Thump18S
1200W 18" Powered Subwoofer
O W N E R ’ S M A N U A L
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Contents
Features
Important Safety Instructions .................................. 2
• 1200W of Room-Shaking Low End
• Professional band-pass design for maximum
output and deep, room-filling lows
• 18" custom high-output woofer
Contents................................................................. 3
Features................................................................. 3
Introduction............................................................ 4
How To Use This Manual ......................................... 4
Getting Started....................................................... 4
Things To Remember................................................ 4
Hookup Diagrams.................................................... 5
• Cool-running Class-D amplification
• Total System Optimization
• Precision crossover (140 Hz)
• Tuning filters deliver highly accurate
bass response
• Robust system protection
Thump18S Subwoofer: Rear Panel Features.............. 9
1. Power Connection ......................................... 9
2. Power Switch............................................... 9
2. Power LED.................................................... 9
4. XLR Inputs ................................................... 9
5. High Pass Outputs ...................................... 10
6. Full Range Outputs...................................... 10
7. Level Knob / OL LED................................... 11
8. Normal / Invert Switch [Polarity]................ 11
Questionairre........................................................ 11
Final Thoughts ...................................................... 11
• Application Flexible
• Dual XLR inputs for mono or stereo
applications
• Stereo high-pass outputs optimize sound
when connecting top boxes
• Stereo full-range outputs perfect for adding
more subwoofers
• User-adjustable level and polarity controls
• Easily mount your full-range loudspeaker
via pole cup
• Solid All-Wood Design
• Robust all-wood enclosure with
high-durability finish
Placement............................................................. 12
Care and Maintenance ........................................... 12
The Ins and Outs of Polarity .................................. 12
• “Built-Like-A-Tank” construction
• 82 lb / 37.2 kg
Protection Circuitry ............................................... 13
Limiting.......................................................... 13
Overexcursion Protection ................................ 13
Thermal Protection.......................................... 13
AC Power............................................................. 13
Please write the serial number here for future
reference (i.e., insurance claims, tech support,
return authorization, make dad proud, etc.)
Appendix A: Service Information............................ 14
Appendix B: Connections ....................................... 15
Appendix C: Technical Information .......................... 16
Thump18S Subwoofer Dimensions.................... 17
Thump18S Subwoofer Frequency Response....... 17
Thump18S Subwoofer Block Diagram ............... 18
Purchased at:
Date of purchase:
Limited Warranty.................................................. 19
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Part No. SW1050 Rev. A 03/14
©2014 LOUD Technologies Inc. All Rights Reserved.
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Owner’s Manual
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Introduction
Getting Started
The Thump18S 1200W 18" Powered Subwoofer
features a professional band-pass design that
delivers class-leading output and deep, room-filling
lows. Designed by the world’s leader in portable
live sound, the Thump18S provides ample power
for high-output applications, bringing your Thump
or SRM system to an entirely new level.
The following steps will help you set up the
subwoofers quickly.
1. Make all initial connections with the power
switches OFF on all equipment. Make sure the master
volume, level, or gain controls are all the way down.
2. Connect the line-level outputs from the mixing
console (or other signal source) to the XLR inputs on
the rear panel of the Thump18S subwoofers.
A full set of professional input and output
connections provide simple integration and sonic
optimization of any system. Plus, there’s ample system
protection in place to protect your investment.
3. Connect the high pass outputs from the Thump18S
subwoofers to the inputs of powered loudspeakers
(or to an amplifier powering passive loudspeakers).
With tons of power and a high-output/deep
punch band-pass design, the Thump18S is the
perfect subwoofer to complete your professional PA.
4. Connect the supplied AC power cords to the
IEC sockets on the rear panel of each subwoofer.
Plug the other end into an AC outlet properly configured
with the correct voltage as indicated below the IEC
socket.
5. Turn the mixer (or other signal source) on.
6. Turn the subwoofers on.
7. Turn the loudspeakers on.
8. Start the signal source and raise the mixer’s
main L/R fader up until audio may be heard.
9. Adjust the master volume of the mixer to a
comfortably loud listening level.
Things to Remember:
• Never listen to loud music for prolonged periods.
