Mackie SRM450v2 User manual

SRM450 v2 Active
Sound ReinfoRceMent
SPeAKeR uSeR’S MAnuAl

2
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with dry cloth.
7. Do not block any ventilation openings. Install in accordance with the
manufacturer’s instructions.
8. Do not install near any heat sources such as radiators, heat registers,
stoves, or other apparatus (including amplifiers) that produce heat.
9. Do not defeat the safety purpose of the polarized or grounding-type
plug. A polarized plug has two blades with one wider than the other.
A grounding-type plug has two blades and a third grounding prong.
The wide blade or the third prong are provided for your safety. If the
provided plug does not fit into your outlet, consult an electrician for
replacement of the obsolete outlet.
10. Protect the power cord from being walked on or pinched particularly
at plugs, convenience receptacles, and the point where they exit
from the apparatus.
11. Only use attachments/accessories specified by the manufacturer.
12. Use only with a cart, stand, tripod, bracket, or table specified by the
manufacturer, or sold with the apparatus. When a cart is used, use
caution when moving the cart/apparatus combination to avoid injury
from tip-over.
13. Unplug this apparatus during lightning storms or when unused for
long periods of time.
14. Refer all servicing to qualified service personnel. Servicing is required
when the apparatus has been damaged in any way, such as power-
supply cord or plug is damaged, liquid has been spilled or objects
have fallen into the apparatus, the apparatus has been exposed to
rain or moisture, does not operate normally, or has been dropped.
15. This apparatus shall not be exposed to dripping or splashing, and
no object filled with liquids, such as vases, shall be placed on the
apparatus.
16. This apparatus has been designed with Class-I construction and must
be connected to a mains socket outlet with a protective earthing
connection (the third grounding prong).
17. This apparatus has been equipped with an all-pole, rocker-style AC
mains power switch. This switch is located on the rear panel and
should remain readily accessible to the user.
18. This apparatus does not exceed the Class A/Class B (whichever is ap-
plicable) limits for radio noise emissions from digital apparatus as set
out in the radio interference regulations of the Canadian Department
of Communications.
ATTENTION — Le présent appareil numérique n’émet pas de bruits
radioélectriques dépassant las limites applicables aux appareils numériques
de class A/de class B (selon le cas) prescrites dans le réglement sur le
brouillage radioélectrique édicté par les ministere des communications du
Canada.
19. Exposure to extremely high noise levels may cause permanent
hearing loss. Individuals vary considerably in susceptibility to noise-
induced hearing loss, but nearly everyone will 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 specified the permissible noise level exposures shown in the
following chart.
According to OSHA, any exposure in excess of these permissible
limits could result in some hearing loss. To ensure against potentially
dangerous exposure to high sound pressure levels, it is recommended
that all persons exposed to equipment capable of producing high
sound pressure levels use hearing protectors while the equipment
is in operation. Ear plugs or protectors in the ear canals or over the
ears must be worn when operating the equipment in order to prevent
permanent hearing loss if exposure is in excess of the limits set forth
here.
IMPORTANT SAFETY INSTRUCTIONS
WARNING — To reduce the risk of fire
or electric shock, do not expose this
apparatus to rain or moisture.
PORTABLE CART WARNING
Carts and stands - The
Component should be used
only with a cart or stand
that is recommended by
the manufacturer.
A Component and cart
combination should be
moved with care. Quick
stops, excessive force, and
uneven surfaces may cause
the Component and cart
combination to overturn.
CAUTION AVIS
RISK OF ELECTRIC SHOCK
DO NOT OPEN
RISQUE DE CHOC ELECTRIQUE
NE PAS OUVRIR
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK
DO NOT REMOVE COVER (OR BACK)
NO USER-SERVICEABLE PARTS INSIDE
REFER SERVICING TO QUALIFIED PERSONNEL
ATTENTION: POUR EVITER LES RISQUES DE CHOC
ELECTRIQUE, NE PAS ENLEVER LE COUVERCLE. AUCUN
ENTRETIEN DE PIECES INTERIEURES PAR L'USAGER. CONFIER
L'ENTRETIEN AU PERSONNEL QUALIFIE.
AVIS: POUR EVITER LES RISQUES D'INCENDIE OU
D'ELECTROCUTION, N'EXPOSEZ PAS CET ARTICLE
A LA PLUIE OU A L'HUMIDITE
The lightning flash with arrowhead symbol within an equilateral
triangle is intended to alert the user to the presence of uninsulated
"dangerous voltage" within the product's enclosure that may be
of sufficient magnitude to constitute a risk of electric shock to persons.
Le symbole éclair avec point de flèche à l'intérieur d'un triangle
équilatéral est utilisé pour alerter l'utilisateur de la présence à
l'intérieur du coffret de "voltage dangereux" non isolé d'ampleur
suffisante pour constituer un risque d'éléctrocution.
The exclamation point within an equilateral triangle is intended to
alert the user of the presence of important operating and maintenance
(servicing) instructions in the literature accompanying the appliance.
Le point d'exclamation à l'intérieur d'un triangle équilatéral est
employé pour alerter les utilisateurs de la présence d'instructions
importantes pour le fonctionnement et l'entretien (service) dans le
livret d'instruction accompagnant l'appareil.
Duration Per Day Sound Level dBA, Typical
In Hours Slow Response Example
 8  90 Duoinsmallclub
 6  92 
 4  95 SubwayTrain
 3  97
 2  100 Veryloudclassicalmusic
 1.5 102
 1  105 TamiscreamingatAdrianaboutdeadlines
 0.5 110
 0.25orless 115 Loudestpartsatarockconcert

