SRM450v2
Powered Loudspeaker
O W N E R ’ S M A N U A L
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Contents
IMPORTANT SAFETY INSTRUCTIONS .......................................2
INTRODUCTION.......................................................................4
HOOKUP DIAGRAMS..............................................................6
Quick Start ......................................................................6
REAR PANEL DESCRIPTION......................................................8
1. IEC Socket....................................................................8
2. POWER Switch ............................................................8
3. POWER ON Indicator ..................................................8
4. TIMED TURNOFF ..........................................................8
5. THERMAL Indicator......................................................8
6. CONTOUR ...................................................................8
7. LOW CUT.....................................................................8
8. LEVEL...........................................................................9
9. SIGNAL PRESENT Indicator..........................................9
10. PEAK Indicator ..........................................................9
11. INPUT Connector.......................................................9
12. THRU Connector ........................................................9
CONNECTIONS......................................................................10
PLACEMENT...........................................................................10
Room Acoustics .............................................................10
RIGGING ..............................................................................11
THERMAL CONSIDERATIONS.................................................12
AC POWER CONSIDERATIONS ..............................................12
AC Power Distribution...................................................12
SERVICE INFORMATION ........................................................14
Troubleshooting.............................................................14
Repair............................................................................16
CARE AND MAINTENANCE....................................................16
SPECIFICATIONS....................................................................17
BLOCK DIAGRAM..................................................................18
LIMITED WARRANTY..............................................................19
Please write the serial number for your SRM450v2 here
(or for both SRM450v2s if you have two) for future reference
(i.e., insurance claims, tech support, return authorization, etc.):
Loudspeaker 1
Loudspeaker 2
Purchased at:___________________________________ Date of Purchase:_____________
Don’t forget to visit our website at www.mackie.com
for more information about this and other Mackie products.
Part No. SW0617 Rev. E 03/11
©2007-2011 LOUD Technologies Inc. All Rights Reserved.
3
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INTRODUCTION
•
Each amplifier has its own compressor circuit that acts
when the input signal is large enough to cause clipping,
distortion and excessive voice coil heat. The compressor
will automatically decrease the input signal to a safe
level. The compressor in the low-frequency amp works
independently from that in the high-frequency amp.
Thank you for choosing LOUD Technologies’ Mackie
active sound reinforcement loudspeakers.
The SRM450v2 is a redesigned version of our
popular SRM450 active loudspeaker. With its newly
designed Class-D Fast-Recovery amplifiers, high-output
compression driver, and 12" woofer, it produces an even
smoother sound than the original. SRM means Sound
Reinforcement Monitor, and the SRM450v2 truly produces a
studio quality sound in a sound reinforcement speaker.
Our design goal was to build a sound reinforcement
speaker with:
1. High precision, high output, and accurate playback.
2. Very wide, smooth dispersion of mid and high
frequencies.
3. Ergonomically correct physical design for easy transport
and set up.
Through the combined resources of our top-notch
mechanical and analog engineers, and our experienced
transducer engineers at EAW, we were able to achieve our
design goals in every aspect. The result is a sound
reinforcement system equally at home in a concert setting, in
the studio, impromptu concerts on the studio roof, in the
cinema, or in a home theater.
• The low-frequency amp uses a servo feedback loop
which senses the current flowing in the woofer coil. This
controls the low-frequency response and maintains low
distortion at high output levels.
• The low-frequency amplifier also has a sweeping filter.
This will automatically move the low cut-off frequency up
or down depending on the amplifier output. For example,
if the amplifier is below clipping, the low-frequency cut-
off point is 55 Hz. As it approaches clipping, this shifts up
smoothly to 120 Hz, providing more power reserves and
less distortion before clipping. This happens quickly
and continuously, protecting the amplifier and the
woofer and reducing any noticeable distortion.
