SRM350 2-WAY
ACTIVE LOUDSPEAKER
USER’S MANUAL
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Lend Me Your Ears
Exposure to extremely
high noise levels may
cause permanent hear-
According to OSHA, any exposure in
excess of these permissible limits could
result in some hearing loss. To ensure
ing loss. Individuals vary against potentially dangerous exposure to
considerably in susceptibility to noise-in-
high sound-pressure levels, it is recommend-
duced hearing loss, but nearly everyone will ed that all persons exposed to equipment
lose some hearing if exposed to sufficiently
intense noise for a period of time. The U.S.
Government’s Occupational Safety and
Health Administration (OSHA) has speci-
fied the permissible noise level exposures
shown in this chart.
capable of producing these levels use hearing
protectors while this unit is in operation.
Ear plugs or protectors in the ear canals or
over the ears must be worn when operating
this amplification system in order to prevent
a permanent hearing loss if exposure is in
excess of the limits set forth here.
Duration Per Day Sound Level dBA, Typical
In Hours
Slow Response
Example
Duo in small club
8
6
90
92
4
3
95
97
Subway Train
2
1.5
1
0.5
100
102
105
110
115
Very loud classical music
The SRM350
can produce a
maximum SPL
of 121 dB @ 1m.
Tami screaming at Adrian about deadlines
Loudest parts at a rock concert
0.25 or less
CONTENTS
IMPORTANT SAFETY INSTRUCTIONS ..................... 2
INTRODUCTION....................................................... 4
HOOKUP DIAGRAMS............................................... 6
Quick Start........................................................ 6
REAR PANEL DESCRIPTION .................................... 8
IEC Socket .................................................. 8
POWER Switch ............................................ 8
POWER Indicator ......................................... 8
CONTOUR .................................................. 8
LEVEL ......................................................... 8
MIC/LINE Switch......................................... 9
SIGNAL Indicator ........................................ 9
LIMIT Indicator ............................................ 9
INPUT Connector ........................................ 9
THRU Connector ......................................... 9
Accessory Plate .......................................... 9
CONNECTIONS...................................................... 10
PLACEMENT .......................................................... 10
THERMAL CONSIDERATIONS ................................ 12
AC POWER CONSIDERATIONS .............................. 12
SERVICE INFORMATION ........................................ 14
Warranty Service ............................................. 14
Troubleshooting............................................... 14
Repair ............................................................. 16
CARE AND MAINTENANCE.................................... 16
SRM350 SPECIFICATIONS..................................... 17
SRM350 BLOCK DIAGRAM .................................... 18
SRM350 LIMITED WARRANTY ............................... 19
for more information about these and other Mackie products.
Part No. 0008034-90 Rev. C 09/05
©2003-2005 LOUD Technologies Inc. All Rights Reserved.
3
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INTRODUCTION
Thank you for choosing LOUD Technologies’ Power Amplifiers
Mackie active sound reinforcement speakers.
To power these beautiful things, each
The SRM350 is an active two-way loud-
speaker capable of extremely high sound
pressure levels, and designed to give you the
best performance of any loudspeaker in its
class and price range.
When we designed the SRM350s older
sibling, the SRM450, our goal was to build
a sound reinforcement speaker with the
same fidelity and precision found in our re-
knowned HR824 studio monitors.
Apparently, people liked what they heard.
Now, our goal for the SRM350 is to make
the sound even better with improved active
electronics, but delivered in a more compact
size. We think you’ll agree that the SRM350
sound quality and accuracy reaches this
goal and more. The result is a compact
sound reinforcement system equally at
home in a concert setting, in the studio, im-
promptu concerts on the studio roof, in the
cinema, or in a home theater.
SRM350 includes two power amplifiers.
They include the following features:
• The low-frequency amplifier produces
165 continuous watts before clipping.
• The high-frequency amplifier produces
30 continuous watts before clipping.
• Both amplifiers are a Class H design,
which uses a dual power supply for
improved power and thermal efficiency.
The amplifiers operate on the lower
voltage rails until the signal requires
more power, at which point the high
voltage rails seamlessly kick in to
provide additional power.
• An Active Protection Management
System monitors the output levels from
both amplifiers as well as the operating
temperature of the amplifiers. When the
output from either amplifier begins to
clip, a limiter gently reduces the input
signal level until the output is no longer
clipping. Likewise, if the temperature of
either of the amplifers begins to exceed
a safe operating level, the input signal is
elegantly adjusted to keep the tempera-
ture at a desired operating level.
• The low-frequency amplifier also has a
Dynamic Bass Boost circuit. Our ears
are more sensitive to bass frequencies at
high volume levels than at softer vol-
umes. This unique circuit automatically
reduces the low frequencies below 70
Hz as the volume of the speakers goes
up. This results in improved efficiency
for the low-frequency amplifier because
it is not wasting power trying to repro-
duce frequencies we hear better at loud
volumes. Instead, the power is used for
the frequencies where it is needed,
resulting in a louder sound.
The Transducers
The SRM350 active speakers feature a 10˝
high-power low-frequency woofer and a 1.4˝
titanium diaphragm high-output precision
compression driver. This high- frequency
driver is mounted on an acoustically non-
resonant exponential waveguide, providing
a wide, controlled dispersion and precise re-
production of the critical upper mid-range
and high frequencies. The result is an unbe-
lievably smooth off-axis response that
allows everyone in the audience to experi-
ence the same high-resolution audio no
matter where they are seated.
Each driver has been specifically designed
by our engineers for optimum performance
in the lightweight high-strength cabinet.
Warning: Although the
amplifiers have these
protection circuits, you
must still make sure the
LIMIT light is not blink-
ing continuously. If it is, turn down your
mixer faders, or preamplifier gain, or turn
down the SRM350 LEVEL control.