Please see the Safety Instructions on page 2 for
information on hearing protection.
How to Use This Manual:
After this introduction, a getting started guide will
help you get things set up fast. The hookup diagrams
show some typical setups, while the remaining sections
provide details of the Thump18S subwoofer.
• As a general guide, the mixer (or other signal
source) should be turned on first, Thump18S
subwoofers next, and loudspeakers last. As such,
the loudspeakers should also be turned off first,
followed by the subwoofers, then the mixer.
This will reduce the possibility of any turn-on
or turn-off thumps and other noises generated
by any upstream equipment from coming out of
the speakers.
This icon marks information that is critically
important or unique to the subwoofer. For
your own good, read and remember them.
• Save the shipping boxes and packing materials!
You may need them someday. Besides, the
cats will love playing in them and jumping out at
you unexpectedly. Remember to pretend like you
are surprised!
• Save your sales receipt in a safe place.
4
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Hookup Diagrams
MIC
MIC
MIC
MIC
(UNBALANCED)
L
L
TAPE
IN
TAPE
OUT
R
R
PROFESSIONAL MIC/LINE MIXER WITH FX
LINE
HI-Z
1
2
3/4
5/6
7/8
(MONO)
(MONO)
(MONO)
(MONO)
BAL
/
BAL
/
NBAL
L
L
L
L
UNBAL
L
BAL
/
BAL
/
BAL
/
BAL
/
BAL
/
LINE/HI-Z I
1
LINE I
LINE
LINE IN
3
4
LINE I
LINE IN
5
6
LINI
7
8
UNBAL
UNBAL
UNBAL
UNBAL
MON SEND
UNBAL
FOOTSWITCH
BAL
UNBAL
/
R
R
R
R
R
INSERT
U
INSERT
LINE IN
U
ST RETURN
FX SEND
MAIN OUT
PHONES
STEREO GRAPHIC EQ
U
LEVEL
SET
LEVEL
SET
LEVEL
SET
LEVEL
SET
15
10
15
10
48V
U
+
5
0
U
5
U
+5
0
U
+5
0
-20 20
GAIN
PHANTOM
POW
-20dB
+30dB
-20dB
30dB
5
0
5
0
ER
GAIN
GAIN
GAIN
GAIN
LOW CUT
100Hz
LOW CUT
100 Hz
LOW CUT
100 Hz
LOW CUT
100 Hz
5
5
P
OWER
U
EQ
U
EQ
U
EQ
U
EQ
U
EQ 10
15
12kHz
10
15
H
I
H
I
H
I
H
I
HI
MAIN
12kHz
12kHz
12kHz
12kHz
METERS
125
250
500
1K
2K
4K
8K
0dB=0dBu
-15 +15
U
-15 +
U
-15
U
-15 +15
U
-15 15
U
OL
15
10
6
MAIN MIX
MON
EQ IN
BYPASS
M
I
D
H
M
I
D
H
M
I
D
H
M
I
D
H
MID
2.5 Hz
2
.
5k
z
2
.
5k
z
2
.
5k
z
2
.