Warning: Although the amplifiers have
these protection circuits, you must still
make sure the PEAK light is not blinking
continuously. If it is, turn down your
mixer faders, or preamplifier gain, or
turn down the SRM450v2 LEVEL
control.
The Transducers
The SRM450v2 active speakers feature a 12-inch high-
power low-frequency woofer with a 3-inch voice coil and
a 1.75-inch titanium diaphragm high-output compression
driver. This high-frequency driver is mounted on an
The Crossover
acoustically non-resonant exponential waveguide, providing
a wide, controlled dispersion and precise reproduction of
the critical upper mid-range and high frequencies. The
result is an unbelievably smooth off-axis response that
allows everyone in the audience to experience the same
high-resolution audio no matter where they are seated.
The built-in electronic crossover is a 24 dB/octave
Linkwitz-Riley design. Although more expensive than other
crossover designs, 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 Power Amplifiers
To power these beauties, each SRM450v2 includes two of
our acclaimed FR Series “Fast Recovery” power amplifiers. In
addition, the low-frequency amplifier uses a Class D design
for improved efficiency and cleaner power. Our exclusive
designs use low negative feedback, yet allow the amplifiers
to maintain low distortion and stability and to quickly
recover when driven into clipping.
The amplifiers include the following features:
• The low-frequency amplifier produces up to 540 watts
peak (300 continuous) before clipping.
• 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.
• Our heroic engineers have worked carefully to
ensure that the SRM450v2 also provides perfect phase
response. This diligence has yielded phenomenal
accuracy, even if you are standing 20 feet away.
• The high-frequency amplifier produces up to 150 watts
peak (100 continuous) before clipping.
4
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The Cabinet
The SRM450v2 cabinet was designed to be the strongest • The amplifiers are designed specifically for these
molded composite cabinet on the planet. This material is as
strong as concrete, and rigid enough to prevent unwanted
vibrations in the cabinet. It has built-in fly points for
hanging, and a socket in the bottom for mounting on a
tripod stand. Although it is an exceptional choice for
installed sound situations, its light weight and durable
finish also make it ideal for portable sound system use. The
asymmetrical trapezoidal design of the cabinet makes it
easy to use as a floor wedge for stage monitor applications.
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 compromised 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.
The Active Advantage
There are a number of advantages to using an active
speaker system over a passive loudspeaker:
• The acoustic sum of the outputs from the two drivers
is optimized electronically, as well as physically, so the
amplitude response is flat and there is no lobing error.
• 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 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.
In short, all the complex interconnected components
in the system are designed to work in harmony with each
other to produce the best possible sound. (Even for Uncle
Bert’s star performance on spoons!)
5
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HOOKUP DIAGRAMS
Quick Start
1. Start with the following settings on the back of the
SRM450v2:
4. Turn on your signal source. Make sure its Master
Volume control (if it has one) is turned all the
way down.
Turn the POWER switch off (down).
5. Turn on the SRM450v2 POWER switch.
Set the TIMED TURNOFF, CONTOUR, and LOW CUT
switches out.
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.
WARNING: Turn the LEVEL control
down (counterclockwise) before every
use. If not, 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.
7. Slowly turn up the LEVEL control on the back of the
SRM450v2 until the desired volume is reached (and the
PEAK 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 SRM450v2
LEVEL control before investigating. There may be a
mixer or preamplifier mute or tape switch engaged,
or a mic switch off.
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 SRM450v2. It accepts balanced line-level signals from
mixers, preamplifiers, CD players, tape decks, etc., and
accepts direct connections from dynamic microphones.
3. Connect the supplied AC power cord to the IEC socket
on the back of the SRM450v2. Plug the other end into
an AC outlet properly configured with the correct
voltage for your particular model.