4
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The Crossover
The Active Advantage
There are a number of advantages to us-
ing an active speaker system over a passive
The built-in electronic crossover is a
24 dB/octave Linkwitz-Riley design. Although
more expensive than other crossover designs, loudspeaker:
the benefits provided by the Linkwitz-Riley
design have been well documented. These
benefits include:
• Absolutely flat frequency response
throughout the bandpass, without the
characteristic ripple near the crossover
point exhibited by other designs.
• The sharp 24 dB per octave roll-off of
the filters ensures that the transducers
aren’t reproducing frequencies outside
of their capabilities.
• The acoustic sum of the two driver
responses is unity at the crossover
frequency, resulting in perfect power
response.
•
The internal crossover is active, and its
low power circuitry operates on line-
level signals. It does not waste
speaker-level power like a passive
crossover with large coils, caps, and
resistors.
The input signals are crossed over
before they reach the amplifiers, so each
amplifier only receives the correct
frequency range for its driver.
The amplifiers are designed specifically
for these speaker load impedances.
There is no guesswork as to what load
each amplifier has to drive, so they can
provide maximum acoustic output from
the speakers, yet minimize the danger of
speaker damage due to overdriving a
lesser amplifier.
The connecting wires between the
amplifier outputs and the drivers are
kept to a minimum, so the damping
factor of the amplifier isn’t compro-
mised by the resistance of long speaker
cables. In addition, all the power from
the amplifier is transferred directly to
the drivers with no speaker cable losses.
•
•
• Our heroic engineers have worked
carefully to ensure that the SRM350
also provides perfect phase response.
This diligence has yielded phenomenal
accuracy, even if you are standing 20
feet away.
•
The Cabinet
The SRM350 cabinet was designed to be
the strongest molded composite cabinet on
the planet. This material is as strong as con-
crete, and rigid enough to prevent unwanted
vibrations in the cabinet. An optional
bracket kit is available for the top and bot-
tom of the cabinet to be used for flying, and
a socket is provided in the bottom of the
cabinet for mounting on a tripod stand.
Although it is an exceptional choice for in-
stalled sound situations, its light weight and
durable finish also make it ideal for portable
sound system use. The asymmetrical trap-
ezoidal design of the cabinet makes it easy
to use as a floor wedge for stage monitor
applications.
•
•
The acoustic sum of the outputs from
the two drivers is optimized electroni-
cally, as well as physically, so the
amplitude response is flat and there is
no lobing error.
The presence of active circuits within
the speaker cabinet allow the designer
to add on extra details, such as a high
quality mic/line input section and
optional accessory modules.
In short, all the complex interconnected
components in the system are designed to
work in harmony with each other to pro-
duce the best possible sound.
5
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HOOKUP DIAGRAMS
Quick Start
1. Start with the following settings on the
back of the SRM350:
out, and accepts direct connections from
dynamic microphones with the MIC/
LINE switch pushed in.
Turn the POWER switch off (down).
3. Connect the supplied AC power cord to
the IEC socket on the back of the
Set the CONTOUR and MIC/LINE
switches out. If using a microphone as
the input to the SRM350, push the MIC/
LINE switch in.
SRM350. Plug the other end into an AC
outlet properly configured with the
correct voltage for your particular model.
4. Turn on your signal source. Make sure its
Master Volume control (if it has one) is
turned all the way down.
WARNING: Turn the
LEVEL control down
(counterclockwise)
5. Turn on the SRM350 POWER switch.
before every use. If not,
6. Start the signal source, whether it be
speaking into a microphone or starting a
CD player. Adjust any volume controls on
the signal source for normal operation.
7. Slowly turn up the LEVEL control on
the back of the SRM350 until the
desired volume is reached (and the
LIMIT light does not come on). Always
wear hearing protectors if you are close
when it is playing at high levels.
8. If there is no sound, always turn down
the SRM350 LEVEL control before
investigating. There may be a mixer or
preamplifier mute or tape switch
engaged, or a mic switch off.
you could be in for a
startling surprise, especially if the last
time you used it was with a microphone
and now you want to connect a line-
level source.
2. Connect the output from your signal
source (mixing console, microphone,
preamp, or other mic- or line-level
source) directly to the INPUT connector
on the back of the SRM350. This is a
combination XLR and 1/4˝ TRS con-
nector, and accepts balanced or
unbalanced line-level signals from
mixers, preamplifiers, CD players, tape
decks, etc., with the MIC/LINE switch
SRM350
ACTIVE SOUND REINFORCEMENT SYSTEM
SIGNAL
LIMIT
SRM350
ACTIVE SOUND REINFORCEMENT SYSTEM
POWER
LIMIT
POWER
SIGNAL
THRU
THRU
NORMAL
NORMAL
ON
ON
+45
+5dB
+45
+5dB
O O
O O
LEVEL
LEVEL
LINE
MIC
LINE
MIC
100Hz
12k/AIR
100Hz
12k/AIR
~120 VAC 60Hz
2.50A 230VA
CONTOUR
(+3dB)
~120 VAC 60Hz
2.50A 230VA
CONTOUR
(+3dB)
DESIGNED BY MACKOIDS IN WOODINVILLE, WA, USA
AND REGGIO EMILIA, ITALY.
DESIGNED BY MACKOIDS IN WOODINVILLE, WA, USA
AND REGGIO EMILIA, ITALY.
