JBL STX828S.v6

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STX828S

Dual 18" High Power
Subwoofer

Professional Series

Key Features:

䉴 Premium passive loudspeaker
system
䉴 Very high power handling
䉴 Dual 18 inch, 2242H Super Vented
Gap Cooled™ woofers for extended
low-frequency output and extremely
low distortion
䉴 Large vent area for reduced
distortion

Applications

䉴 Live performance venues
䉴 Mobile and fixed DJ systems
䉴 Sound system rental
The STX828S is a high power
subwoofer system containing two
2242H patented Super Vented Gap
Cooled™ 18" woofers in a frontloaded, vented enclosure. The
enclosure is designed to present a
minimum frontal area. The system
offers complete input connection
flexibility for compatibility with a
variety of cabling schemes. A recessed,
external switch allows selection of
either contacts +1/-1 or +2/-2. By
relocating an internal connector, it is
also possible to drive each woofer
discretely from a separate amplifier
channel.
The enclosure is constructed of top
quality birch/poplar laminate plywood
and coated in JBL’s rugged DuraFlex™
finish. Each woofer is housed in an
isolated chamber and the enclosure is
heavily braced to maximize lowfrequency performance. The attractive
CNC-machined, 14-gauge steel grille is
internally lined with acoustically
transparent cloth to provide additional
driver protection and give a very
professional appearance.

Specifications:
Frequency Range (-10 dB): 32 Hz – 250 Hz
Frequency Response (±3 dB): 37 Hz – 120 Hz
Input Connection Modes: Switchable, +1/-1 or +2/-2
Internally selectable, Parallel or Discrete
Recommended Crossover Frequencies: 30 Hz, 24 dB / octave HPF
80 Hz, 24 dB / octave LPF
Power Rating
(Continuous1 / Program / Peak): Parallel: 2000 W / 4000 W / 8000 W
Maximum SPL2: 138 dB SPL peak
Sensitivity (1w @ 1m): 99 dB SPL
LF Driver: 2 x JBL 2242H 457 mm (18 in) Super Vented Gap
Cooled™ woofers
Nominal Impedance: Parallel: 4 ohms
Discrete: 8 ohms x 2
Active Tunings: Designed for Crown amplifiers and dbx DriveRack.
Settings available at www.jblpro.com
Enclosure: Rectangular, 18 mm, 13-ply birch/poplar plywood
Transport: 4 side handles, 4 side grip points
Finish: Black DuraFlex finish
Grille: Powder coated, black, 14-gauge perforated steel with
acoustical transparent cloth backing. Removable JBL
badge and punched JBL logo.
Input Connectors: Neutrik® Speakon® NL-4 (x2)
Dimensions (H x W x D): 564 mm x 1137 mm x 714 mm
(22.2 in x 44.8 in x 28.1 in)
Net Weight: 82 kg (180 lb)
Optional Accessories: For covers, go to www.jblbags.com
40 Hz to 120 kHz pink noise with 6 dB crest factor, 2 hours duration.
Calculated based on power rating and sensitivity.

1
2

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.

䉴 STX828S Dual 18" High Power Subwoofer
Block Diagram

Frequency Response
110

JBL PROFESSIONAL
Northridge, CA USA
Designed in the USA
Made in Mexico

Serial No.

STX828S

+

NL4 ±1

N108

NL4
IN / THRU

IN / THRU

NL4 ±2

2+

100

LOW
FREQ 1

-

SPL (dB)

1-

PARALLEL
CONNECTOR

1+

90
2␲ half space
4␲ free field

2-

80

+
1+

1NL4
IN / THRU

NL4 ±1

2+

INPUT: 4Ω

LOW
FREQ 2

-

70
20

DISCRETE

TO DRIVE EACH WOOFER WITH A SEPARATE
AMP CHANNEL, REMOVE INPUT PLATE,
REPOSITION CONNECTOR

100

1000

10000

20000

Frequency (Hz)

2INTERNAL
CONNECTORS

NL4 ±2

STX800
®

Equipped with Differential Drive Transducer
Technology U.S. PATENTS: 5,042,072

Dimensions
100°

712.7
28.1

992.5
39.1

31.8
R1.3

1138.2
44.8

568.6
22.4

563.6
22.2

405.0
15.9

281.8
11.1

226.4
8.9

295.4
11.6

203.2
8.0

276.9
10.9
311.6
12.3

126.5
5.0

Dimensions in mm (in)

JBL Professional
8500 Balboa Boulevard, P.O. Box 2200
Northridge, California 91329 U.S.A.
© Copyright 2012 JBL Professional
www.jblpro.com

SS STX828S
CRP
06/12 A



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