SWA1801
Active Subwoofer System
SWA1801
The SWA1801 is an 18-inch high output, active sub-
woofer system. It features a newly designed high-preci-
sion 18-inch transducer combined with application-specific
amplifier technology. The system is composed of a single,
compact subwoofer cabinet with built-in control and ampli-
fier electronics.
The transducer used in the SWA1801 system features a
precision 4-inch voice coil that offers extreme power han-
dling capabilities. The magnetic assembly used features
advancements in coil venting, composite polymide former
construction, and structural cooling that provide lower
temperature rise and substantially improved power com-
pression characteristics.
The amplifier found in the SWA1801 cabinet is an
example of application-specific amplifier design that can
be exercised when designing active speaker systems. The
system uses a proprietary high-efficiency, high-current
amplifier designed to provide high current levels at all
levels of operation. Having access to high current levels,
no matter what the power output, is absolutely critical
in achieving precise, total control of the woofer mass.
This control is responsible for lowering audible distor-
tion artifacts and providing aggressive attack through the
operating band pass of the system. The amplifier, which is
mounted on a large, finned aluminum heat sink, is rated at
800 watts rms continuous output.
Features
Active, high-output 18-inch subwoofer system with
4-inch voice coil
High-efficiency, high-current 800 watt rms
continuous output amplifier
High output 135 dB of peak SPL
Response down to 35Hz (–10 dB point)
Can be used with active or passive speaker systems
Built-in crossover network with stereo or mono high-
pass outputs
Recessed level control, center detent rotating knob
(–15 to +5 dB)
The SWA1801 features a sophisticated on board con-
Recessed phase switch (0°–180°)
Compact, portable enclosure
trol system, allowing for flexible integration with active or
passive full range or mid/high speaker systems. The input
panel accepts a line-level input signal and has LOOP OUT
connectors for signal routing to other devices. It also has
HIGH PASS out connectors for connection to active full range
speakers or amplifiers powering passive full range speakers.
All signal routing is through XLR connectors in L+R stereo
or mono. There is a phase selection switch and a recessed
level control. The system features thermal protection for
the power supply and amplifier and also incorporates rms
limiting protection for the amplifier stage that limits the
amount of long term power delivered to the transducer.
The cabinet is constructed using 18 mm thick multi-
layered birch plywood and finished in black splatter paint.
There is one handle on each side for efficient loading and
transport as well as a top, female pole mount fixture.
Small footprint allows for unobtrusive, strategic
placement
Baltic birch wood construction, built-in pole mount
Correctly weight-balanced enclosure
Two comfortable side handles for easy carrying and
setup
Applications
Live Sound/Music Reinforcement
High-Level AV Playback
Small to Medium-Sized Portable PA Systems
Corporate Events
R E L A T E D P R O D U C T S
SRM350/SRM450/SR1530/SA1521/SA1232 Active Loud-
speakers, SWA1501 Active Subwoofer, 1202-VLZ PRO
12-Channel Mic/Line Mixer, 1402-VLZ PRO 14-Channel
Mic/Line Mixer, 1604-VLZ PRO and 1642-VLZ PRO 16-
Channel Mic/Line Mixers.
Night Clubs
Houses of Worship
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Active Subwoofer System
SWA1801
SWA1801 On-Axis Frequency Response
(With Second and Third Harmonic Components)
110
100
Fundamental
Second
90
80
70
60
50
40
Third
20
100
1000
10000
20000
Frequency (Hz)
SWA1801 Rear Panel Connector Plate
LIMIT
SIGNAL
THERMAL
POWER
PARALLEL
HIGH PASS
(MID/HIGH FREQ)
OUTPUT
SUBWOOFER
CONTROL
THRU
FULL RANGE
INPUT
(FULL RANGE OUTPUT)
120Hz
NORMAL
L
L
SUBWOOFER
LEVEL
IN
OUT
NORMAL
R
R
REV 180
PHASE
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Active Subwoofer System
SWA1801
Architects’ and Engineers’ Specifications
Thermal protection shall be provided by a heat
sink-mounted thermal sensor, which monitors the
heat sink temperature and triggers the thermal
protection circuit should the temperature exceed
140° F (60° C). The Thermal LED shall light and the
input signal shall be muted until the heat sink cools
to a safe operating level, at which point the thermal
protection circuit auto-resets and normal operation
resumes.
Overload protection shall be provided by a lim-
iter circuit, which monitors the amplifier output and
reduces the input level to the amplifier should the
amplifier output begin to clip.
The enclosure shall have a rectangular shape
and shall incorporate two side handles, one on each
side, and a top-mounted pole receptacle. The enclo-
sure shall be constructed of multi-ply wood.
The active subwoofer loudspeaker system shall
be the Mackie SWA1801.
The active subwoofer loudspeaker system shall
incorporate one 18-inch low-frequency (LF) trans-
ducer mounted within a vented enclosure and
tuned for optimum low-frequency response. System
frequency response shall vary no more than ±3 dB
from 45 Hz to 120 Hz measured on axis. The loud-
speaker shall incorporate a low-frequency amplifier
system capable of delivering 800 watts rms over
a frequency range of 30 Hz to 150 Hz. The system
shall provide 129 dB of continuous output and
135 dB of peak output. The amplifier system shall
be mounted on an aluminum heat sink, which shall
be mounted on the rear of the enclosure, and shall
be convection cooled.
The rear-mounted amplifier assembly shall com-
prise separate signal and AC power panels sepa-
rated by a large aluminum heat sink. The signal
input panel shall contain two input and two loop-
through XLR connectors, two high-pass output XLR
connectors, a volume level control, a phase switch,
and four status LEDs for Power ON, Signal Pres-
ent, Limit, and Thermal functions. The system shall
accept a standard line-level signal via the XLR input
connectors. The power switch and IEC AC connector
shall be located on the power panel.
Electronic files for this product available at:
This Specification Sheet
Owner/Operator’s Manual
SWA1801_SS.PDF
SWA1801_OM.PDF
LOUD Technologies continually engages in research related to product improvement. New material,
production methods, and design refinements are introduced into existing products without notice
as a routine expression of that philosophy. For this reason, any current LOUD Technologies product
may differ in some respect from its published description, but will always equal or exceed the origi-
nal design specifications unless otherwise stated. ©1999-2004 LOUD Technologies Inc. All rights
reserved.
Part No. 0003348 Rev C 09/05
16220 Wood-Red Road NE, Woodinville, WA 98072 USA
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UK +44.1268.570.808, fax +44.1268.570.809, [email protected]
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