Left
Right
Line level
Output
Line level
Output
1202-VLZPRO
Mixer or
Preamplifier
SRM350: STEREO OPERATION WITH A MIXER
6
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Next
SRM350
ACTIVE SOUND REINFORCEMENT SYSTEM
SIGNAL
LIMIT
SRM350
ACTIVE SOUND REINFORCEMENT SYSTEM
SIGNAL
LIMIT
SRM350
ACTIVE SOUND REINFORCEMENT SYSTEM
SIGNAL
LIMIT
SRM350
ACTIVE SOUND REINFORCEMENT SYSTEM
SIGNAL
LIMIT
POWER
POWER
POWER
POWER
THRU
THRU
N
NORM
NORMAL
NORMAL
ON
ON
ON
ON
Next
+45
+45
+45
+
+
O
O
O
O
O
O
O
O
+5dB
+5dB
+5dB
LEVEL
LEVEL
LEVEL
I
INPUT
LINE
MIC
LINE
MIC
LINE
MIC
LINE
MIC
100Hz
12k/AIR
100Hz
12k/AIR
100Hz
12k/AIR
100Hz
12k/AIR
~120 VAC 60Hz
2.50A 230VA
CONTOUR
(+3dB)
~120 VAC 60Hz
2.50A 230VA
CONTOUR
(+3dB)
~120 VAC 60Hz
2.50A 230VA
CONTOUR
(+3dB)
~120 VAC 60Hz
2.50A 230VA
CONTOUR
(+3dB)
DESIGNED BY MACKOIDS IN WOODINVILLE, WA, USA
AND REGGIO EMILIA, ITALY.
DESIGNED BY MACKOIDS IN WOODINVILLE, WA, USA
AND REGGIO EMILIA, ITALY.
DESIGNED BY MACKOIDS IN WOODINVILLE, WA, USA
AND REGGIO EMILIA, ITALY.
DESIGNED BY MACKOIDS IN WOODINVILLE, WA, USA
AND REGGIO EMILIA, ITALY.
Thru
Thru
SRM350
ACTIVE SOUND REINFORCEMENT SYSTEM
SRM350
POWER
ACTIVE SOUND REINFORCEMENT SYSTEM
SIGNAL
LIMIT
POWER
SIGNAL
LIMIT
THRU
U
NORMAL
NORMAL
ON
ON
+45
+5dB
+45
+5dB
O O
O O
LEVEL
LEVEL
LINE
MIC
LINE
MIC
100Hz
12k/AIR
100Hz
12k/AIR
~120 VAC 60Hz
2.50A 230VA
CONTOUR
(+3dB)
~120 VAC 60Hz
2.50A 230VA
CONTOUR
(+3dB)
DESIGNED BY MACKOIDS IN WOODINVILLE, WA, USA
AND REGGIO EMILIA, ITALY.
DESIGNED BY MACKOIDS IN WOODINVILLE, WA, USA
AND REGGIO EMILIA, ITALY.
1202-VLZPRO
SRM350: DAISY-CHAINING USING THE THRU JACK
The SRM350 can be
used with a Mackie
SWA1501 or SWA1801
subwoofer to create an
incredibly powerful
system.
The active crossover
inside the subwoofer
splits the full range in-
put signal into two
ranges. The subwoofer
plays the low frequency
range through its built-
in amplifier and woofer,
and sends the high-pass
range to the SRM350.
The SRM350 can be
pole mounted on top of
the SWA1501 or 1801
as shown.
Pole
Pole
Power
Cord
Power
Cord
Mount
Mount
Line-level
Hi-pass
out
Line-level
ACTIVE
ACTIVE
Hi-pass
out
Full
Full
Range
Range
1202-VLZPRO
Power
Cords
Power
Cords
SWA1501
plays the low
frequencies
SWA1501
plays the low
frequencies
SRM350: BIAMPING WITH A POWERED SUBWOOFER
7
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REAR PANEL DESCRIPTION
The SRM350 has several connectors,
controls, and indicators that you should
understand.
CONTOUR
Pushing in this switch engages a filter
that provides 3 dB of boost to the low and
high frequencies (below 100 Hz and above
12 kHz). This provides a punchy, crisp
sound for most live music applications. You
can experiment with this switch by leaving
it out for a while, then pushing it in to de-
termine which way sounds best for your
application. It is especially useful when lis-
tening at lower volumes, as it highlights the
bass like a Loudness switch, in addition to
boosting the highs.
IEC Socket
This is where you connect the supplied
AC linecord to provide AC power to the
SRM350’s built-in power amplifiers. Plug
the linecord into an AC socket properly
configured for your particular model.
Note: If you happen to lose the AC line-
cord, replacements are readily available at
any office or computer supply store. Always
use a three-pin plug with a ground pin.
LEVEL
POWER Switch
This is used to adjust the signal level, going
into the built-in power amplifiers, from Off
up to 45 dB of gain. Since the SRM350 in-
corporates Mackie’s world-class low-noise
mic preamp technology, you can connect
either a line-level or a microphone-level
signal to the input, and use this control to
adjust the level correctly.
Switch up to turn the SRM350 on, and
switch down to turn it off. Make sure the
LEVEL control is down before you turn it on.
POWER Indicator
When the POWER switch is turned on,
and the linecord is connected to an active
AC Mains supply, this indicator, located
just above the POWER switch, glows to let
you know that you’re ready to rock and
roll. The cool blue LED on the front of the
speaker works in the same way.
There is no phantom
power for a microphone,
so you should use a
dynamic mic, or use a
condensor type if it has its
own battery power.
SRM30
ACTIVE SND REINFORCENT SYSTEM
LIMIT
POWER
SIGNAL
THRU
NORMAL
ON
+45
+5dB
O O
LEVEL
INPUT
LINE
MIC
100Hz
12k/AIR
~120 VAC 60Hz
2.50A 230VA
CONTOUR
DESIGNED BY MACKOIDS IN WOODINVILLE, WA, USA
AND REGGIO EMILIA, ITALY.
(+3dB)
8
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Follow the Quick Start guide on page 6
for setting the LEVEL control. For most ap-
plications, it will be in the NORMAL
position (12 o’clock) . If you have a particu-
larly high line-level signal connected to the
SRM350, you may need to turn the control
down to the 9 o’clock position. If you have
a low line-level or mic-level signal con-
nected, you may need to turn the LEVEL
control up to the 3 o’clock position.
INPUT Connector
This is a combination female XLR-type
and 1/4˝ TRS connector that accepts a bal-
anced or unbalanced mic- or line-level signal.