3
Don’t forget to visit our website at www.mackie.com
for more information about this and other Mackie products.
R
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
SRM450 SPECIFICATIONS......................................................17
SRM450 v2 BLOCK DIAGRAM...............................................18
SRM450 v2 LIMITED WARRANTY ..........................................19
Loudspeaker 1 Loudspeaker 2
• Please write the serial number for your SRM450 v2 here
(or for both SRM450 v2s if you have two) for future reference
(i.e., insurance claims, tech support, return authorization, etc.):
Purchased at:___________________________________ Date of Purchase:_____________
Part No. 0026934 Rev. B 01/08
©2007-2008 LOUD Technologies Inc. All Rights Reserved. Printed in China.

4
INTRODUCTION
Thank you for choosing LOUD Technologies’ Mackie
active sound reinforcement loudspeakers.
The SRM450 v2 is a redesigned version of our popu-
lar SRM450 active loudspeaker. With its newly designed
Class-D Fast-Recovery amplifiers, high-output compression
driver, and new 12" neodymium woofer, it produces an
even smoother sound than the original. SRM means Sound
Reinforcement Monitor, and the SRM450 v2 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 frequen-
cies.
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 rein-
forcement 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 Transducers
The SRM450 v2 active speakers feature a 12-inch high-
power low-frequency woofer with a 3-inch voice coil and
neodymium magnet, and a 1.75-inch titanium diaphragm
high-output ceramic compression driver. This high-frequency
driver is mounted on an acoustically non-resonant expo-
nential 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.
FR Series Power Amplifiers
To power these beauties, each SRM450 v2 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 re-
cover 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 high-frequency amplifier produces up to 150 watts
peak (100 continuous) before clipping.
•
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.
• 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 amplifer and the
woofer and reducing any noticable 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 mix-
er faders, or preamplifier gain, or turn
down the SRM450 v2 LEVEL control.
The Crossover
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 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 en-
sure that the SRM450 v2 also provides perfect phase
response. This diligence has yielded phenomenal ac-
curacy, even if you are standing 20 feet away.

5
The Cabinet
The SRM450 v2 cabinet was designed to be the strongest
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 hang-
ing, 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 asym-
metrical trapezoidal design of the cabinet makes it easy to
use as a floor wedge for stage monitor applications.
The Active Advantage
There are a number of advantages to using an active
speaker system over a passive loudspeaker:
• The internal crossover is active, and its low power cir-
cuitry 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 compromised by the resis-
tance of long speaker cables. In addition, all the power
from the amplifier is transferred directly to the drivers
with no speaker cable losses.
• 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 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!)

