Mackie Speaker SWA1801 User Manual

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  
O F 4 P A G E S  
1
 
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  
O F 4 P A G E S  
3
 
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  
800.898.3211, fax 425.487.4337, [email protected]  
O F 4 P A G E S  
4
UK +44.1268.570.808, fax +44.1268.570.809, [email protected]  
 

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