5k
z
k
-15 +15
U
-15 +15
U
-15 +15
U
-15 +15
U
-15 +15
U
3
USB
0
L
O
W
L
O
W
L
O
W
L
O
W
LOW
80Hz
FX PRESETS
80Hz
80Hz
80Hz
80Hz
2
0
1
B
R
I
G
H
T
ROOM
GE
4
0
2
W
A
R
M
L
O
U
N
-15 +15
U
-15 +15
U
-15 +15
U
-15 +15
U
-15 +15
U
U
0
3
S
M
A
L
L
S
T
A
GE
TER
L
7
0
4
W
A
R
M
M
T
H
E
A
AUX
MON
AUX
MON
AUX
MON
AUX
MON
AUX
MON
0
5
W
A
R
H
A
HALL
V
L
10
20
30
0
6
C
O
N
C
E
R
T
0
7
P
L
A
T
E
R
E
ERB
O
O
+20
0
8
CA
CHORUS
CHORUS
THEDRAL
0
9
INPUT LEVEL
L
R
O
O
U
+15
O
O
+15
O
O
+15
O
O
+15
O
O
+15
1
0
+
REV
PRESETS
U
U
U
U
1
1
D
O
U
B
L
E
R
1
2
T
A
P
E
SLAP
1
3
D
E
L
A
Y
1
2
3
(
3
0
0
m
s
)
MUTE
FX
FX
FX
FX
FX
1
4
D
E
L
A
Y
(
3
8
0
m
s
)
1
5
D
E
L
V
A
E
Y
R
(
4
8
D
0
L
m
Y
s
(
)
2
USB THRU
BREAK
O
O
+15
O
O
+15
O
O
+15
O
O
+15
O
O
+15
16
R
E
B
+
5
0
m
s
)
(MUTES ALL CHANNELS)
PAN
PAN
PAN
PAN
PAN
U
U
U
OL
O
O
+15
O
O
PHO ONES
T
L
R
L
R
L
R
L
R
L
R
O
O
+15
O
MAX
+20
APE LEVEL
FX MASTER
FX TO MON
MUTE
MUTE
MUTE
3/4
MUTE
5/6
MUTE
7/8
MUTE
OL
MON
MAIN
dB
OL
OL
OL
OL
OL
1
2
ST RTN
FX RTN
dB
10
dB
10
dB
10
dB
10
dB
10
dB
10
dB
10
dB
10
10
5
5
5
5
5
5
5
5
5
U
5
U
5
U
5
U
5
U
5
U
5
U
5
U
5
U
5
10
10
10
10
10
10
10
10
10
20
30
20
30
20
30
20
30
20
30
20
30
20
30
20
30
20
30
40
50
60
40
50
60
40
50
60
40
50
60
40
50
60
40
50
60
40
50
60
40
50
60
40
50
60
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
In this example, a Thump18S subwoofer is connected to two Thump12 loudspeakers. It is a perfect setup
for a small club.
Here, the L/R outputs of a ProFX8 mixer are connected directly to the channel A and B inputs of a single
Thump18S subwoofer.
The channel A and B high pass outputs of the Thump18S subwoofer are connected directly to the inputs
of each Thump12 loudspeaker.
Small Club System
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Hookup Diagrams continued...
MONITOR OUT
2
1
USB
R
L
BALNL
BAL/UAL
Perhaps you’re a DJ playing bumpin’ tunes in the middle of the night to a crowd that’s groovin’
and dancin’ to your fine selection.
In this example, a laptop is connected to the channel 1 and 2 inputs of an Onyx Blackjack and a set of
headphones are connected to the phones jack.
The L/R monitor outputs of the Onyx Blackjack are connected directly to the channel A inputs of each
Thump18S subwoofer.
The channel A high pass output of each Thump18S subwoofer is connected directly to the input of each
Thump15 loudspeaker.
DJ System
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Hookup Diagrams continued...
To next
Thump18S
subwoofer
input
To next
Thump18S
subwoofer
input
Main
Outs
DL1608 Mixer
Thump18S subwoofers may be daisy-chained via the male XLR connector labeled “FULL RANGE”.
Simply plug the signal source (i.e., mixer output) into the input jack(s), and patch that subwoofer’s
full range jack to the next subwoofers’s input jack, and so on, daisy-chaining multiple Thump18S
subwoofers. See above for a visual representation of daisy-chaining.
Daisy-Chaining Multiple Thump18S Subwoofers
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Hookup Diagrams continued...
Here’s how to set up a large club system. In this example, the L/R outputs of a DL1608 mixer are
connected directly to the channel A inputs of two Thump18S subwoofers. The channel A full range
outputs of these two Thump18S subwoofers are connected directly to the channel A inputs of another
set of Thump18S subwoofers. Talk about beefy low end...and we’ve only connected the subs!
The channel A high pass outputs of the last two Thump18S subwoofers are connected directly to the
inputs of the main pair of Thump12 loudspeakers.
The aux 1 and aux 2 sends from the mixer are connected directly to the inputs of a pair of Thump15
loudspeakers to be used as monitors for the band.
Large Club System
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Thump18S Subwoofer: Rear Panel Features
3.Power LED
8
7
When the power switch is turned on – and the power
cord is connected to an active AC mains supply – this
LED illuminates green to indicate that the subwoofer is
indeed really on. The cool green LED on the front of the
subwoofer works the same way.