6
HOOKUP DIAGRAMS
Quick Start
1. Start with the following settings on the back of the
SRM450 v2:
Turn the POWER switch off (down).
Set the TIMED TURNOFF, CONTOUR, and LOW CUT
switches out.
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.
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 SRM450 v2. 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 SRM450 v2. Plug the other end into
an AC outlet properly configured with the correct volt-
age for your particular model.
4. Turn on your signal source. Make sure its Master Vol-
ume control (if it has one) is turned all the way down.
5. Turn on the SRM450 v2 POWER switch.
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
SRM450 v2 until the desired volume is reached (and
the PEAK light does not come on) Always wear hear-
ing protectors if you are close when it is playing at high
levels.
8. If there is no sound, always turn down the SRM450 v2
LEVEL control before investigating. There may be a
mixer or preamplifier mute or tape switch engaged, or a
mic switch off.
SRM450 v2: STEREO OPERATION WITH A MIXER, AND USING THE THRU jACK
DESIGNED BY MACKOIDSIN WOODINVILLE, WA,/ WHITINSVILLES,MA,USA/
SHENZHEN, CHINA • MANUFACTURED INCHINA • FABRIQUE EN CHINE
COPYRIGHT ©2007 "MACKIE", AND THERUNNING MAN FIGURE
ARE TRADEMARKS OF LOUDTECHNOLOGIES, INC. • PATENT PENDING.
100 - 120V
50 - 60 Hz 300W
POWER
SIGNAL PRESENT
INPUTTHRU
THERMAL PEAK
TIMED TURNOFF
ON
OFF
CONTOUR LOW CUTON
75Hz12k/AIR100Hz
+3dB
MIC
LINE
LEVEL
(+4dBu)
NORMAL
+40dB
OO
O
PARALLEL
DESIGNEDBYMACKOIDSIN WOODINVILLE,WA,/WHITINSVILLES,MA,USA/
SHENZHEN,CHINA•MANUFACTUREDIN CHINA• FABRIQUE EN CHINE
COPYRIGHT©2007"MACKIE",ANDTHE RUNNINGMAN FIGURE
ARETRADEMARKSOFLOUD TECHNOLOGIES,INC.• PATENT PENDING.
100-120V
50-60 Hz 300W
POWER
SIGNALPRESENT
INPUTTHRU
THERMAL PEAK
TIMEDTURNOFF
ON
OFF
CONTOUR LOWCUTON
75Hz12k/AIR100Hz
+3dB
MIC
LINE
LEVEL
(+4dBu)
NORMAL
+40dB
OO
O
PARALLEL
DESIGNEDBYMACKOIDSIN WOODINVILLE,WA,/WHITINSVILLES,MA,USA/
SHENZHEN,CHINA•MANUFACTUREDIN CHINA• FABRIQUE EN CHINE
COPYRIGHT©2007"MACKIE",ANDTHE RUNNINGMAN FIGURE
ARETRADEMARKSOFLOUD TECHNOLOGIES,INC.• PATENT PENDING.
100-120V
50-60 Hz 300W
POWER
SIGNALPRESENT
INPUTTHRU
THERMAL PEAK
TIMEDTURNOFF
ON
OFF
CONTOUR LOWCUTON
75Hz12k/AIR100Hz
+3dB
MIC
LINE
LEVEL
(+4dBu)
NORMAL
+40dB
OO
O
PARALLEL
DESIGNEDBYMACKOIDSIN WOODINVILLE,WA,/WHITINSVILLES,MA,USA/
SHENZHEN,CHINA•MANUFACTUREDIN CHINA• FABRIQUE EN CHINE
COPYRIGHT©2007"MACKIE",ANDTHE RUNNINGMAN FIGURE
ARETRADEMARKSOFLOUD TECHNOLOGIES,INC.• PATENT PENDING.
100-120V
50-60 Hz 300W
POWER
SIGNALPRESENT
INPUTTHRU
THERMAL PEAK
TIMEDTURNOFF
ON
OFF
CONTOUR LOWCUTON
75Hz12k/AIR100Hz
+3dB
MIC
LINE
LEVEL
(+4dBu)
NORMAL
+40dB
OO
O
PARALLEL
DESIGNEDBYMACKOIDSIN WOODINVILLE,WA,/WHITINSVILLES,MA,USA/
SHENZHEN,CHINA•MANUFACTUREDIN CHINA• FABRIQUE EN CHINE
COPYRIGHT©2007"MACKIE",ANDTHE RUNNINGMAN FIGURE
ARETRADEMARKSOFLOUD TECHNOLOGIES,INC.• PATENT PENDING.
100-120V
50-60 Hz 300W
POWER
SIGNALPRESENT
INPUTTHRU
THERMAL PEAK
TIMEDTURNOFF
ON
OFF
CONTOUR LOWCUTON
75Hz12k/AIR100Hz
+3dB
MIC
LINE
LEVEL
(+4dBu)
NORMAL
+40dB
OO
O
PARALLEL
DESIGNEDBYMACKOIDSIN WOODINVILLE,WA,/WHITINSVILLES,MA,USA/
SHENZHEN,CHINA•MANUFACTUREDIN CHINA• FABRIQUE EN CHINE
COPYRIGHT©2007"MACKIE",ANDTHE RUNNINGMAN FIGURE
ARETRADEMARKSOFLOUD TECHNOLOGIES,INC.• PATENT PENDING.
100-120V
50-60 Hz 300W
POWER
SIGNALPRESENT
INPUTTHRU
THERMAL PEAK
TIMEDTURNOFF
ON
OFF
CONTOUR LOWCUTON
75Hz12k/AIR100Hz
+3dB
MIC
LINE
LEVEL
(+4dBu)
NORMAL
+40dB
OO
O
PARALLEL
DESIGNEDBYMACKOIDSIN WOODINVILLE,WA,/WHITINSVILLES,MA,USA/
SHENZHEN,CHINA•MANUFACTUREDIN CHINA• FABRIQUE EN CHINE
COPYRIGHT©2007"MACKIE",ANDTHE RUNNINGMAN FIGURE
ARETRADEMARKSOFLOUD TECHNOLOGIES,INC.• PATENT PENDING.
100-120V
50-60 Hz 300W
POWER
SIGNALPRESENT
INPUTTHRU
THERMAL PEAK
TIMEDTURNOFF
ON
OFF
CONTOUR LOWCUTON
75Hz12k/AIR100Hz
+3dB
MIC
LINE
LEVEL
(+4dBu)
NORMAL
+40dB
OO
O
PARALLEL
DESIGNED BY MACKOIDSIN WOODINVILLE, WA,/ WHITINSVILLES,MA,USA/
SHENZHEN, CHINA • MANUFACTURED INCHINA • FABRIQUE EN CHINE
COPYRIGHT ©2007 "MACKIE", AND THERUNNING MAN FIGURE
ARE TRADEMARKS OF LOUDTECHNOLOGIES, INC. • PATENT PENDING.
100 - 120V
50 - 60 Hz 300W
POWER
SIGNAL PRESENT
INPUTTHRU
THERMAL PEAK
TIMED TURNOFF
ON
OFF
CONTOUR LOW CUTON
75Hz12k/AIR100Hz
+3dB
MIC
LINE
LEVEL
(+4dBu)
NORMAL
+40dB
OO
O
PARALLEL
Mixer or
Preamplifier
Right
Line level
Output
Left
Line level
Output
Thru
Daisy-chaining SRM450 v2s
Thru
Next
Next
PREMIUM ANALOGMIXER
w/PERKINS EQ & FIREWIRE OPTION
1 2 3 4 5
6
7
8
9
10
11
12
PREMIUMANALOG MIXER
w/PERKINSEQ &FIREWIRE OPTION
1 2 3 4 5
6
7
8
9
10
11
12

