Mackie Headphones 1850 User Manual

SRM1850 • SRM2850  
1600W 18" POWERED SUBWOOFERS  
O W N E R ’ S M A N U A L  
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Contents  
Features  
Important Safety Instructions .................................. 2  
• 1600W of intense power paired with custom  
high-output 18" woofers for room-shaking,  
chest-pounding low end performance  
Contents................................................................. 3  
Features................................................................. 3  
Introduction............................................................ 4  
How To Use This Manual ......................................... 4  
Getting Started....................................................... 4  
Things To Remember................................................ 4  
Hookup Diagrams.................................................... 5  
• “Built-Like-A-Tank” all-wood, internally-braced  
cabinet delivers professional-grade road-  
worthiness and near-zero distortion, even  
at high volume  
• Front ported for maximum low-frequency  
extension and punch  
SRM Subwoofer: Rear Panel Features ...................... 8  
1. Power Connection ......................................... 8  
2. Power Switch............................................... 8  
3. XLR Inputs ................................................... 8  
4. Normal / Invert Switch [Polarity].................. 9  
5. Gain Knob & Sig / Lim LED............................ 9  
6. High Pass Outputs ........................................ 9  
7. Full Range Outputs........................................ 9  
8. Stereo / Mono Switch [Full Range].............. 10  
9. High Pass Mode.......................................... 10  
10. Main Logo Switch ..................................... 10  
11. Extra Knobs, Buttons and LEDs .................. 10  
12. Rock ‘n Roll.............................................. 10  
• Stereo XLR inputs plus stereo XLR full-range  
and high-pass outputs  
• Integrated digital crossover with variable  
control and presets for SRM loudspeakers  
• Smart ProtectDSP kicks in to protect your  
investment when things get pushed a little  
too hard  
• Built-in cup for easily pole-mounting full-range  
loudspeakers  
Placement............................................................. 11  
The Ins and Outs of Polarity .................................. 11  
Smart Protect ....................................................... 12  
Limiting.......................................................... 12  
Overexcursion Protection ................................ 12  
Thermal Protection.......................................... 12  
AC Power............................................................. 12  
Care and Maintenance ........................................... 12  
Please write your serial number here for future  
reference (i.e., insurance claims, tech support,  
return authorization, make dad proud, etc.)  
Purchased at:  
Appendix A: Service Information............................ 13  
Appendix B: Connections ....................................... 14  
Appendix C: Technical Information .......................... 15  
SRM1850 Subwoofer Dimensions .................... 16  
SRM1850 Subwoofer Frequency Response....... 16  
SRM2850 Subwoofer Dimensions .................... 17  
SRM2850 Subwoofer Frequency Response....... 17  
SRM Subwoofer Block Diagram........................ 18  
Date of purchase:  
Limited Warranty.................................................. 19  
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Part No. SW0986 Rev. B 06/14  
©2014 LOUD Technologies Inc. All Rights Reserved.  
3
Owner’s Manual  
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Introduction  
Getting Started  
SRM 18" Powered Subwoofers are “Built-like-a-Tank,”  
delivering 1600W of intense power in an ultra-high out-  
put design that can shake the room. The professional-  
grade, internally-braced all-wood enclosure provides  
tour level road-worthiness with maximum low-frequen-  
cy extension and punch.  
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 SRM subwoofers.  
SRM subwoofers feature stereo XLR inputs, full-range  
and high-pass outputs plus a variable digital crossover  
that includes presets for SRM top boxes.  
3. Connect the high pass outputs from the SRM  
subwoofers to the inputs of powered loudspeakers  
(or to an amplifier powering passive loudspeakers).  
The Smart ProtectDSP is also in place to protect  
your investment when things get pushed a little too  
hard. Get the high-output, air-moving lows you demand  
in a rock solid subwoofer with our proven performance.  
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.  
10. Read the rest of this manual to learn how to set  
the high pass mode to really dial in a sound for the  
venue.  
How to Use This Manual:  
Things to Remember:  
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 SRM subwoofers.  
