Professional Series

STX818S 18" High Power

Subwoofer

Key Features:
䉴 Premium passive loudspeaker
system
䉴 Very high power handling
䉴 18 inch, 2242H - Super Vented Gap
Cooled™ woofer for extended low-
frequency output and extremely low
distortion
䉴 Large port area for reduced
distortion
䉴 20 mm threaded pole socket for
solid, secure satellite speaker
mounting

Applications
䉴 Live performance venues Shown with optional
䉴 Mobile and fixed DJ systems SS4-BK pole and
STX815M
䉴 Sound system rental

The STX818S is a compact, high

power subwoofer system containing a
Specifications:
2242H patented Super Vented Gap System Type: 18" bass-reflex subwoofer
Cooled™ 18" woofer in a front-loaded, Frequency Range (-10 dB): 35 Hz – 250 Hz
vented enclosure. The enclosure is Frequency Response (±3 dB): 40 Hz – 120 Hz
Input Connection Modes: Switchable, +1/-1 or +2/-2
designed to present a minimum frontal
Recommended Crossover Frequencies: 30 Hz, 24 dB / octave HPF
area. The system offers complete input 80 Hz, 24 dB / octave LPF
connection flexibility for compatibility Power Rating
with a variety of cabling schemes. A (Continuous1 / Program / Peak): 1000 W / 2000 W / 4000 W
recessed, external switch allows Maximum SPL2: 132 dB SPL peak
selection of either contacts +1/-1 or Sensitivity (1w @ 1m): 96 dB SPL
+2/-2. LF Driver: 1 x JBL 2242H 457 mm (18 in) Super Vented Gap
Cooled™ woofer
The STX818S is equipped with a Nominal Impedance: 8 ohms
top-mounted, threaded, 20 mm socket Active Tunings: Designed for Crown amplifiers and dbx DriveRack.
that can receive the optional SS4-BK Settings available at www.jblpro.com
pole. This adjustable height pole can Mounting: Top mounted M20 threaded socket for optional SS4-
be used to mount speakers equipped BK pole
with standard 35 mm pole sockets and Enclosure: Rectangular, 18 mm, 13-ply birch/poplar laminate
weighing up to 50 kg (100 lb). The plywood
Transport: 4 side handles, bottom mounting points for optional
threaded socket minimizes buzzing casters
and rattling and assures that the pole Finish: Black DuraFlex finish
will be secure and straight. Grille: Powder coated, black, 14-gauge perforated steel with
The enclosure is constructed of top acoustical transparent cloth backing. Removable JBL
badge and punched JBL logo.
quality birch/poplar laminate plywood,
Input Connectors: Neutrik® Speakon® NL-4 (x2)
coated in JBL’s rugged DuraFlex™ Dimensions (H x W x D): 558 mm x 568 mm x 718 mm
finish and is heavily braced to (22.0 in x 22.4 in x 28.3 in)
maximize low-frequency performance. Net Weight: 45 kg (100 lb)
The attractive CNC-machined, 14- Optional Accessories: SS4-BK: Adjustable, heavy-duty pole, M20 thread to
gauge steel grille is internally lined 35 mm
with acoustically transparent cloth to WK-4: Caster kit
For covers go to www.jblbags.com
provide additional driver protection
and give a very professional 40 Hz to 120 Hz pink noise with 6 dB crest factor, 2 hours duration.
1

Calculated based on power rating and sensitivity.

2
appearance. The rear of the enclosure
JBL continually engages in research related to product improvement. Some materials, production methods and design
is fitted with T-nuts which may be refinements are introduced into existing products without notice as a routine expression of that philosophy. For this
used to attach the optional WK-4 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.
caster kit.
䉴 STX818S 18" High Power Subwoofer
Block Diagram Frequency Response
110

Serial No. JBL PROFESSIONAL

Northridge, CA USA
Designed in the USA 100
Made in Mexico
STX818S

SPL (dB)
N108

NL4 ±1 + 90
1+ LOW
FREQ
-

CONNECTOR
PARALLEL
IN / THRU 1-
NL4
IN / THRU NL4 ±2 80
2+
2␲ half space

2-
4␲ free field

70
20 100 1000 10000 20000
1+

NOT USED ON SRX718S

Frequency (Hz)

DISCRETE
NL4 ±1 1-
NL4
IN / THRU
2+
INPUT: 8Ω
2-

INTERNAL
NL4 ±2 CONNECTORS

STX800 ®
Equipped with Differential Drive Transducer
Technology U.S. PATENTS: 5,042,072

Dimensions
100°

393.7
15.5
719.2
28.3

436.6
17.2
569.8 284.2
22.4 384.2
15.1 11.2

408.6
561.9 557.6 16.1
22.1 22.0
276.5
10.9

203.2
126.5
8.0
5.0

JBL Professional
8500 Balboa Boulevard, P.O. Box 2200
Northridge, California 91329 U.S.A.
© Copyright 2012 JBL Professional SS STX818S
CRP
www.jblpro.com 06/12 A