THERMAL
PEAK
SIGNAL PRESENT
NORMAL
THERMAL
PEAK
SIGNAL PRESENT
NORMAL
(+4dBu)
(+4dBu)
POWER
POWER
ON
OFF
ON
OFF
LINE
MIC
LINE
MIC
100Hz
12k/AIR
75Hz
LOW CUT
100Hz
12k/AIR
75Hz
LOW CUT
TIMED TURNOFF
TIMED TURNOFF
O
O +40dB
O
O +40dB
ON
CONTOUR +3dB
ON
CONTOUR +3dB
LEVEL
LEVEL
O
O
THRU
THRU
PARALLEL
PARALLEL
From Mixer
From Mixer
Next
Left Output
Right Output
Next
1
2
3
4
CTRL
-
RM OUT
MAIN OUT
ALT 3-4 OUT
TAPE
IN
OUT
L
R
L
R
L/3
R/4
LINE IN 5-6
LINE IN 7-8
LINE IN 9-10 LINE IN 11-12
Thru
Thru
1
LINE
2
LINE
3
LINE
4
LINE
L
L
L
L
R
R
R
R
CTRL ROOM/PHONES
SOURCE
L
R
From Mixer
From Mixer
Mixing Console
(Mackie Onyx
1220i shown)
Left Output
Right Output
EQ
EQ
EQ
EQ
HIGH
EQ
HIGH
EQ
HIGH
EQ
HIGH
HIGH
HIGH
HIGH
HIGH
MID
MID
MID
MID
MID
MID
MID
MID
CONTROL PHONES
ROOM
LOW
LOW
LOW
LOW
LOW
LOW
LOW
LOW
AUX MASTER
AUX
AUX
AUX
AUX
AUX
AUX
AUX
AUX
1
1
1
1
1
1
1
1
1
2
1
2
2
2
2
2
2
2
2
2
PAN
PAN
PAN
PAN
PAN
PAN
PAN
PAN
MUTE
MUTE
MUTE
MUTE
MUTE
MUTE
MUTE
MUTE
Mixing Console
(Mackie Onyx 1220i shown)
SOLO
SOLO
SOLO
SOLO
SOLO
SOLO
SOLO
SOLO
11-12
1
2
3
4
5-6
7-8
9-10
TALKBACK
MAIN MIX
SRM450v2: STEREO OPERATION WITH A MIXER, AND USING THE THRU jACK
6
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For microphone connections, you can
daisy-chain up to two SRM450v2s using the THRU
jacks as shown.
Dynamic
Microphone
Take great care to point any microphones
away from the SRM450v2s, otherwise you may
get feedback.
THERMAL
PEAK
SIGNAL PRESENT
NORMAL
THERMAL
PEAK
SIGNAL PRESENT
NORMAL
(+4dBu)
(+4dBu)
POWER
POWER
ON
OFF
ON
OFF
LINE
MIC
LINE
MIC
100Hz
12k/AIR
75Hz
100Hz
12k/AIR
75Hz
TIMED TURNOFF
TIMED TURNOFF
O
O +40dB
O
O +40dB
ON
CONTOUR +3dB
LOW CUT
ON
CONTOUR +3dB
LOW CUT
LEVEL
LEVEL
O
O
THRU
PARALLEL
PARALLEL
THRU
Output
SRM450v2: USING A MICROPHONE AND THE THRU jACK
The SRM450v2 may be
paired with a Mackie SRM1801
subwoofer to create an
incredibly powerful system.
The active crossover inside
the SRM1801 splits the full-
range input signal into two
ranges. The SRM1801 plays the
low-frequency range and sends
the high-pass range to the
SRM450v2.
Pole
Pole
Mount
Power
Cord
Power
Cord
Mount
Line-level
High Pass
output
Line-level
High Pass
output
The SRM450v2 can be pole
mounted on top of the SRM1801
as shown using the optional
SPM200 Speaker Pole Mount,
saving the cost of a more
To SRM1801
input
To SRM1801
input
expensive tripod stand.
