JBL PD-128 Brochure
PD128
High Output Dual 18"
Subwoofer Array Module
Key Features:
FSA™ Forward Steered Array
enclosure configuration for
optimum acoustic performance in
arrays of three or more modules
Up to 12 dB of rear rejection at 60
Hz and 90° of beam steering
capability in typical six module
array
Usable LF reinforcement to 26 Hz
2242H 18" SVG (Super Vented
Gap™) Transducers
Available suspension truss
components make array building
simple and cost effective
The PD128 Precision Directivity™
loudspeaker is a high power subwoofer module designed for use in
arrays and in conjunction with other
PD series systems to construct fullrange systems.
A key advantage of FSA systems is
the ability to project a single welldefined energy “lobe” into the audience area. The combination of even
response in the seating area and high
off-axis attenuation substantially
increases the quality of low-frequency reproduction by maximizing the
ratio of direct-to-reverberant sound.
FSA arrays are based on end-fired
array principles. In an end-fired configuration, the length of the array
determines its useful low-frequency
directivity and the spacing of the elements determines the frequency at
which beaming occurs. FSA technology improves upon the useful characteristics of the traditional end-fired
system through a combination of
physically expanding the line array
into a three-dimensional array and
controlling directivity via the use of
digital signal processing. Multichannel signal processing with
amplitude and delay capability and
multi-channel amplification is
required for implementing FSA array
steering. Contact JBL Professional for
application details.
The PD128 employs the 2242H 18"
transducer, one of JBL’s family of
Super Vented Gap woofers, to deliver
excellent low frequency extension
with minimal power compression and
low distortion. Large vent area
assures minimal port compression
and low distortion at high levels.
Each transducer is mounted in a separate vented subchamber.
For outdoor applications, several levels of weather resistance are avail-
able. Please contact your sales representative or JBL for further information.
Preliminary Specifications:
System:
Frequency Range (-10 dB): 26 Hz - 2.3 kHz
Frequency Response (±3 dB): 34 Hz - 1.4 kHz
Recommended High Pass: 25 Hz, 12 dB/Octave
Recommended Low Pass: 100 Hz, 48 dB/Octave
Input Power Rating: 1600 W AES; 6400 W Peak; parallel wiring
(100 hour test duration) (2 x 800 W AES; 3200 W Peak; independent wiring)
Sensitivity1(30 Hz - 100 Hz): 99 dB SPL, 1W @ 1m (3.3 ft)
Calculated Max. SPL
(30 Hz - 100 Hz): 131 dB Continuous, 137 dB Peak SPL @ 1m (3.3 ft)
Nominal Impedance: 4 Ohms (2 x 8 Ohms)
Signal Processing: DSP with amplitude and delay capability required.
Contact JBL for application details.
Transducers:
Low Frequency: 2 x 2242H, 460 mm (18 in) dia., 100 mm (4 in) edgewound
ribbon voice coil
Physical:
Enclosure: Vertically trapezoidal, 30° included angle; 18 mm birch
plywood, extensively braced
Suspension Attachment: 16 points; 4 each top, bottom & sides; accept M10 threaded
hardware
Finish: Black DuraFlex™ coating
(white or custom color optional)
Grille: Black powder coated zinc treated 16 gauge perforated steel
grille with foam backing (white or custom color optional)
Input Connector: 2 x NL4 Neutrik Speakon connector; each driver wired
independently; parallel or separate wiring user selectable via
internal jumper, input located on side of enclosure
Dimensions (H x W x D): 21.7 in x 66 in x 34 in
551 mm x 1676 mm x 864 mm
Net Weight: 229 lb, 104.2 kg
1 Sensitivity is based on a swept test signal with an input of 1 Watt at rated impedance, measured in half-space.
JBL continually engages in research related to product improvement. Some materials, production methods and design
refinements are introduced into existing products without notice as a routine expression of that philosophy. For this reason, any current JBL product may differ in some respect from its published description, but will always equal or exceed
the original design specifications unless otherwise stated.
JBL Professional
8500 Balboa Boulevard, P.O. Box 2200
Northridge, California 91329 U.S.A.
© Copyright 2000 JBL Professional
A Harman International Company
SS PD128
CRP 15M
8/01
PD128 High Output Dual 18" Subwoofer Array Module
Dimensions
Typical Six-Box Array
Rear
Top
Side
Side Front
34
(864)
66
(1676)
15°
36
(92)
21.7
(551)
86.2
(2188)
Rear Side Front Side
34
(864)
66
(1676)
Truss
Module
Dimensions in inches (mm)
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