7
SRM450 v2: USING A MICROPHONE AND THE THRU jACK
SRM450 v2: 3-WAY SYSTEM WITH A POWERED SUBWOOFER
DESIGNED BY MACKOIDS IN WOODINVILLE, WA,/WHITINSVILLES, MA,USA/
SHENZHEN, CHINA • MANUFACTURED IN CHINA • FABRIQUE EN CHINE
COPYRIGHT ©2007 "MACKIE", AND THE RUNNING MAN FIGURE
ARE TRADEMARKS OF LOUD TECHNOLOGIES, INC. • PATENT PENDING.
100 - 120V
50 - 60 Hz 300W
POWER
SIGNAL PRESENT
INPUTTHRU
THERMAL PEAK
TIMED TURNOFF
ON
OFF
CONTOUR LOW CUTON
75Hz12k/AIR100Hz
+3dB
MIC
LINE
LEVEL
(+4dBu)
NORMAL
+40dB
OO
O
PARALLEL
DESIGNED BY MACKOIDS IN WOODINVILLE, WA,/WHITINSVILLES, MA,USA/
SHENZHEN, CHINA • MANUFACTURED IN CHINA • FABRIQUE EN CHINE
COPYRIGHT ©2007 "MACKIE", AND THE RUNNING MAN FIGURE
ARE TRADEMARKS OF LOUD TECHNOLOGIES, INC. • PATENT PENDING.
100 - 120V
50 - 60 Hz 300W
POWER
SIGNAL PRESENT
INPUTTHRU
THERMAL PEAK
TIMED TURNOFF
ON
OFF
CONTOUR LOW CUTON
75Hz12k/AIR100Hz
+3dB
MIC
LINE
LEVEL
(+4dBu)
NORMAL
+40dB
OO
O
PARALLEL
THRU
Output
Dynamic
Microphone
For microphone connections, you can daisy-
chain up to two SRM450 v2s using the THRU
jacks as shown.
Take great care to point any microphones
away from the SRM450 v2s, otherwise you may
get feedback.
Power
Cord
Power
Cord
Pole
Mount
Pole
Mount
Line-level
Hi-pass
out
Line-level
Hi-pass
out
Full
Range
Full
Range
Power
Cords Power
Cords
SWA1501
plays the low
frequencies
SWA1501
plays the low
frequencies
ACTIVEACTIVE
PREMIUMANALOGMIXER
w/PERKINSEQ&FIREWIRE OPTION
12345
6
7
8
9
10
11
12
The SRM450 v2 can be used
with a Mackie SWA1501 (or
SWA1801z or SWA2801z) sub-
woofer to create an incredibly
powerful system.
The active crossover inside
the SWA1501 splits the full-
range input signal into two
ranges. The SWA1501 plays the
low-frequency range through its
500 watt amplifier and 15-inch
woofer, and sends the high-pass
range to the SRM450 v2.
The SRM450 v2 can be pole
mounted on top of the SWA1501
as shown using the optional
SPM100 Speaker Pole Mount,
saving the cost of a more expen-
sive tripod stand.

