” available on the JBL Professional’s website.
Information on amplifier recommendations found in this guide can be obtained at the Crown
website:
http://www.crownaudio.com/
Information on DSP hardware recommendations found in this guide can be obtained at the BSS
Audio, Crown and dBX websites. All websites are accessible from:
http://jblpro.com/
.