THRU Connector
This is a male XLR-type connector that
can be used to daisy-chain the input signal
to another speaker.
The signal at this point is after the MIC/
LINE switch but before the LEVEL control.
If you have a microphone connected to the
first SRM350 and you have the MIC/LINE
switch pushed in, the signal at the THRU
jack is boosted 40 dB to a line-level, so leave
the MIC/LINE switch out on the next
SRM350.
MIC/LINE Switch
Leave this switch out when connecting a
line-level signal to the INPUT connector
(from a mixer, graphic EQ, or other line-
level signal source).
Push this switch in when connecting a
microphone to the INPUT connector. Since
a microphone produces a much smaller sig-
nal than a line-level signal, this provides an
additional 40 dB of gain to boost the micro-
phone signal to a line level.
ACCESSORY Plate
This removable plate provides access to
install future accessory modules.
SIGNAL Indicator
This LED illuminates whenever there is
a signal present at the INPUT connector on
the rear panel. It senses the signal just after
the LEVEL control, so if the LEVEL control
is turned down, the SIGNAL indicator
won’t light.
WARNING: SHOCK, DO NOT
EXPOSE THIS EQUIPM. REMOVE COVER.
NO USER SERVICEABLE PARTI. CO QUALIFIED PERSONNEL.
LIMIT Indicator
When the signal levels at the amplifier
outputs approach clipping, a soft limiting
circuit is activated that reduces the input
signal. The LIMIT LED lights whenever the
limit circuit is active.
It’s okay for the LIMIT indicator to blink
occasionally, but if it blinks frequently or
continuously, either turn down the signal
level at the mixer or other signal source, or
turn down the SRM350’s LEVEL control.
Wear hearing protection if
you are close to the
SRM350 playing at high
levels.
SRM350
POWER
ACTIVE SOUND REINFORCEMENT SYSTEM
SIGNAL
LIMIT
THRU
NORMAL
ON
+45
+5dB
O O
LEVEL
INPUT
LINE
MIC
100Hz
12k/AIR
~120 VAC 60Hz
2.50A 230VA
CONTOUR
(+3dB)
DESIGNED BY MACKOIDS IN WOODINVILLE, WA, USA
AND REGGIO EMILIA, ITALY. MANUFACTURED IN ITALY
9
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CONNECTIONS
PLACEMENT
The SRM350 active speakers are designed
to sit on the floor, a tabletop, or to fit on a
standard tripod speaker stand. They can also
be suspended by the rigging points, which
requires installing the optional hanging
bracket on the top and/or bottom of the
cabinet. NEVER attempt to suspend the
SRM350 active speakers by their handles.
You can lay the cabinet down on its side
and use the SRM350 as a floor monitor. The
asymmetrical trapezoidal shape of the cabinet
provides a perfect angle for aiming up toward
performers from the front of the stage.
The SRM350 has a combination female
XLR and 1/4˝ TRS input that accepts a
balanced or unbalanced mic- or line-level
signal. When connecting a balanced signal,
be sure it’s wired per AES (Audio Engi-
neering Society) standards:
XLR TRS
Pin 2 Tip
Hot (+)
Cold (–)
Shield (Ground)
Pin 3 Ring
Pin 1 Shield
There is also a male XLR connector la-
beled THRU. This allows you to connect
more than one SRM350 to the output of
your mixing console. Simply plug the signal
source output into the first INPUT jack,
and patch that speaker’s THRU jack to the
next INPUT jack, and so on, daisy-chaining
multiple speakers (see diagram on page 7).
As with any powered
components, protect
them from moisture. If
The THRU jack’s signal
comes after the MIC/LINE
switch, but before the
you are setting them up
LEVEL control. If the
outdoors, make sure they
are under cover if you expect rain.
MIC/LINE switch is
pushed in on the first
SRM350, the signal at the THRU jack is
boosted by 40 dB to a line level. Therefore,
leave the MIC/LINE switch out on the fol-
lowing SRM350s in the chain.
The SRM350 generates
magnetic fields. Place it
at least two feet (0.6
meters) or more from
computer monitors.
Check the screen for any change in color or
distortion. Do not place any magnetic audio
or video tapes or computer discs near the
SRM350s.
Room Acoustics
The SRM350 active speakers are de-
signed to sound as neutral as possible; that
is, to reproduce the input signal as accu-
rately as possible, monitoring the sound
rather than changing it.
Room acoustics play a crucial role in the
overall performance of a sound system.
However, the wide high-frequency disper-
sion of the SRM350 helps to minimize the
problems that typically arise.
Balanced XLR Connectors
RING SLEEVE
TIP
SLEEVE RING TIP
RING (COLD)
Top
TIP (HOT)
SLEEVE
(SHIELD)
0
90
Balanced TRS Connectors
0
90 Dispersion
10
up to 20 kHz
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Here are some useful placement tips:
• Avoid placing loudspeakers in the
corners of a room. This increases the
RIGGING
The SRM350 cabinets are fitted with
low-frequency output and can cause the four M5 insert points on the top and bot-
sound to be muddy and indistinct.
tom for installing an optional hanging
bracket that allows the speaker to be flown.
SRM350 Bracket Kit: Part No. 0016404
• Avoid placing loudspeakers against a wall.
This, too, increases the low-frequency
output, though not as much as corner
placement. However, if you do need to
reinforce the low frequencies, this is a
good way to do it.
WARNING: Never at-
tempt to suspend the
SRM350 active speakers
by their handles. If you
want to suspend them,
•
Avoid placing the active speakers directly
on a hollow stage floor. A hollow stage can
resonate at certain frequencies, causing
peaks and dips in the frequency response
of the room. It’s better to place the active
speakers on a sturdy table or tripod stands.
use the hanging brackets only.
M5 inserts for mounting
optional hanging bracket
•
Position the active speakers so the high-
frequency drivers are 2 to 4 feet above ear
level for the audience (make allowances for
a standing/dancing in the aisles audience).