3
4.XLR Inputs
Balanced XLR female connectors are provided for the
left and right inputs. Connect the full-range line-level
signal from the mixer (or other signal source) to these
input jacks.
4
5
6
If you are connecting a single subwoofer output, or
LFE (low-frequency effects) output to the subwoofer,
you may use either the A or B input connector.
NEVER connect the output of an amplifier
directly to the input of the subwoofer.
This could damage the input circuitry of the
active subwoofer.
2
1
They are wired as follows, according to standards
specified by the AES (Audio Engineering Society):
Balanced XLR Input Connector
Pin 1 – Shield (ground)
Pin 2 – Positive (+ or hot)
Pin 3 – Negative (– or cold)
1.Power Connection
This is a standard 3-prong IEC power connector.
Connect the detachable power cord (included in
the packaging with the subwoofer) to the power
receptacle, and plug the other end of the power
cord into an AC outlet.
2
SHIELD
COLD
HOT
1
3
SHIELD
COLD
HOT
1
Make sure that the AC power is matched to
the AC power indicated on the rear panel
(below the IEC receptacle).
3
2
Balanced XLR Input Connector
Disconnecting the plug’s ground pin is
dangerous. Don’t do it!
For more information on these connectors, see
Appendix B on page 15.
2.Power Switch
Press the top of this rocker switch inwards to turn on
the subwoofer. Press the bottom of this rocker switch
inwards to turn off the subwoofer.
As a general guide, the mixer (or other signal
source) should be turned on first, Thump18S
subwoofers next, and loudspeakers last.
As such, the loudspeakers should also be turned off first,
followed by the subwoofers, then the mixer. This will
reduce the possibility of any turn-on or turn-off thumps
and other noises generated by any upstream equipment
from coming out of the speakers.
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Thump18S Subwoofer: Rear Panel Features continued...
6. Full Range Outputs
8
7
Connect the full range outputs to the inputs of
another powered subwoofer, powered loudspeakers,
or to an amplifier powering passive loudspeakers.
Balanced XLR male connectors are provided for the
line-level A and B full range outputs.
The signal at these outputs is a direct copy of the
input signals. These outputs allow you to daisy-chain
multiple subwoofers and/or send the full range signals
to loudspeakers. It’s a great way to add side fills, too!
5
6
The level control and polarity switch have no effect
on the full range outputs. The outputs are separate and
maintain the stereo separation of the input signals.
They are wired as follows, according to standards
specified by the AES (Audio Engineering Society):
5. High Pass Outputs
Balanced XLR Output Connector
Typically, full-range loudspeakers are connected
to the high pass outputs to “split” the work with the
Thump18S subwoofer. The subwoofer handles all of the
low frequencies and the loudspeakers handle the rest.
As a result, it is more efficient and a bit louder.
Pin 1 – Shield (ground)
Pin 2 – Positive (+ or hot)
Pin 3 – Negative (– or cold)
SHIELD
1
Balanced XLR male connectors are provided for the
line-level A and B high pass outputs. The subwoofer’s
crossover splits the input signals into two frequency
bands. The low frequency range below 140 Hz goes to
the internal amplifier that powers the subwoofer. The
frequency range above 140 Hz is sent to these line-level
output jacks.
3
COLD
3
2
HOT
SHIELD
COLD
HOT
1
2
Balanced XLR Output Connector
The level control and polarity switch have no effect
on the high pass outputs. The outputs are separate and
maintain the stereo separation of the input signals.
See page 7 to learn more about daisy-chaining
Thump18S subwoofers.
For more information on these connectors, see
Appendix B on page 15.
They are wired as follows, according to standards
specified by the AES (Audio Engineering Society):
Balanced XLR Output Connector
Pin 1 – Shield (ground)
Pin 2 – Positive (+ or hot)
Pin 3 – Negative (– or cold)
SHIELD
1
3
COLD
3
2
HOT
SHIELD
COLD
HOT
1
2
Balanced XLR Output Connector
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Thump18S Subwoofer: Rear Panel Features continued...