8
DESIGNED BY MACKOIDS IN WOODINVILLE, WA,/ WHITINSVILLES, MA,USA/
SHENZHEN, CHINA • MANUFACTURED IN CHINA • FABRIQUE EN CHINE
COPYRIGHT ©2007 "MACKIE", AND THE RUNNING MAN FIGURE
ARE TRADEMARKS OF LOUD TECHNOLOGIES, INC. • PATENT PENDING.
100 - 120V
50 - 60 Hz 300W
POWER
SIGNAL PRESENT
INPUTTHRU
THERMAL PEAK
TIMED TURNOFF
ON
OFF
CONTOUR LOW CUTON
75Hz12k/AIR100Hz
+3dB
MIC
LINE
LEVEL
(+4dBu)
NORMAL
+40dB
OO
O
PARALLEL
REAR PANEL DESCRIPTION
5. THERMAL Indicator
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 THER-
MAL indicator turns off, and normal operation resumes.
If the SRM450 v2 keeps shutting down,
make sure there is plenty of ventilation
to the rear panel. Please see “Thermal
Considerations” on page 12.
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.
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 mini-
mizing stage noise (rumble) and microphone handling noise.
It is highly recommended that you engage this switch
when using the SRM450 v2 as a stage monitor. This allows
the bass amplifier to utilize its power for those frequencies
useful in stage monitor applications.
The SRM450 v2 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 SRM450 v2’s built-in power amplifi-
ers. Plug the linecord into an AC socket properly configured
for your particular model.
Note: If you happen to lose the AC linecord, replace-
ments are readily available at any office or computer supply
store. Always use a three-pin plug with a ground pin.
2. POWER Switch
Switch up to turn the SRM450 v2 on, and switch down to
turn it off. Make sure the level control is down before you
turn it on.
3. POWER ON Indicator
When the POWER switch is turned on, and the linecord
is connected to an active AC Mains supply, this indicator, lo-
cated 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.
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.