High frequencies are highly directional and
tend to be absorbed much easier than
Pole
lower frequencies. By providing direct line-
of-sight from the active speakers to the
audience, you increase the overall bright-
ness and intelligibility of the sound system.
Mount
Top
Bottom
If you are hanging them
in an inaccessable place,
such as over a lion’s cage,
make sure that you first
complete the sound check
• Highly reverberant rooms, like many
gymnasiums and auditoriums, are a
nightmare for sound system intelligibility.
Multiple reflections off the hard walls,
ceiling, and floor play havoc with the
sound. Depending on the situation, you
may be able to take some steps to mini-
mize the reflections, such as putting
carpeting on the floors, closing draperies
to cover large glass windows, or hanging
tapestries or other materials on the walls
to absorb some of the sound.
and set the SRM350 LEVEL correctly.
However, in most cases, these remedies are
not possible or practical. So what do you
do? Making the sound system louder
generally doesn’t work because the reflec-
tions become louder, too. The best approach
is to provide as much direct sound coverage
to the audience as possible. The farther
away you are from the speaker, the more
prominent will be the reflected sound.
Use more speakers strategically placed so
they are closer to the back of the audience.
If the distance between the front and back
speakers is more than about 100 feet, you
should use a delay processor to time-align
the sound. (Since sound travels about 1
foot per millisecond, it takes about 1/10 of
a second to travel 100 feet).
11
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THERMAL
AC POWER
CONSIDERATIONS
CONSIDERATIONS
The amplifiers inside the
SRM350 are convection
cooled by a large
Be sure the SRM350 is plugged into an
outlet that is able to supply the correct volt-
age specified for your model. If the voltage
should drop below 97% of the specified line
heatsink. For efficient
cooling, it is important to voltage, the built-in amplifiers will no
allow at least six inches of free space behind longer be able to supply rated power. (They
the SRM350.
will continue to operate down to 75% of
the rated line voltage, but won’t reach full
If the ambient temperature in the room
is high, it could cause the amplifiers to over- power, resulting in lower headroom.)
heat. In this case, you should try aiming a
fan at the heatsink to increase the air flow
through the fins.
During a performance, don’t have it
cranked so high that the rear panel LIMIT
LED is blinking frequently or lighting con-
tinuously. You should turn down the
LEVEL control a notch or two to avoid
Under maximum SPL conditions, where
musical peaks are clipping, the SRM350 120V
model draws 2.5 amps on average (1.3 amps
for the 230V model). Under normal condi-
tions, the current draw is below 1 amp.
We recommend that a stiff (robust) sup-
ply of AC power be used because the
amplifiers place high current demands on
overheating the amplifiers or your neighbors. the AC line. The more power that is avail-
If the amplifiers begin to overheat, the
Active Protection Management System
gently reduces the input signal level until
the amplifiers have cooled down to a safe
operating temperature.
able on the line, the louder the speakers will
play and the more peak output power will
be available for cleaner, punchier bass. A
suspected problem of “poor bass perfor-
mance” is often caused by a weak AC
supply to the amplifiers.
AC Power Distribution
A 240VAC center-tapped service en-
trance transformer serves the majority of
AC outlets encountered in homes and clubs
(in the U.S.). This provides two phases of
AC power on either side of the center tap,
at 120V each.
If lighting is used in a show, it is prefer-
able to power the lights from one leg of the
service, and power the audio equipment
from the other leg. This will help minimize
noise from the lights coupling into the au-
dio (particularly if SCRs, or light-dimmer
switches, are used).
HIGH VOLTAGE POWER LINE
120V
PRIMARY
WINDING
SECONDARY
WINDING
240V
120V
EARTH
GROUND
(NEUTRAL)
TRANSFORMER
240V CENTER-TAPPED SECONDARY
12
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Wherever possible, connect all of your
equipment to the same electrical circuit.
This will help reduce the possibility of a
ground loop problem causing an annoying
hum in your speakers.
Low power components such as tape
decks, mixers, effects processors and CD
players should be connected to the same
outlet as the SRM350s. Use fused power
When setting up for a
show, often you are plug-
ging into an AC power
distribution system you
know nothing about. You
may even be faced with
2-wire outlets that are missing the third
safety ground pin. It’s a good idea to have a
three-wire AC outlet tester in your toolbox
strips as shown in the diagram below. Make so you can check the outlets yourself to
sure that the total current draw of your
components does not exceed the capability
of the outlets and power strips.
make sure they are wired correctly. These
testers will tell you if the polarity of the hot
and neutral wires is reversed and if the
safety ground is disconnected.
Don’t use an outlet if it is
For the US 120 V model:
A maximum of five SRM350s can be
connected per 15A service.
This allows each SRM350 to be safely
operated at its maximum level.
wired improperly! This is
to protect yourself as well
as your equipment.
When turning your system on, turn on
the SRM350s last. This will stop any turn-
on thumps and bangs from your source
equipment being amplified.
When turning off your system, turn off
the SRM350s first. This will prevent any
turn-off thumps and bangs from your
source equipment being amplified.
Never remove the ground
pin on the power cord of
the SRM350 or any other
component. This is very
dangerous.
C
A
U
T
I
O
N
C
A
U
T
I
O
N
RI
NO PEN
RISK
K
NO PEN
O
O
O
O
W
A
RNING:
EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. DO
NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL.
T
O
REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT
W
A
RNING:
T
O
REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT
N
O
T
R
E
M
O
V
E
C
O
V
E
R
.
EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. DO NOT REMOVE COVER.
NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL.