• Never listen to loud music for prolonged periods.  
Please see the Safety Instructions on page 2 for  
information on hearing protection.  
This icon marks information that is critically  
important or unique to the subwoofer. For  
your own good, read and remember them.  
• As a general guide, the mixer (or other signal  
source) should be turned on first, 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.  
• 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!  
4
SRM1850 • SRM2850 Powered Subwoofers  
• Save your sales receipt in a safe place.  
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Hookup Diagrams  
SIG/OL  
SIG/OL  
SIG/OL  
SIG/OL  
SIG/OL  
SIG/OL  
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  
/
UNBAL  
L
L
L
L
UNBAL  
L
BAL  
/
BAL  
/
BAL  
/
BAL  
/
BAL  
/
LINE/HIIN  
1
LINE I
2
LINN  
LINE IN  
3
4
LINE I
LINE IN  
6
LINE
8
UNBAL  
UNBAL  
UNBAL  
UNBAL  
MOSEND  
UNBAL  
FOOTSWITCH  
BAL  
UBAL  
/
R
R
R
R
R
INSERT  
U
INSERT  
LINE IN  
U
ST RETURN  
FX SEND  
MAIN OUT  
PHONES  
STEREO GRAPHIC EQ  
U
POWER CONSUMPTION 200W  
POWER CONSUMPTION 200W  
LEVEL  
SET  
LEVEL  
SET  
LEVEL  
SET  
LEVEL  
SET  
15  
10  
15  
10  
48V  
U
5
0
U
+
5
0
U
+5  
0
U
5  
-20 +20  
GAIN  
PHANTOM  
POW  
-20dB  
+30dB  
-20dB  
+30dB  
5
0
5
0
ER  
GAIN  
GAIN  
GAIN  
GAIN  
LOW CUT  
100Hz  
SRM  
550  
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  
SRM  
650  
0dB=0dBu  
-15 5  
U
-15 +15  
U
-15 +15  
U
-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
VAR  
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  
4
0
2
W
A
R
M
LOUNGE  
-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
G
E
7
0
4
W
A
R
M
T
H
E
A
TER  
AUX  
MON  
AUX  
MON  
AUX  
MON  
AUX  
MON  
AUX  
MON  
05  
W
A
R
M
H
A
L
L
10  
20  
30  
0
6
C
O
N
C
E
R
T
HALL  
0
7
P
C
L
A
A
T
E
REVERB  
O
O
+20  
08  
THEDRAL  
0
9
CHORUS  
INPUT LEVEL  
L
R
O
O
U
+15  
O
O
U
+15  
O
O
U
+15  
O
O
U
+15  
O
O
U
+15  
1
0
C
H
O
R
U
S
+
REV  
PRESETS  
11  
DOUBLER  
12  
T
A
P
E
S
LAP  
1
3
D
E
L
L
L
A
A
A
Y
Y
Y
1
2
3
(
3
8
8
0
0
0
0
m
m
m
s
s
s
)
)
)
MUTE  
FX  
FX  
FX  
FX  
FX  
1
4
D
E
(
3
15  
DE  
(
4
USB THRU  
BREAK  
O
O
+15  
O
O
+15  
O
O
+15  
O
O
+15  
O
O
+15  
16  
R
E
V
E
R
B
+
D
L
Y
(250ms)  
(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
SRM  
550  
SRM  
650  
VAR  
POWER CONSUMPTION 200W  
In this example, an SRM1850 subwoofer is connected to two SRM650 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  
SRM1850 subwoofer.  
The channel A and B high pass outputs of the SRM1850 subwoofer are connected directly to the channel  
1 inputs of each SRM650 loudspeaker. Be sure that the gain knob on each is set to “line” or get ready to  
be blasted! Select the SRM650 high pass mode on the SRM1850 for a matched system.  
Small Club System  
5
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Hookup Diagrams continued...  