9
8. LEVEL
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 SRM450 v2 incorporates 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.
There is no phantom power for a mi-
crophone, so you should use a dynamic
mic, or use a condensor type if it has its
own battery power.
Follow the Quick Start guide on page 6 for setting the
LEVEL control. For most applications, it will be in the NOR-
MAL position (12 o’clock). If you have a particularly high
line-level signal connected to the SRM450 v2, 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 in-
dication (3 o’clock).
9. SIGNAL PRESENT Indicator
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.
10. PEAK Indicator
When the signal levels at the amplifier outputs approach
clipping, a soft compression circuit is activated that re-
duces the input signal. The PEAK LED lights whenever the
compression circuit is active. At this time, the SRM450 v2
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 SRM450 v2’s
LEVEL control.
Wear hearing protection if you are
close to the SRM450 v2 playing at high
levels.
11. INPUT Connector
This is a female XLR-type connector that accepts a bal-
anced or unbalanced mic- or line-level signal.
12. THRU Connector
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.

10
PLACEMENT
The SRM450 v2 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.
You can lay the cabinet down on its side and use the
SRM450 v2 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.
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.
The SRM450 v2 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.
Room Acoustics
The SRM450 v2 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.
Room acoustics play a crucial role in the overall
performance of a sound system. However, the wide high-
frequency dispersion of the SRM450 v2 helps to minimize
the problems that typically arise.
Balanced XLR Connectors
CONNECTIONS
The SRM450 v2 has a female XLR input that accepts a
balanced or unbalanced mic- or line-level signal. When con-
necting a balanced signal, be sure it’s wired per AES (Audio
Engineering Society) standards:
XLR
Hot (+) Pin 2
Cold (–) Pin 3
Shield (Ground) Pin 1
There is also a male XLR connector labeled THRU. This
allows you to connect more than one SRM450 v2 to the out-
put 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-chain-
ing multiple speakers (see diagram on page 6).
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
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 sixteen SRM450s.
This is a load of 1250 ohms (SRM450 input impedance=20
kohms; 16 of these in parallel=1250 ohms).
Since microphones typically have a higher output im-
pedance, you should limit daisy-chaining from a mic source
to two SRM450s (see the diagram on page 7).
The THRU jack is wired straight from the INPUT con-
nector — there is no electronic circuitry between — so the
signal coming out of the THRU jack is exactly the same as
the signal going in.
Top
900 Dispersion
up to 20 kHz
900

11
Here are some other placement tips:
• 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.
• Avoid placing the active speakers directly on a hol-
low 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.
• Position the active speakers so the high-frequency driv-
ers 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 frequen-
cies. By providing direct line-of-sight from the active
speakers to the audience, you increase the overall
brightness and intelligibility of the sound system.
• Highly reverberant rooms, like many gymnasiums and
auditoriums, are a nightmare for sound system intel-
ligibility. 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.
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.
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).
SRM450
Rigging Points
Both SidesBack
BottomTop
Pole
Mount
RIGGING
The SRM450 v2 cabinets are fitted with ten rigging
points as shown in the diagram below. These are M10 in-
serts. M10 threaded eyebolts (M10 x 1.5 mm x 20 mm) are
available to fit these inserts (PA-A1 Eyebolts).
WARNING: Never attempt to suspend
the SRM450 v2 active speakers by their
handles. If you want to suspend them,
use the rigging points only. Consult a
professional rigger or structural engi-
neer 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.
If you are hanging them in an inaccess-
able place, such as over a lion’s cage,
make sure that you first complete the
sound check and set the SRM450 v2
LEVEL correctly. Also set the TIMED
TURNOFF switch if you want the SRM450 v2 to turn on
when there is a signal present. It will also turn off after
three or more minutes of silence.