7. Level Knob / OL LED
Questionnaire
There is quite a bit of blank space left over, so why not
fill it with a questionnaire?
The level knob adjusts the input sensitivity of the
inputs. This allows signals from the outside world to
be adjusted to run through each channel at optimal
internal operating levels. There is –6 dB of gain with the
knob fully down (off), ramping up to 6 dB of gain fully
up (max). The level control has no effect on the high
pass outputs or full range outputs.
• Beatles or Stones?
• Star Wars or Star Trek?
• Chocolate or vanilla?
• Batman or Superman?
• Dogs or cats?
The accompanying OL (overload) indicator
illuminates red when the amplifier in the Thump18S
is near the clipping point. It is OK if the OL LED blinks
occasionally, because this means that the transient
peaks are just reaching the maximum output of
the amplifier and you are getting the most out of
the subwoofer.
• Beer or whiskey?
• Pizza or cheeseburger?
• Football or baseball?
• Playstation or Xbox?
• Jimmy Page or Jimi Hendrix?
• Family Guy or South Park?
• Coffee or tea?
However, if the OL LED is blinking frequently
or continuously, turn down the level control on
the Thump18S or turn down the signal at its source
(e.g., the mixing console) until the OL LED blinks
occasionally or not at all.
• What is your favorite color?
8. Normal/Invert Switch [Polarity]
This switch reverses the polarity of the signal going
into the subwoofer amplifier by 180˚. It has no effect on
the signal at the outputs.
• What is the air-speed velocity of an unladen
swallow?
Final Thoughts
The following pages discuss Thump18S placement, an
in-depth look at polarity, protection circuitry, technical
information and much more. Check it out!
There is no right or wrong setting for this switch.
Listen to the overall blend of the subwoofer with
the rest of the system and select the switch position
that gives you the best sound for your audience.
In fact, your system may vary when positioned
differently and in alternate venues. Don’t be afraid
to experiment with the position of the polarity switch.
See page 12 for more information.
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Placement
The Ins and Outs of Polarity
The Thump18S subwoofer is designed to sit on the
floor or stage. It is not designed to be pole-mounted
or suspended.
Thump18S subwoofers include a switch that allows
you to quickly invert the polarity of the subwoofer’s
output relative to the input signal it is receiving from
the mixer or other sound source. But what exactly does
that mean? A subwoofer works by literally pumping air
as the woofer cone moves in and out with respect to the
cabinet in which it is housed. It does so according to the
low-frequency portion of the signal it receives from the
sound source.
When pole-mounting loudspeakers, be sure that the
Thump18S subwoofers are stabilized and secured from
falling over or being accidentally pushed over. For
stacked scenarios, it is highly suggested that straps are
utilized. Failure to follow these precautions may result
in damage to the equipment, personal injury, or death.
The woofer cone is simply following the waveform as
seen in the sine wave in Figure 1. As the sine wave rises,
the woofer cone pushes out. Likewise, as the sine wave
falls, the woofer cone pulls into the cabinet. A musical
signal is much more complex, of course, but the same
principle applies. Movement of the woofer cone causes
air pressure changes that we perceive as sound.
The cabinet has no rigging points and is
not suitable for rigging. NEVER attempt
to suspend an Thump18S subwoofer by its
handles.
As with any powered components, protect them from
moisture and extreme cold and follow the other Care
and Maintenance suggestions below.
When the normal/invert [polarity] switch is
engaged, the original waveform is simply reversed
180˚ [see Figure 2]. Again, the subwoofer cone
follows the waveform. However, this time the woofer
cone starts by pulling into the cabinet followed by the
woofer cone pushing out. If you have ever experimented
with a subwoofer polarity switch, you may not have
noticed any changes to the sound regardless of its
position, especially if you are listening to just the
subwoofer. This is normal, as our ears perceive them
both at the same time.
Care and Maintenance
Your Thump18S subwoofers will provide many years of
reliable service if you follow these guidelines:
•
Avoid exposing the subwoofers to moisture.
If they are set up outdoors, be sure they are
under cover if rain is expected.
•
Avoid exposure to extreme cold (below
freezing temperatures). If you must operate
the subwoofers in a cold environment, warm
up the voice coils slowly by sending a low-level
signal through them for about 15 minutes prior
to high-power operation.