SIG/OL  
SIG/OL  
SIG/OL  
SIG/OL  
SIG/OL  
SIG/OL  
SRM  
650  
SRM  
750  
VAR  
SRM  
650  
SRM  
650  
SRM  
750  
SRM  
750  
VAR  
VAR  
POWER CONSUMPTION 200W  
POWER CONSUMPTION 200W  
SRM  
650  
SRM  
650  
SRM  
750  
SRM  
750  
VAR  
VAR  
POWER CONSUMPTION 200W  
POWER CONSUMPTION 200W  
Feel the awesome power! In this example, a pair of SRM2850 subwoofers line each side of the venue...  
four subs total! The top sub on each side is connected to an SRM750 loudspeaker. This fully powered PA  
is desired when you really need a slammin’ system with deep, commanding lows and nice, crisp highs.  
Here, the L/R outputs of a DL1608 mixer are connected directly to the channel A input of each  
bottom SRM2850 subwoofer. The channel A full range output of each (bottom) SRM2850 subwoofer  
is connected directly to the channel 1 input of each (top) SRM2850 subwoofer.  
From here, the channel A high pass output of each (top) SRM2850 subwoofer is connected directly to the  
channel 1 input of each SRM750 loudspeaker. Be sure that the gain knob on each is set to “line” or get  
ready to be blasted! Select the SRM750 high pass mode on the SRM2850 for a matched system.  
***Please note that the SRM750 loudspeakers are stacked on top of the SRM2850 subwoofers, not  
pole-mounted. SRM750s may be pole-mounted on a tripod stand, but must be stacked on subwoofers.  
BIG PA  
6
SRM1850 • SRM2850 Powered Subwoofers  
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Hookup Diagrams continued...  
To next SRM  
subwoofer  
input  
To next SRM  
subwoofer  
input  
Main  
Outs  
SRM  
550  
SRM  
550  
SRM  
550  
SRM  
550  
SRM  
650  
SRM  
650  
SRM  
650  
SRM  
650  
VAR  
VAR  
VAR  
VAR  
DL1608 Mixer  
SRM 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 subwoofers full range jack  
to the next subwooferss input jack, and so on, daisy-chaining multiple SRM subwoofers. See above  
for a visual representation of daisy-chaining.  
Daisy-Chaining Multiple SRM Subwoofers  
7
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SRM Subwoofer: Rear Panel Features  
9
2.Power Switch  
SRM  
550  
Press the top of this rocker switch inwards to turn on  
the subwoofer. The front panel Running Man logo will  
glow with happiness...or at least it will if the subwoofer  
is plugged into a suitable live AC mains supply and the  
main logo switch [10] is disengaged.  
SRM  
650  
5
VAR  
10  
7
4
8
Press the bottom of this rocker switch inwards to turn  
off the subwoofer.  
3
6
As a general guide, the mixer (or other signal  
source) should be turned on first, SRM  
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.  
3.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.  
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.  
11  
NEVER connect the output of an amplifier  
directly to the input of the subwoofer.  
This could damage the input circuitry of the  
active subwoofer.  
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)  
2
1
2
SHIELD  
COLD  
POWER CONSUMPTION 200W  
HOT  
1.Power Connection  
1
3
SHIELD  
COLD  
HOT  
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.  
1
3
2
Balanced XLR Input Connector  
Make sure that the AC power is matched to  
the AC power indicated on the rear panel  
(below the IEC receptacle).  
For more information on these connectors, see  
Appendix B on page 14.  
Disconnecting the plug’s ground pin is  
dangerous. Don’t do it!  
8
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SRM Subwoofer: Rear Panel Features continued...  
4. 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.  
5
There is no right or wrong setting for this switch.  
4
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 11 for more information.  
6
7
5. Gain Knob & Sig / Lim LED  
The gain knob adjusts the input sensitivity of the  
mic 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).  
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)  
The accompanying dual-colored LED will illuminate  
green when the input signal is present, indicating  
signal. It will remain lit so long as there is signal above  
–20 dBu present.  