SRM35
POWER
0
ACTIVE SOUND REINFORCEMEN
SIGNAL LIMIT
T
SYSTEM
SRM35
POWER
0
A
C
T
I
V
E
S
O
U
N
D
R
E
I
N
F
O
R
C
E
M
E
N
T
S
Y
S
T
E
M
S
I
G
N
A
L
L
I
M
I
T
THRU
THRU
N
O
R
M
A
L
NORMAL
ON
ON
+
4
5
+45
5d
O
O
O
O
+
5
d
B
+
B
LEVEL
LEVEL
INPUT
INPUT
10
0
H
z
1
2
k
/AIR
LINE
MIC
10
0
H
z
1
2
k
/AIR
LINE
MIC
~120 VAC 60Hz
2.50A 230VA
CONTOUR
(+3dB)
~120 VAC 60Hz
2.50A 230VA
CONTOUR
(+3dB)
DESIGNED BY MACKOIDS IN WOODINVILLE, WA, USA
AND REGGIO EMILIA, ITALY.
DESIGNED BY MACKOIDS IN WOODINVILLE, WA, USA
AND REGGIO EMILIA, ITALY.
SRM350: AC CONNECTIONS
13
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SERVICE INFORMATION
Warranty Service
No sound!
• Is the input LEVEL control turned all
the way down? Follow the procedures
in the “Quick Start” section on page 6
to verify that all the volume controls in
the system are properly adjusted.
• Is the signal source working (and making
union scale)? Make sure the connecting
cables are in good repair and securely
connected at both ends. Make sure the
output volume (gain) control on the
mixing console or preamp is turned up
sufficiently to drive the inputs of the
speaker. You should be able to see the
SIGNAL LED blink on the rear panel.
• Make sure the preamp or mixer does
not have a Mute on, or a Tape or
Processor loop engaged. If you find
something like this, make sure the
volume/gain is turned down before
disengaging the offending switch.
Details concerning Warranty Service are
spelled out on page 19 of this manual.
If you think your loudspeaker has a
problem, please do everything you can to
confirm it before calling for service, includ-
ing reading through the following
troubleshooting section. Doing so might
save you from being deprived of your
Mackie loudspeaker.
If you do find the prob-
lem, make sure that you
turn down the LEVEL
controls and turn off the
SRM350 before correct-
ing it or changing any connections.
Of all Mackie products returned for ser-
vice (which is hardly any at all), many are
coded “CND” — Could Not Duplicate—
which usually means the problem lay some-
where else in the system. The following
troubleshooting tips may sound obvious,
but here are some things you can check:
One side is way louder than the other!
• Are the LEVEL controls set the same on
both active speakers?
Troubleshooting
No power!
• Check the PAN control or balance on
the signal source. It may be turned too
far to one side. If you’re using a stereo
signal source, it may be delivering an
out-of-balance stereo signal.
• Try swapping sides: Turn off the active
speakers, swap the input cables coming
from the mixing console, turn the active
speakers back on. If the same side is still
louder, the problem may be with your
active speakers or cables between the
mixer and the active speaker. If the
•
•
•
Our favorite question: Is it plugged in?
Make sure the AC outlet is live (check
with a tester or lamp).
Our next favorite question: Is the
POWER switch on? If not, try turning
it on.
Is the blue light on the front panel
illuminated? If not, make sure the AC
outlet is live. If so, refer to “No sound”
below.
other side is louder now, the problem is
with the mixer or the signal source.
•
The AC line fuse inside the chassis is
blown. This is not a user-serviceable
part. Refer to “Repair” on page 16 to
find out how to proceed.
Poor bass performance
• Check the polarity of the connections
between the mixer/preamp and the
active speakers. You may have your
positive and negative connections
reversed at one end of one cable, causing
one SRM350 to be out-of-phase.
14
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Bad sound!
• Is it loud and distorted? Follow the
procedures described in the “Quick
Start” section to verify that the levels
are set properly.
• Is the input connector plugged com-
pletely into the jack? Be sure all
connections are secure. It’s a good idea
to periodically clean all electrical
connections with a non-lubricating
electrical contact cleaner.
Use an interconnect cable wired as
shown below. The important point is
that the shield and the wire from the
XLR pin 3 are joined at the RCA
(source) end.
RCA
XLR
3-Conductor Cable
2
1
3
shield
•
Disconnect any cables which come in
Noise
from outside, such as cable TV, satellite
TV or roof top antennas. They must be
disconnected from every part of your
system, such as the TV, VCR and
preamp. If the hum goes away, you can
add a “ground loop isolator” in your
• Make sure all connections to the active
speakers are good.
• Make sure none of the signal cables are
routed near AC cables, power trans-
formers, or other EMI-inducing devices.
• Is there a light dimmer or other SCR-
based device on the same AC circuit as
the SRM350? Use an AC line filter or
plug the SRM350 into a different AC
circuit.
cable line. This is an inexpensive device
available from video or TV dealers, or
you can make your own from two TV
baluns (standard TV 75/300 ohm
adaptors):
Hum
• Turn the LEVEL control all the way
down. If the noise disappears, it’s
coming from the signal source. If not,
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 SRM350. Try some
of the following troubleshooting ideas:
join (+insulate)
Balun
Balun
The baluns are threaded at one end
(75 ohm) to fit TV coax cable and have
two wires at the other end (300 ohm).
They will not affect the video quality.
•
•
If the hum persists, try removing compo-
nents one at a time from the back of the
mixer or preamplifier, and check for hum
each time (turn off your equipment
before you undo any connections). It is
fairly common to find more than one
problem.
If your preamp or mixer are the only
things connected to the SRM350s and
the hum is still there, try different
connection cables, or move the preamp/
mixer to another location.
• Use balanced connections throughout
your system for the best noise rejection.
• Whenever possible, plug all the audio
equipment’s linecords into outlets which
share a common ground (see the dia-
gram on page 13). The distance between
the outlets and the common ground
should be as short as possible.
Never remove the ground
pin on the power cord of
the SRM350 or any other
component. This is very
dangerous.