The normal/invert [polarity] switch comes into
play when the Thump18S subwoofer is paired with a
loudspeaker. Ideally, the woofer cones of the subwoofer
and full range loudspeaker would work together by
pushing and pulling in unison. Thump18S subwoofers
are designed to be used in a broad range of applications.
The flexibility provided by the polarity switch is
necessary to ensure that you are receiving the best
possible sound from your system, regardless of your
setup.
•
Use a dry cloth to clean the cabinets. Only do
this when the power is turned off. Avoid getting
moisture into any of the openings of the
cabinet, particularly where the drivers are
located.
Polarity Waveforms
Figure 1: Normal [0˚]
<–– Time ––>
Figure 2: Invert [180˚]
<–– Time ––>
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Thermal Protection
Protection Circuitry
The Thump18S subwoofer employs a built-in limiter
for less distortion at peak levels. Additional protection
includes automatic thermal shutdown should the amp
overheat. However, with Class-D amp technology, which
is highly-efficient, this should never be a problem.
All amplifiers produce heat. The Thump18S is
designed to be efficient both electrically and thermally.
In the unlikely event of the amplifier overheating,
a built-in thermal switch will activate, muting the
signal.
The protection circuits are designed to
protect the subwoofers under reasonable
and sensible conditions. Should you choose
When the amplifier has cooled down to a safe
operating temperature, the thermal switch resets
itself, and the Thump18S subwoofer resumes normal
operation.
to ignore the warning signs [e.g. excessive distortion],
you can still damage the speaker in the Thump18S by
overdriving it past the point of amplifier clipping.
Such damage is beyond the scope of the warranty.
If the thermal switch activates, try turning down
the level control a notch or two on the mixing console
(or the back of the subwoofer) to avoid overheating the
amplifier. Be aware that direct sunlight and/or hot stage
lights may be the culprit of an amplifier overheating.
Limiting
The driver has its own compression circuit which
helps protect it from damaging transient peaks.
The compressor is designed to be transparent and
is not noticeable under normal operating conditions.
AC Power
Be sure the Thump18S subwoofer is plugged into
an outlet that is able to supply the correct voltage
specified for your model. It will continue to operate
at lower voltages, but will not reach full power.
Overexcursion Protection
A subsonic filter circuit just prior to the power
amplifier prevents ultra-low frequencies from being
amplified. Excessive low-frequency energy can damage
the woofer by causing it to “bottom out,” also know
as overexcursion, which is equivalent to a mechanical
form of clipping.
Be sure the electrical service can supply enough
amperage for all the components connected to it.
We recommend that a stiff (robust) supply of AC
power be used because the amplifiers place high
current demands on the AC line. The more power that is
available on the line, the louder the speakers will play
and the more peak output power will be available for a
cleaner, punchier bass. A suspected problem of “poor
bass performance” is often caused by a weak AC supply
to the amplifiers.
Never remove the ground pin on the
power cord or any other component of the
Thump18S subwoofer. This is very dangerous.
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Appendix A: Service Information
If you think your Thump18S has a problem, please
check out the following troubleshooting tips and do
your best to confirm the problem. Visit the Support
will find lots of useful information such as FAQs and
other documentation. You may find the answer to the
problem without having to part with your subwoofer.
Poor bass performance
• Check the polarity of the connections between the
mixer and the subwoofers. You may have your
positive and negative connections reversed at one
end of one cable, causing one subwoofer to be
out-of-phase with the other.
• Poor bass performance may be the result of bad
AC power. See the section titled ‘AC Power’ on
the previous page for further details.
Troubleshooting
No power
Poor sound
• Our favorite question: Is it plugged in? Make sure
the AC outlet is live [check with a tester or lamp].
• Is it loud and distorted? Make sure that you’re not
overdriving a stage in the signal chain. Verify that
all level controls are set properly.
• Our next favorite question: Is the power switch
on? If not, try turning it on.
• Is the input connector plugged completely into
the jack? Be sure all connections are secure.
• Make sure the line cord is securely seated in the
line cord socket and plugged all the way into the
AC outlet.