SHIELD  
1
3
COLD  
3
2
HOT  
SRM subwoofers have a built-in limiter that  
helps to prevent the amplifier outputs from clipping  
or overdriving the transducers. The LED illuminates  
yellow when the limiter is activated. It’s okay for it  
to blink yellow occasionally, but if it blinks frequently  
or lights continuously, turn down the gain knob until  
it only blinks occasionally.  
SHIELD  
COLD  
HOT  
1
2
Balanced XLR Output Connector  
7. Full Range Outputs  
Excessive limiting may lead to  
overheating, which in turn trips the  
thermal protect circuitry and interrupts  
the performance. See ‘Thermal Protection’ on  
page 12 for more information.  
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!  
6. High Pass Outputs  
Typically, full-range loudspeakers are connected  
to the high pass outputs to “split” the work with  
the 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.  
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  
20 Hz – 200 Hz goes to the internal amplifier that  
powers the subwoofer. The frequency range above  
20 Hz – 200 Hz is sent to these line-level output jacks.  
The frequency range depends on where the high pass  
mode [9] is set.  
9
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SRM Subwoofer: Rear Panel Features continued...  
Frequencies below the crossover frequency are sent  
SRM  
550  
to the subwoofer. Additionally, the SRM loudspeaker  
presets apply alignment delay to the subwoofer creating  
an optimally aligned 3-way system. Frequencies above  
the selected crossover frequency are sent to the high  
pass outputs [6]. The high pass mode should be set  
to the lowest frequency response rating of the main  
loudspeakers. Press the high pass mode button  
repeatedly until the desired high pass mode setting  
LED illuminates. If “variable” is selected, turn the high  
pass mode knob to the frequency you desire.  
SRM  
650  
VAR  
9
10  
8
They are wired as follows, according to standards  
specified by the AES (Audio Engineering Society):  
SRM550 – 115 Hz plus alignment delay  
SRM650 – 115 Hz plus alignment delay  
SRM750 – 115 Hz plus alignment delay  
VAR – 60 Hz – 120 Hz  
Balanced XLR Output Connector  
Pin 1 – Shield (ground)  
Pin 2 – Positive (+ or hot)  
Pin 3 – Negative (– or cold)  
10. Main Logo Switch  
SHIELD  
1
The Running Man logo on the front of the subwoofer  
illuminates when this switch is disengaged and AC  
power is available at the mains input [1]. Engage  
the switch if you do not want the Running Man logo  
to illuminate.  
3
COLD  
3
2
HOT  
SHIELD  
COLD  
HOT  
1
2
11. Extra Knobs, Buttons and LEDs  
Balanced XLR Output Connector  
What’s cooler than extra bells and whistles on a new  
toy? Well, a lot of things, I suppose, but that didn’t stop  
us! The rear panel of each SRM subwoofer is stacked  
with a variety of extra knobs, buttons and LEDs. We ran  
out of time, so we’re not really sure what any of them  
does. Go ahead and experiment with each knob and  
button. Once you have an idea of what each feature is  
used for, be sure to drop us a line to let us know. We can  
revise the manual with this newfound knowledge, all  
thanks to you!  
See page 7 to learn more about daisy-chaining SRM  
loudspeakers.  
For more information on these connectors, see  
Appendix B on page 14.  
8. Stereo/Mono Switch [Full Range]  
This switch allows you to choose whether the  
A and B inputs are sent out separately [switch out] or  
as a mono sum of both inputs [switch in].  
For example, if a mixer’s L/R outputs are connected  
to the A and B inputs of an SRM subwoofer and the full  
range outputs are connected to strategically placed  
SRM loudspeakers, engage the switch so the signal is  
mono-summed. Otherwise, you’ll get just the left or  
right signal from the mixer’s output sent from the A  
and B full range outputs to the SRM loudspeakers.  
11  
12. Rock ‘n Roll  
9. High Pass Mode  
Congratulations, you have reached the end of  
the features section! At this point, you should have  
a pretty good understanding of how the SRM subwoofer  
functions. If this is true, the next step is to rock ‘n roll!  
If this is not true, head back to page 8 and read  
it all over again. The following pages discuss SRM  
placement, an in-depth look at polarity and Smart  
Protect, technical information and more. Check it out!  