Power
Cords
Power
Cords
SRM1801
SRM1801
plays the low
frequencies
plays the low
frequencies
Mixing Console
(Mackie Onyx 1220i shown)
SRM450v2: 3-WAY SYSTEM WITH A POWERED SUBWOOFER
7
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5. THERMAL Indicator
REAR PANEL DESCRIPTION
This LED lights if the heatsink temperature exceeds a
safe operating temperature and triggers the thermal safety
switch. In the unlikely event that this occurs, the built-in
amplifiers shut down until the heatsink temperature cools
back down. Then the thermal switch resets itself, the
THERMAL indicator turns off, and normal operation
resumes.
The SRM450v2 has several connectors, controls, and
indicators that you should understand.
1. IEC Socket
This is where you connect the supplied AC linecord to
provide AC power to the SRM450v2’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 linecord,
replacements are readily available at any office or computer
If the SRM450v2 keeps shutting down,
make sure there is plenty of ventilation
to the rear panel. Please see “Thermal
Considerations” on page 12.
supply store. Always use a three-pin plug with a ground pin.
2. POWER Switch
Switch up to turn the SRM350v2 on. Make sure the
LEVEL control is down before you turn it on. Press the
bottom of this switch to put the speaker into standby mode.
It will not function, but the circuits are still live. To remove
AC power, either turn off the AC mains supply, or unplug
the power cord from the speaker and the AC mains supply.
6. 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 determine which way sounds best for your application.
It is especially useful when listening at lower volumes, as
it highlights the bass like a Loudness switch, in addition to
boosting the highs.
3. POWER ON 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.
7. LOW CUT
Pushing in this switch engages a low-cut filter, which
rolls off the low frequencies below 75 Hz. This is useful for
minimizing stage noise (rumble) and microphone handling
noise.
It is highly recommended that you engage this switch
when using the SRM450v2 as a stage monitor. This allows
the bass amplifier to utilize its power for those frequencies
useful in stage monitor applications.
4. TIMED TURNOFF
When this switch is pushed in, the built-in amplifiers turn
on and off depending on the presence or absence of an input
signal. An input signal level of –45 dBu (minimum) activates
the auto-on function. A silent period greater than three
minutes activates the auto-off function. The blue LED on the
front of the speaker reflects the state of the amplifiers.
THERMAL
PEAK
SIGNAL PRESENT
NORMAL
(+4dBu)
POWER
ON
OFF
LINE
MIC
100Hz
12k/AIR
75Hz
TIMED TURNOFF
ON
O O
+40dB
LEVEL
CONTOUR +3dB
LOW CUT
O
THRU
INPUT
PARALLEL
8
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8. LEVEL
10. PEAK Indicator
This is used to adjust the signal level going into the
built-in power amplifiers, from off, up to 40 dB of gain.
Since the SRM450v2 incorporates Mackie’s world-class
When the signal levels at the amplifier outputs approach
clipping, a soft compression circuit is activated that reduces
the input signal. The PEAK LED lights whenever the
low-noise mic preamp technology, you can connect either a compression circuit is active. At this time, the SRM450v2
line-level or a microphone-level signal to the input, and
use this control to adjust the level correctly.
may reach sound pressure levels of 120 dB or more.
It’s okay for the PEAK 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 SRM450v2’s LEVEL control.
There is no phantom power for a
microphone, so you should use a
dynamic mic, or use a condenser type
if it has its own battery power.
Wear hearing protection if you are
close to the SRM450v2 playing at
high levels.
Follow the Quick Start guide on page 6 for setting the
LEVEL control. For most applications, it will be in the
NORMAL position (12 o’clock). If you have a particularly
high line-level signal connected to the SRM450v2, you
may need to turn the control down to the LINE indication
(9 o’clock). If you have a low line-level or mic-level signal
connected, you may need to turn the LEVEL control up to
the MIC indication (3 o’clock).
11. INPUT Connector
This is a female XLR-type connector that accepts a
balanced or unbalanced mic- or line-level signal.