• The hum may appear when using an
unbalanced source (consumer preamp,
CD player, VCR, etc.). This is caused by
the unbalanced-to-balanced interface
between the devices (and exacerbated
by the fact that most consumer audio
equipment have a two-wire linecord,
without the third-pin safety ground).
15
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Repair
Service for Mackie products is available
8. We’ll try to fix the loudspeaker within
five business days. Once it is repaired,
we’ll ship it back the same way in which
it was received. This paragraph does not
necessarily apply to non-warranty
service.
at a factory-authorized service center. Ser-
vice for Mackie products living outside the
United States can be obtained through local
dealers or distributors.
If your SRM350 needs service, please fol-
low these instructions:
1. Review the preceding troubleshooting
suggestions. Please.
2. Call Tech Support at 1-800-898-3211,
8am to 5pm PST, to explain the problem
in detail. If it appears that the SRM350
needs repair, you will be given a Service
Request Number. Have your
Note: Under the terms of the warranty,
you must ship or drop-off the unit to an
authorized service center. The return
ground shipment is covered for those
deemed by us to be under warranty.
Note: You must have a sales receipt
from an Authorized Mackie Dealer to
qualify for a warranty repair.
loudspeaker’s serial number ready. You
must have an Service Request Number
before you can obtain service at a
CARE AND
factory-authorized service center.
MAINTENANCE
3. Keep this user’s manual and the detach-
able linecord. We don’t need them to
repair the loudspeaker.
Your Mackie active speakers will provide
many years of reliable service if you follow
these guidelines:
4. Pack the loudspeaker in its original
package, including endcaps and box.
This is VERY IMPORTANT. When
you call for the Service Request Num-
ber, please let Tech Support know if you
need new packaging. Mackie is not
responsible for any damage that occurs
due to non-factory packaging.
Avoid exposing the active
speakers to moisture. If
they are set up outdoors,
be sure they are under
cover if you expect rain
or you live in Washington.
5. Include a legible note stating your name,
shipping address (no P.O. boxes),
daytime phone number, Service Request
Number, and a detailed description of
the problem, including how we can
duplicate it.
6. Write the Service Request Number in
BIG PRINT on top of the box. Prod-
uct shipped without the Service Request
Number will be refused.
• Avoid exposure to extreme cold (below
freezing temperatures). If you must
operate the active speakers 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.
• Use a slighty damp cloth with a mild
soap solution 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.
7. Tech Support will tell you where to ship
the loudspeaker for repair. We suggest
insurance for all forms of cartage.
Need Help?
You can reach a technical support representative
Monday through Friday
from 7 AM to 5 PM PST at:
1-800-898-3211
or email us at: [email protected]
16
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SRM350 SPECIFICATIONS
Horn Design
Horizontal Coverage
90º (1 kHz - 20 kHz)
Vertical Coverage
80º (1 kHz - 20 kHz)
Mouth Size
11.1 in x 6.1 in (283 mm x 154 mm)
Enclosure Construction Features
System Specifications
Frequency Response (–3 dB)
83 Hz - 18.5 kHz
Frequency Range (–10 dB)
61 Hz - 22 kHz
Max SPL Long-Term @ 1m
Max SPL Peak @ 1m
118 dB
121 dB
Basic Design
Material
Finish
Handles
Grille
Asymmetrical Trapezoidal
Polypropylene
Grey textured finish
One on side, one on top
Perforated metal with
weather-resistant coating
Crossover
Linkwitz-Riley
24 dB/octave @ 2400 Hz
Audio
Input Type
Input Impedance
Balanced Differential
94k ohms
Line Input Power
Sensitivity (center detent)
Line:
Mic:
+4 dBu
–36 dBu
Power Consumption
120 watts with musical
program and LIMIT
LED blinking
Maximum Input Level +22 dBu
Acoustic Contour Equalization (peaking)
+3 dB @ 100 Hz,
US
120 VAC, 60 Hz
Recommended Amperage Service 2.5 amps
Europe 230 VAC, 50 Hz
Recommended Amperage Service 1.25 amps
Japan 100 VAC, 50/60 Hz
Recommended Amperage Service 3.0 amps
+3 dB @ 12 kHz
15 VDC,
normalized signal I/O
Accessory Interface
Operating Temperature Range
–10ºC - 45ºC
(14ºF - 113ºF)
AC Connector
3-pin IEC 250 VAC
Control System Functions
Power Amplifiers
Low-Frequency Power Amplifier
Electronic Crossover
Phase Alignment
Equalization
Rated Power
Rated THD
Cooling
165 watts continuous*
< 0.03%
Convection Extrusion
Class H
Parametric Equalization
Safety Features
Design
Protection
Low-frequency Dynamic Bass
Protection, Power Supply, and
Amplifier Thermal Protection
High-Frequency Power Amplifier
Rated Power
Rated THD
Cooling
30 watts continuous*
< 0.03%
Convection Extrusion
Class H
Display LEDs Signal, Power, Limit
Physical Properties
Design
Height
Width
Depth
Weight
20.75 in/527 mm
13.10 in/333 mm
12.25 in/311 mm
32 lb/14.5 kg
* Rated power is continuous rms wattage into
transducer’s rated impedance @ 1 kHz for the HF
amplifier and @ 100 Hz for the LF amplifier.
Mounting Methods
Transducer Specifications
Low-Frequency Transducer
Optional hanging brackets for top and bottom of en-
closure (SRM350 Bracket Kit: Part No. 0016404).
Never attempt to suspend the cabinet by its handles.
The SRM350 is pole-mountable via the built-in
socket on the bottom of the cabinet. Be sure the pole
is capable of supporting the weight of the SRM350.
Diameter
Voice Coil Diameter
10 in/250 mm
2.0 in/51 mm
Sensitivity (1W@1m) 96 dB
Power Handling
Frequency Range
Magnet Type
250 watts rms, long-term
61 Hz - 3 kHz
Ferrite
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.