Noise
• Is the power LED on the front and rear panel
illuminated? If not, make sure the AC outlet
is live. If so, refer to “No sound” below.
• Make sure all connections to the active
subwoofers are good and sound.
• Make sure none of the signal cables are routed
near AC cables, power transformers, or other
EMI-inducing devices.
• The internal AC line fuse may be blown. This is
not a user serviceable part. If you suspect the
AC line fuse is blown, please see the "Repair"
section next.
• Is there a light dimmer or other SCR-based device
on the same AC circuit as the Thump18S? Use an
AC line filter or plug the subwoofer into a
different AC circuit.
No sound
• Is the level knob for the input source turned all
the way down? Verify that all the volume controls
in the system are properly adjusted. Look at the
level meter to ensure that the mixer is receiving
a signal.
Hum
• Try disconnecting the cable connected to the
input jack. If the noise disappears, it could be
a “ground loop,” rather than a problem with the
Thump18S subwoofer. Try some of the following
troubleshooting ideas:
• Is the signal source working? Make sure the
connecting cables are in good repair and securely
connected at both ends. Make sure the output
level control on the mixing console is turned up
sufficiently to drive the inputs of the speaker.
• Use balanced connections throughout your system
for the best noise rejection.
• Make sure the mixer does not have a mute on or a
processor loop engaged. If you find something like
this, make sure the level is turned down before
disengaging the offending switch.
• Whenever possible, plug all the audio equipment’s
line cords into outlets which share a common
ground. The distance between the outlets and the
common ground should be as short as possible.
• Has it shut down? Make sure there is at least
six inches of free space behind each Thump18S
subwoofer.
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Repair
For warranty service, refer to the warranty
information on page 19.
Non-warranty service is available at a factory-
authorized service center. To locate the nearest
Tech Support” and select “Locate a Service Center
or Distributor” [3]. Service for Thump18S subwoofers
outside the United States can be obtained through local
dealers or distributors.
If you do not have access to our website, you may call
the Tech Support department at 1-800-898-3211,
Monday-Friday, during normal business hours, Pacific
Time, to explain the problem. Tech Support will tell you
where the nearest factory-authorized service center is
located in your area.
Appendix B: Connections
Balanced XLR Input Connector
Balanced XLR Output Connector
Each Thump18S subwoofer has two female
XLR inputs. Be sure the cables are wired per
AES (Audio Engineering Society) standards:
There are also four male balanced XLR output
connectors on each Thump18S subwoofer [two high
pass and two full range]. Be sure the cables are wired
per AES (Audio Engineering Society) standards:
Balanced XLR Input Connector
Pin 1 – Shield (Ground)
Balanced XLR Output Connector
Pin 1 – Shield (Ground)
Pin 2 – Positive (+ or hot)
Pin 3 – Negative (– or cold)
Pin 2 – Positive (+ or hot)
Pin 3 – Negative (– or cold)
2
SHIELD
HOT
SHIELD
1
1
3
COLD
3
COLD
3
2
SHIELD
COLD
HOT
HOT
1
SHIELD
COLD
HOT
1
3
2
2
Balanced XLR Input Connector
Balanced XLR Output Connector
Thump18S subwoofers may be daisy-chained via the
male XLR connector labeled “FULL RANGE”. Simply
plug the signal source (i.e., mixer output) into the
input jack(s), and patch that subwoofer’s full range
jack to the next subwoofer’s input jack, and so on,
daisy-chaining multiple Thump18S subwoofers. See
page 7 for a visual representation of daisy-chaining.
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Appendix C: Technical Information
Thump18S Subwoofer Specifications
Acoustic Performance:
Frequency Response (–3 dB)
Frequency Response (–10 dB)
Max peak SPL
Safety Features
Input Protection
40 Hz – 120 Hz
30 Hz – 132 Hz
130 dB
Peak and RMS limiting,
power supply and amplifier
thermal protection
Display LEDs
Front and rear power ON,
Rear OL limiter
Crossover Point
140 Hz
Slope
2nd order HP, 6th order LP
Construction Features
Cabinet
Transducer
Exterior grade 15 mm plywood
Woofer Diameter
Voice Coil Diameter
Cone Material
18 in / 457 mm
3.0 in / 76 mm
Paper
Finish
Textured black catalyzed
polyurethane paint
Handles
One on each side
Magnet Material
Ferrite
Physical Properties
Height
Width
Depth
Weight
26.5 in / 672 mm
22.6 in / 573 mm
22.8 in / 580 mm
82 lb / 37.2 kg
Power Amplifier
Rated Power
600 watts rms
1200 watts peak
Rated THD
Cooling
< 1%
Convection
Class D
Design
Mounting Methods
The Thump18S subwoofer is designed to sit on the floor or
stage. It is NOT designed to be pole-mounted or suspended.