9. SIGNAL PRESENT Indicator
12. THRU Connector
This LED illuminates whenever there is a signal present
at the INPUT connector on the rear panel. It senses the
signal just prior to the LEVEL control, so even if the LEVEL
control is turned down, the SIGNAL PRESENT indicator
still works, letting you know there is a signal present at the
input before turning up the LEVEL control.
This is a male XLR-type connector that produces exactly
the same signal that is connected to the INPUT jack. It can
be a balanced or unbalanced mic- or line-level signal. Use it
to daisy-chain several active speakers together off the same
signal source.
9
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CONNECTIONS
PLACEMENT
The SRM450v2 has a female XLR 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 Engineering Society) standards:
The SRM450v2 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, shown
opposite.
XLR
You can lay the cabinet down on its side and use the
SRM450v2 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. When used
for monitor applications, we recommend engaging the
LOW CUT filter.
Hot (+)
Cold (–)
Shield (Ground)
Pin 2
Pin 3
Pin 1
There is also a male XLR connector labeled THRU. This
allows you to connect more than one SRM450v2 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 6).
As with any powered components,
protect them from moisture. If you are
setting them up outdoors, make sure
they are under cover if you expect rain.
There is a limit to how many you can
daisy-chain together. A general rule is
to maintain a load impedance ten times
or more than the source impedance to
The SRM450v2 generates magnetic
fields. Do not place it closer than two
feet (0.6 meters) from any TV set or
computer monitor. Check the screen for
any change in color or distortion. Do not
place any magnetic audio or video tapes
or computer discs near the SRM450s.
prevent excessive loading on the source.
For example, if your mixer has an output
impedance of 120 ohms, then you can daisy chain up to
sixteenSRM450v2s.Thisisaloadof1250ohms (SRM450v2
input impedance=20 kohms; 16 of these in parallel=1250
ohms).
Room Acoustics
The SRM450v2 active speakers are designed to sound as
neutral as possible; that is, to reproduce the input signal as
accurately as possible, monitoring the sound rather than
changing it.
Since microphones typically have a higher output
impedance, you should limit daisy-chaining from a mic
source to two SRM450v2s (see the diagram on page 7).
The THRU jack is wired straight from the INPUT
connector — there is no electronic circuitry between — so
the signal coming out of the THRU jack is exactly the same
as the signal going in.
Room acoustics play a crucial role in the overall
performance of a sound system. However, the wide high-
frequency dispersion of the SRM450v2 helps to minimize
the problems that typically arise.
Balanced XLR Connectors
Top
0
90
0
90 Dispersion
up to 20 kHz
10
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Here are some other placement tips:
RIGGING
The SRM450v2 cabinets are fitted with ten rigging points
as shown in the diagram below. These are M10 inserts. M10
threaded eyebolts (M10 x 1.5 mm x 20 mm) are available to
fit these inserts (PA-A1 Eyebolts).
• Avoid placing loudspeakers in the corners of a room.
This increases the low-frequency output and can cause
the sound to be muddy and indistinct.
• 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 attempt to suspend
the SRM450v2 active speakers by their
handles. If you want to suspend them,
use the rigging points only. Consult a
professional rigger or structural
• 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.
engineer prior to suspending loudspeakers from a structure
not intended for that use. Always know the working load
limit of the structure supporting the loudspeaker array.
Always make sure that the rigging hardware minimum
rating is at least five times the actual load.
• Position the active speakers so the high-frequency
drivers are two to four 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
lower frequencies. By providing direct line-of-sight
from the active speakers to the audience, you increase
the overall brightness and intelligibility of the sound
system.
Back
Both Sides
• 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 minimize the reflections, such as putting
Pole
Mount
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.
Rigging Points
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
reflections 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.
Top
Bottom
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).