The high pass mode allows you to choose from a list  
of presets for SRM loudspeakers, as noted below.  
This optimizes the subwoofer and loudspeakers  
connected to the SRM high pass outputs. If not using  
SRM loudspeakers, a variable mode allows you to select  
the best high pass mode suited for your PA system from  
60 Hz to 120 Hz.  
10  
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Placement  
The Ins and Outs of Polarity  
SRM subwoofers are designed to sit on the floor  
or stage. They are not designed to be pole-mounted  
or suspended.  
SRM 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 subwoofers are stabilized and secured from falling  
over or being accidentally pushed over.  
Please note that SRM750 loudspeakers  
should be stacked, not pole-mounted.  
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.  
Speaking of stacking, SRM2850 subwoofers have  
footholes located on the top of each cabinet. While we  
realize that crowds will fall head over heels at their  
beauty, believe it or not, these footholes do indeed serve  
a purpose.  
When the normal/invert [polarity] switch [4] 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.  
Should you decide to stack an additional SRM2850 –  
creating a monster PA – the feet located on the bottom  
of each subwoofer line up nicely with the footholes  
located on the top of each subwoofer. The same can be  
said of the four feet of an SRM750 and the four footholes  
located near the center of the SRM2850.  
For either of these stacked scenarios, it is highly  
suggested that straps are utilized. To reiterate, failure  
to follow these precautions may result in damage to  
the equipment, personal injury, or death.  
These cabinets have no rigging points and  
are not suitable for rigging. NEVER attempt  
to suspend an SRM subwoofer by its handles.  
The normal/invert [polarity] switch comes into play  
when the 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. SRM 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.  
Polarity Waveforms  
Figure 1: Normal [0˚]  
<–– Time ––>  
Figure 2: Invert [180˚]  
<–– Time ––>  
11  
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Smart Protect  
AC Power  
There are advanced DSP protection mechanisms  
to safeguard the subwoofers and amplifiers from  
inadvertent damage.  
Be sure the 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.  
The protection circuits are designed to  
protect the subwoofers under reasonable  
and sensible conditions. Should you choose  
Be sure the electrical service can supply enough  
amperage for all the components connected to it.  
to ignore the warning signs [e.g. excessive distortion],  
you can still damage the speaker in the subwoofer  
by overdriving it past the point of amplifier clipping.  
Such damage is beyond the scope of the warranty.  
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.  
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.  
Never remove the ground pin on the power  
cord or any other component of the SRM  
subwoofer. This is very dangerous.  
Overexcursion Protection  
The SRM1850 has a 24 dB/octave high-pass filter  
at 30 Hz, while the SRM2850 has a 24 dB/octave  
high-pass filter at 32 Hz just prior to the low-frequency  
amplifier. This prevents very 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.  
Care and Maintenance  
SRM 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.  
Thermal Protection  
All amplifiers produce heat. SRM subwoofers are  
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.  
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.  
When the amplifier has cooled down to a safe  
operating temperature, the thermal switch resets  
itself, and the subwoofer resumes normal operation.  
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.  
12  
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Appendix A: Service Information  
If you think your subwoofer 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 Running Man logo on the front 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 subwoofer?  
Use an AC line filter or plug the subwoofer into  
a different AC circuit.  
No sound  
• Is the input gain 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 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 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 SRM subwoofers living  
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 SRM 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 SRM 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  
SRM 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 SRM subwoofers. See  
page 7 for a visual representation of daisy-chaining.  