The cabinet has no rigging points and is not suitable for rigging.
Never attempt to suspend the Thump18S by its handles.
Input/Output
Input Type
Input Impedance
Female XLR balanced
20 k balanced,
Options
Thump18S Cover
20 k unbalanced
P/N 2036809-25
P/N 2035170-01
Full Range Outputs
High Pass Outputs
Male XLR balanced
SPM200 Loudspeaker Pole Mount
Male XLR impedance balanced
Disclaimer
Since we are always striving to make our products better by
incorporating new and improved materials, components, and
manufacturing methods, we reserve the right to change these
specifications at any time without notice.
Line Input Power
US detachable line cord
EU detachable line cord
AC Connector
100 – 120 VAC, 50 – 60 Hz, 150W
220 – 240 VAC, 50 – 60 Hz, 150W
3-pin IEC 250 VAC, 10 A male
Switchmode
The “Running Man” figure is a registered trademark of LOUD
Technologies Inc.
Power Supply Type
All other brand names mentioned are trademarks or registered
trademarks of their respective holders, and are hereby
acknowledged.
©2014 LOUD Technologies Inc.
All Rights Reserved.
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Thump18S Subwoofer Dimensions
26.5 in
26.5 in
672 mm
672 mm
22.8 in
22.6 in
573 mm
580 mm
WEIGHT
82 lb
37.2 k g
22.8 in
580 mm
22.6 in
573 mm
Thump18S Subwoofer Frequency Response
+10 dB
0 dB
–10 dB
–20 dB
10
100
1000
10000 20000
Frequency (Hz)
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Thump18S Subwoofer Block Diagram
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Limited Warranty
Please keep your sales receipt in a safe place.
This Limited Product Warranty (“Product Warranty”) is provided by LOUD Technologies Inc. (“LOUD”)
and is applicable to products purchased in the United States or Canada through a LOUD-authorized
reseller or dealer. The Product Warranty will not extend to anyone other than the original purchaser
of the product (hereinafter, “Customer,” “you” or “your”).
For products purchased outside the U.S. or Canada, please visit www.720trees.com to find contact
information for your local distributor, and information on any warranty coverage provided by the
distributor in your local market.
LOUD warrants to Customer that the product will be free from defects in materials and workmanship
under normal use during the Warranty Period. If the product fails to conform to the warranty then LOUD
or its authorized service representative will at its option, either repair or replace any such nonconforming
product, provided that Customer gives notice of the noncompliance within the Warranty Period to the
Company at: www.720trees.com or by calling LOUD technical support at 1.800.898.3211 (toll-free in
the U.S. and Canada) during normal business hours Pacific Time, excluding weekends or LOUD holidays.
Please retain the original dated sales receipt as evidence of the date of purchase. You will need it to obtain
any warranty service.
For full terms and conditions, as well as the specific duration of the Warranty for this product, please
visit www.720trees.com.
The Product Warranty, together with your invoice or receipt, and the terms and conditions located at
www.720trees.com constitutes the entire agreement, and supersedes any and all prior agreements
between LOUD and Customer related to the subject matter hereof. No amendment, modification or
waiver of any of the provisions of this Product Warranty will be valid unless set forth in a written
instrument signed by the party to be bound thereby.
Need help with the subwoofer?
• Telephone 1-800-898-3211 to speak with one of our splendid technical support chaps
(Monday through Friday, normal business hours, Pacific Time).
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16220 Wood-Red Road NE
Woodinville, WA 98072 • USA
Phone: 425.487.4333
Toll-free: 800.898.3211
Fax: 425.487.4337
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