High-Frequency Transducer
Diaphragm Diameter 1.4 in/36 mm
Horn Exit Diameter
1 in/25.4 mm
Diaphragm Material Titanium
Sensitivity (1W@1m) 104 dB
“Mackie” and the “Running Man” figure are
registered trademarks of LOUD Technologies Inc.
Nominal Impedance
Power Handling
Frequency Range
Magnet Type
16 ohms
75 watts rms, long-term
1 kHz - 20 kHz
Ferrite
All other brand names mentioned are trade-
marks or registered trademarks of their respective
holders, and are hereby acknowledged.
©2004-2005 LOUD Technologies Inc.
All Rights Reserved.
17
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SRM350 BLOCK DIAGRAM
18
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SRM350 LIMITED WARRANTY
Please keep your sales receipt in a safe place.
A. LOUD Technologies Inc. warrants all materials,
workmanship and proper operation of this product
for a period of five years from the original date of
purchase, with the exception of the transducers,
including woofers and compression drivers, which
are warranted for two years from the original date
of purchase. If any defects are found in the materials
or workmanship or if the product fails to function
properly during the applicable warranty period,
LOUD Technologies, at its option, will repair or
replace the product. This warranty applies only to
equipment sold and delivered within the U.S. by
LOUD Technologies Inc. or its authorized dealers.
F. Any products returned to one of the LOUD
Technologies factory-authorized service centers and
deemed eligible for repair or replacement under the
terms of this warranty will be repaired or replaced
within thirty days of receipt by LOUD Technolo-
gies. LOUD Technologies and its authorized service
centers may use refurbished parts for repair or
replacement of any product. Products returned to
LOUD Technologies that do not meet the terms of
this Warranty will not be repaired unless payment is
received for labor, materials, return freight, and
insurance. Products repaired under warranty will
be returned freight prepaid by LOUD Technologies
to any location within the boundaries of the USA.
G. LOUD Technologies warrants all repairs
performed for 90 days or for the remainder of the
warranty period. This warranty does not extend to
damage resulting from improper installation,
misuse, neglect or abuse, or to exterior appearance.
This warranty is recognized only if the inspection
seals and serial number on the unit have not been
defaced or removed.
B. Failure to register online or return the product
registration card will not void the five-year warranty.
C. Service and repairs of Mackie products are to be
performed only at a factory-authorized facility (see D
below). Unauthorized service, repairs, or
modification will void this warranty. To obtain
repairs under warranty, you must have a copy of
your sales receipt from the authorized Mackie
dealer where you purchased the product. It is
necessary to establish purchase date and determine
whether your Mackie product is within the
warranty period.
H. LOUD Technologies assumes no responsibility
for the quality or timeliness of repairs performed by
Authorized Mackie Service Centers.
D. To obtain factory-authorzied service:
I. This warranty is extended to the original
purchaser and to anyone who may subsequently
purchase this product within the applicable
warranty period. A copy of the original sales receipt
is required to obtain warranty repairs.
J. This is your sole warranty. LOUD Technologies
does not authorize any third party, including any
dealer or sales representative, to assume any
liability on behalf of LOUD Technologies or to make
any warranty for LOUD Technologies Inc.
1. Call Mackie Technical Support at 800/898-
3211, 7 AM to 5 PM Monday through Friday
(Pacific Time) to get a Return Authorization (RA).
Products returned without an RA number will be
refused.
2. Pack the product in its original shipping carton.
Do not use “packing peanuts,” shredded
newspapers, or other material with small particles
to pack the product. Please seal the Mackie
product in a plastic bag.
K. THE WARRANTY GIVEN ON THIS PAGE IS THE
SOLE WARRANTY GIVEN BY LOUD TECHNOLOGIES
INC. AND IS IN LIEU OF ALL OTHER WARRANTIES,
EXPRESS AND IMPLIED, INCLUDING THE
WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE. THE
WARRANTY GIVEN ON THIS PAGE SHALL BE
STRICTLY LIMITED IN DURATION TO FIVE YEARS
FROM THE DATE OF ORIGINAL PURCHASE FROM
AN AUTHORIZED MACKIE DEALER. UPON
EXPIRATION OF THE APPLICABLE WARRANTY
PERIOD, LOUD TECHNOLOGIES INC. SHALL
HAVE NO FURTHER WARRANTY OBLIGATION
OF ANY KIND. LOUD TECHNOLOGIES INC.
SHALL NOT BE LIABLE FOR ANY INCIDENTAL,
SPECIAL, OR CONSEQUENTIAL DAMAGES THAT
MAY RESULT FROM ANY DEFECT IN THE
MACKIE PRODUCT OR ANY WARRANTY CLAIM.
Some states do not allow exclusion or limitation of
incidental, special, or consequential damages or a
limitation on how long warranties last, so some of
the above limitations and exclusions may not apply
to you. This warranty provides specific legal rights
and you may have other rights which vary from
state to state.
3. Also include a note explaining exactly how to
duplicate the problem, a copy of the sales receipt
with price and date showing, and your return
street address (no P.O. boxes or route numbers,
please!). If we cannot duplicate the problem or
establish the starting date of your Limited
Warranty, we may, at our option, charge for
service time.
4. Tech Support will tell you where to ship the
product. Ship it freight prepaid in its original
shipping carton.
IMPORTANT: Make sure that the Service
Request Number is plainly written on the
shipping carton.
E. LOUD Technologies reserves the right to inspect
any products that may be the subject of any
warranty claims before repair or replacement is
carried out. LOUD Technologies may, at our option,
require proof of the original date of purchase in the
form of a dated copy of the original dealer’s invoice
or sales receipt. Final determination of warranty
coverage lies solely with LOUD Technologies.
19
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16220 Wood-Red Road NE • Woodinville, WA 98072 • USA
United States and Canada: 800.898.3211
Europe, Asia, Central and South America: 425.487.4333
Middle East and Africa: 31.20.654.4000
E-mail: [email protected]
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