If you are hanging them in an
inaccessible place, such as over a lion’s
cage, make sure that you first complete
the sound check and set the SRM450v2
LEVEL correctly. Also set the TIMED
TURNOFF switch if you want the SRM450v2 to turn on
when there is a signal present. It will also turn off after
three or more minutes of silence.
11
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THERMAL CONSIDERATIONS AC POWER CONSIDERATIONS
The amplifiers inside the SRM450v2s are
convection cooled by a large heatsink.
For efficient cooling, it is important to
allow at least six inches of free space
behind the SRM450v2.
Be sure the SRM450v2 is plugged into an outlet that is
able to supply the correct voltage specified for your model.
If the voltage should drop below 97% of the specified line
voltage, the built-in amplifiers will no longer be able to
supply rated power. (They will continue to operate down
to 75% of the rated line voltage, but won’t reach full power,
resulting in lower headroom).
If you use the SRM450v2 on its side for
stage monitor applications, we highly
recommended that you engage the rear
panel LOW CUT switch. This will allow
more power for useful monitor
Under maximum SPL conditions, where musical peaks
are clipping, the SRM450v2 120V model draws 2.5 amps on
average (1.3 amps for the 240V model). Under normal
conditions, the current draw is below 1 amp.
frequencies, while reducing the
possibility of overheating.
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 cleaner, punchier bass. A
suspected problem of “poor bass performance” is often
caused by a weak AC supply to the amplifiers.
If the ambient temperature in the room is high, though
highly unlikely, it could cause the amplifiers to overheat.
In this case, you should try aiming a fan at the heatsink to
increase the air flow through the fins.
AC Power Distribution
A 240 VAC center-tapped service entrance 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.
During a performance, don’t have it cranked so high that
the rear panel PEAK LED is blinking frequently or lighting
continuously. You should turn down the LEVEL control a
notch or two to avoid overheating the amplifiers or your
neighbors.
If lighting is used in a show, it is preferable 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 audio (particularly
if SCRs, or light-dimmer switches, are used).
If the amplifiers do overheat, a built-in thermal
switch will activate, placing the amplifiers into standby.
When the amplifiers have cooled down to a safe
operating temperature, the thermal switch will reset
and the SRM450v2 will resume normal operation.
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 CUT
HEATSINK
Low power components such as tape decks, mixers,
effects processors and CD players should be connected to
the same outlet as the SRM450v2s. Use fused power strips
as shown in the diagram on the next page. Make sure that
the total current draw of your components does not exceed
the capability of the outlets and power strips.
HIGH VOLTAGE POWER LINE
THERMAL
PEAK
THERMAL
PEAK
SIGNAL PRESENT
NORMAL
(+4dBu)
POWER
ON
OFF
LINE
MIC
100Hz
12k/AIR
75Hz
TIMED TURNOFF
O
O +40dB
120V
ON
CONTOUR +3dB
LOW CUT
LEVEL
PRIMARY
WINDING
SECONDARY
WINDING
240V
120V
THRU
INPUT
PARALLEL
EARTH
GROUND
(NEUTRAL)
TRANSFORMER
12
240V CENTER-TAPPED SECONDARY
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For the US 120 V model:
A maximum of five SRM450v2s can be connected per
15A service.
Don’t use an outlet if it is wired
improperly! This is to protect yourself
as well as your equipment.
This allows each SRM450v2 to be safely operated at its
maximum level.
When turning your system on, turn on the SRM450v2s
last. This will stop any turn-on thumps and bangs from your
source equipment being amplified.
Never remove the ground pin on the
power cord of the SRM450v2 or any
other component. This is very dangerous.
When turning off your system, turn off the SRM450v2s
first. This will prevent any turn-off thumps and bangs from
your source equipment being amplified.
When setting up for a show, often you
are plugging 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 so you can check the
outlets yourself to 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.