14  
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Appendix C: Technical Information  
SRM Subwoofer Specifications  
Acoustic Performance:  
Safety Features  
Frequency Response (–3 dB)  
40 Hz – 120 Hz [SRM1850] Input Protection  
34 Hz – 100 Hz [SRM2850]  
Peak and RMS limiting,  
power supply and amplifier  
thermal protection  
Frequency Response (–10 dB)  
Max peak SPL  
35 Hz – 150 Hz [SRM1850]  
26 Hz – 145 Hz [SRM2850] Display LEDs  
Defeatable front power ON  
(Running Man logo), Front load  
power limiter, High Pass Mode,  
input signal  
132 dB [SRM1850]  
135 dB [SRM2850]  
Crossover Point  
115 Hz plus alignment delay [SRM550]  
115 Hz plus alignment delay [SRM650]  
115 Hz plus alignment delay [SRM750]  
60 Hz – 120 Hz [Variable]  
Construction Features  
Cabinet  
18 mm Poplar plywood  
Slope  
3rd order HP, 4th order LP  
Finish  
High durability black paint  
Handles  
One on each side [SRM1850]  
Two on each side [SRM2850]  
Grille  
Powder-coated 16 gauge steel  
Transducer  
Woofer Diameter  
18 in / 457 mm  
3.0 in / 76 mm  
Voice Coil Diameter  
Physical Properties  
Subwoofer Diaphragm Material  
Magnet Material  
Paper  
SRM1850:  
Height  
Width  
22.5 in / 572 mm  
22.2 in / 565 mm  
23.9 in / 608 mm  
64 lb / 29 kg  
Ferrite  
Depth  
Weight  
SRM2850:  
Height  
24.5 in / 623 mm  
44.0 in / 1117 mm  
24.0 in / 610 mm  
29.5 in / 750 mm  
144 lb / 65.2 kg  
Power Amplifier  
Rated Power  
Width  
800 watts rms  
1600 watts peak  
Depth (without casters)  
Depth (with casters)  
Weight  
Rated THD  
Cooling  
< 1%  
Convection  
Class D  
Design  
Mounting Methods  
SRM subwoofers are designed to sit on the floor or stage.  
They are NOT designed to be pole-mounted or suspended.  
The cabinet has no rigging points and is not suitable for rigging.  
Never attempt to suspend an SRM subwoofer by its handles.  
Input/Output  
Input Type  
Female XLR balanced  
differential (stereo left/right)  
Options  
SRM1850 Cover  
Input Impedance  
Full Range Outputs  
High Pass Outputs  
20 k balanced,  
10 k unbalanced  
P/N 2036809-24  
P/N 2036809-27  
P/N 2035170-01  
Male XLR balanced  
(parallel with inputs – mono)  
SRM2850 Cover  
SPM200 Loudspeaker Pole Mount  
Male XLR 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, 200W  
200 – 240 VAC, 50 – 60 Hz, 200W  
3-pin IEC 250 VAC  
The “Running Man” figure is a registered trademark of LOUD  
Technologies Inc.  
All other brand names mentioned are trademarks or registered  
trademarks of their respective holders, and are hereby  
acknowledged.  
Power Supply Type  
Switchmode  
©2014 LOUD Technologies Inc.  
15  
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SRM1850 Subwoofer Dimensions  
WEIGHT  
64 lb  
29 kg  
22.5 in  
572 mm  
22.2 in  
565 mm  
22.0 in  
23.9 in  
608 mm  
22.8 in  
558 mm  
579 mm  
23.9 in  
16.8 in  
428 mm  
608 mm  
SRM1850 Subwoofer Frequency Response  
+10  
+0  
SRM550 / SRM650  
VARIABLE : HIGH  
VARIABLE : LOW  
-10  
-20  
-30  
20  
200  
2000  
20000  
Frequency Response [Hz]  
16  
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SRM2850 Subwoofer Dimensions  
WEIGHT  
144 lb  
65.2 kg  
24.5 in  
623 mm  
44.0 in  
1117 mm  
24.0 in  
610 mm  
38.4 in  
29.5 in  
750 mm  
976 mm  
SRM2850 Subwoofer Frequency Response  
+10  
+0  
SRM650  
SRM750  
-10  
VARIABLE : 60 Hz  
VARIABLE : 120 Hz  
-20  
-30  
200  
2000  
20  
20000  
Frequency Response [Hz]  
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SRM Subwoofer Block Diagram  
18  
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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?  
• Email us at: [email protected].  
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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