COMPRESSOR
EFFECTS
CD
SRM450v2: AC CONNECTIONS
13
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SERVICE INFORMATION
If you think your Mackie product has a problem,
please check out the following troubleshooting tips and
do your best to confirm the problem. Visit the Support
section of our website (www.mackie.com/support)
where you will find lots of useful information such as
FAQs and other documentation. You may find the answer
to the problem without having to send your Mackie
product away.
One side is way louder than the other!
• Are the LEVEL controls set the same on both active
speakers?
• 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
other side is louder now, the problem is with the mixer
or the signal source.
Troubleshooting
No power!
• 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
Poor bass performance
not, try turning it on.
• 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 SRM450v2 to be out-of-
phase.
• 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.
• 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.
As soon as the music gets loud, the SRM450v2
shuts down!
No sound!
• Be sure that the PEAK LED on the rear panel is not
lighting up frequently or continuously.
• 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
PRESENT LED blink on the rear panel.
Remember to wear ear protectors if
you get close to an SRM450v2 playing
at high levels. When the PEAK LED
comes on, the SPL is in a region above
120 dB!!!
• Make sure there is room behind the rear panel to
provide sufficient ventilation to the heatsink.
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 completely 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.
• 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.
• Is the THERMAL LED lit? Make sure there is at least
six inches of free space behind the heatsinks. Allow the
SRM450v2 to cool off and it will turn back on.
14
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Noise
• Disconnect any cables which come in 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 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 adapters):
• Make sure all connections to the active speakers
are good.
• Make sure none of the signal cables are routed near
AC cables, power transformers, or other EMI-inducing
devices.
• Is there a light dimmer or other SCR-based device on
the same AC circuit as the SRM450v2? Use an AC line
filter or plug the SRM450v2 into a different AC circuit.
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 SRM450v2. 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.
• Use balanced connections throughout your system for
• If the hum persists, try removing components 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 SRM450v2s and the hum is still there, try
different connection cables, or move the preamp/mixer
to another location.
• Pressing the LOW CUT FILTER may help reduce the
hum if you have trouble finding the cause of the
problem. Do this anyway if you do not need to
reproduce the lower frequency range.
the best noise rejection.
• Whenever possible, plug all the audio equipment’s
linecords into outlets which share a common ground
(see the diagram 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 SRM450v2 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).
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
15
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Repair
Dimensions
For warranty service, refer to the warranty
15.4 in/390 mm
14.8 in/376 mm
information on page 19.
Non-warranty service for Mackie products is
available at a factory-authorized service center. To
com, click “Support” and select “Locate a Service
Center.” Service for Mackie products living outside
the United States can be obtained through local
dealers or distributors.
If you do not have access to our website, you can call
our Tech Support department at 1-800-898-3211,
Monday-Friday, 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.
CARE AND MAINTENANCE
15.4 in/390 mm
Your Mackie active speakers will provide many years of
reliable service if you follow these guidelines:
Avoid exposing the loudspeakers to
moisture. If they are set up outdoors, be
sure they are under cover if you expect
rain or you live in Washington.
• Avoid exposure to extreme cold (below freezing
temperatures). If you must operate the loudspeakers
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 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.
Need help with your SRM450v2?
•
FAQs, manuals, addendums, and other useful information.
•
•
Email us at: [email protected].
Telephone 1-800-898-3211 to speak with one of our splendid
technical support representatives, (Monday through Friday,
normal business hours, PST).
16
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SRM450v2 SPECIFICATIONS
System Specifications
Line Input Power
Frequency Response (–3 dB)
55 Hz – 18 kHz
Frequency Range (–10 dB)
45 Hz – 20 kHz
Directivity Factor; Q (DI)9.95 (9.98), averaged 2 kHz to 10 kHz
Max SPL Long-term @ 1m
124 dB
US
120 VAC, 60Hz
Recommended amperage service 2.5 amps
Europe 230 VAC, 50Hz
Recommended amperage service 1.25 amps
Japan 100 VAC, 50/60Hz
Recommended amperage service 3.0 amps
AC Connector 3-pin IEC 250 VAC
Max SPL Peak @ 1m 127 dB
Control System Function
Crossover
Linkwitz-Riley,
24 dB/octave @ 1600 Hz
Electronic Crossover
Phase Alignment
Equalization
Audio
Input Type
Input Impedance
Input Protection
Sensitivity
Line:
Balanced Differential
20 kohms
RFI and level protected
Parametric Equalization
Safety Features
Over-Excursion Protection
Second-Order High-Pass Filter
Thermal Protection
+4 dBu (center detent)
–36 dBu
Mic:
Amplifier shutdown, auto-reset
Maximum Input Level +22 dBu
Low-Cut Frequency
Acoustic Contour Equalization
Low-Line Voltage Shut Down
75 Hz, Second-order filter
60% Nominal line
Independent LF and HF compressors
Dynamic, signal-level dependent
Driver Protection
Low-Freq Roll-Off
Peaking:
+3 dB @ 100 Hz,
+3 dB @ 12 kHz
Operating Temperature Range
Construction Features
–10ºC to 45ºC (14ºF to 113ºF)
Basic Design Asymmetrical Trapezoidal
Enclosure Alignment Sixth-Order
Power Amplifiers
Low-Frequency Power Amplifier
Material
Finish
Handles
Polypropylene
Black textured finish
One on each side, one on top
Rated Power
Rated THD
Cooling
300 watts*
< 0.1%
Convection Extrusion
Mounting Methods
Integrated mounting points, M10
Design Class D, Parametric Servo Feedback
Two each located on each side, top, bottom, and
rear of enclosure
High-Frequency Power Amplifier
Grille
Perforated metal with weather-resistant coating
Rated Power
Rated THD
Cooling
100 watts*
< 0.1%
Convection Extrusion
Conventional Class AB
Display LEDs Signal Present, Peak, Power ON, and Thermal
Physical Properties
Design
Height
Width
Depth
Weight
26.0 in / 660 mm
15.4 in / 390 mm
14.8 in / 376 mm
40 lb / 18 kg
*Rated power is continuous rms wattage into transducer’s rated impedance @ 5 kHz
for the HF amplifier and @ 500 Hz for the LF amplifier.
Transducers
Low-Frequency Transducer
Options
Diameter
Voice Coil Diameter
12 in / 300 mm
3.0 in / 75 mm
PA-A1 forged shoulder eyebolt hardware (M10 x 1.5 mm x 20 mm)
Sensitivity (1W@1m) 98 dB
Nominal Impedance 8 ohms
SPM200 (Speaker Pole Mount)
Power Handling
Frequency Range
600 watts, program
45 Hz – 3 kHz
Disclaimer
Since we are always striving to make our products better by incor-
porating 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 1.75 in/44.5 mm
Diaphragm Material Heat treated titanium
Sensitivity (1W@1m) 106 dB
Nominal Impedance 8 ohms
Power Handling
Frequency Range
“Mackie.,” the “Running Man” figure, and “FR Series” are registered
trademarks of LOUD Technologies Inc.
100 watts, program
1 kHz – 20 kHz
All other brand names mentioned are trademarks or registered
trademarks of their respective holders, and are hereby acknowledged.
Horn Design
©2003-2011 LOUD Technologies Inc.
All Rights Reserved.
Type
Mouth Size
Throat Diameter
Conical and Exponential
12 in/304.8 mm (W) x 7 in/177.8 mm (H)
1 in/25.4 mm
Horizontal Coverage 90º (1 kHz–20 kHz)
Vertical Coverage 45º (2.8 kHz–20 kHz)
17
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SRM450v2 BLOCK DIAGRAM
18
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Mackie 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.mackie.com/warranty 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.mackie.com/support 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.mackie.com/warranty.
The Product Warranty, together with your invoice or receipt, and the terms and conditions located
at www.mackie.com/warranty 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.
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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