12
AC POWER CONSIDERATIONSTHERMAL CONSIDERATIONS
HEATSINK
THERMAL PEAK
LOW CUT
The amplifiers inside the SRM450 v2s are
convection cooled by a large heatsink.
For efficient cooling, it is important to
allow at least six inches of free space
behind the SRM450 v2.
If you use the SRM450 v2 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 frequen-
cies, while reducing the possibility of
overheating.
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.
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 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 tempera-
ture, the thermal switch will reset and the SRM450 v2 will
resume normal operation.
Be sure the SRM450 v2 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).
Under maximum SPL conditions, where musical peaks
are clipping, the SRM450 v2 120V model draws 2.5 amps on
average (1.3 amps for the 240V model). Under normal con-
ditions, the current draw is below 1 amp.
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 sus-
pected problem of “poor bass performance” is often caused
by a weak AC supply to the amplifiers.
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.
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).
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, ef-
fects processors and CD players should be connected to the
same outlet as the SRM450 v2s. 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.
DESIGNED BY MACKOIDS IN WOODINVILLE, WA,/WHITINSVILLES, MA,USA/
SHENZHEN, CHINA • MANUFACTURED IN CHINA • FABRIQUE EN CHINE
COPYRIGHT ©2007 "MACKIE", AND THE RUNNING MAN FIGURE
ARE TRADEMARKS OF LOUD TECHNOLOGIES, INC. • PATENT PENDING.
100 - 120V
50 - 60 Hz 300W
POWER
SIGNAL PRESENT
INPUTTHRU
THERMAL PEAK
TIMED TURNOFF
ON
OFF
CONTOUR LOW CUTON
75Hz12k/AIR100Hz
+3dB
MIC
LINE
LEVEL
(+4dBu)
NORMAL
+40dB
OO
ACTIVE SOUND REINFORCEMENT SYSTEM
O
PARALLEL
TRANSFORMER
120V
120V
240V
HIGH VOLTAGE POWER LINE
EARTH
GROUND
(NEUTRAL)
PRIMARY
WINDING
SECONDARY
WINDING
240V CENTER-TAPPED SECONDARY

13
For the US 120 V model:
A maximum of five SRM450 v2s can be connected per
15A service.
This allows each SRM450 v2 to be safely operated at its
maximum level.
When turning your system on, turn on the SRM450 v2s
last. This will stop any turn-on thumps and bangs from your
source equipment being amplified.
When turning off your system, turn off the SRM450 v2s
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 distribu-
tion 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.
SRM450 SRM450
Don’t use an outlet if it is wired improp-
erly! This is to protect yourself as well
as your equipment.
Never remove the ground pin on the
power cord of the SRM450 v2 or any
other component. This is very dangerous.
SRM450 v2: AC CONNECTIONS

14
SERVICE INFORMATION
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.
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 SRM450 v2 to be out-of-
phase.
As soon as the music gets loud, the SRM450 v2
shuts down!
• Be sure that the PEAK LED on the rear panel is not
lighting up frequently or continuously.
Remember to wear ear protectors if
you get close to an SRM450 v2 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 pro-
vide sufficient ventilation to the heatsink.
Bad sound!
• Is it loud and distorted? Follow the procedures de-
scribed 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.
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, documentation, and user forums. You may find
the answer to the problem without having to send your
Mackie product away.
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
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.
• 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.
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 PRES-
ENT 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.
• Is the THERMAL LED lit? Make sure there is at least
six inches of free space behind the heatsinks. Allow the
SRM450 v2 to cool off and it will turn back on.

15
join (+insulate) Balun
Balun
shield
12
3
XLRRCA 3-Conductor Cable
Noise
• 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 SRM450 v2? Use an AC line
filter or plug the SRM450 v2 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 SRM450 v2. Try some of
the following troubleshooting ideas:
• 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 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 SRM450 v2 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.
• 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):
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 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 SRM450 v2s and the hum is still there, try differ-
ent 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 prob-
lem. Do this anyway if you do not need to reproduce the
lower frequency range.

16
Repair CARE AND MAINTENANCE
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 tem-
peratures). 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 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 open-
ings of the cabinet, particularly where the drivers are
located.
For warranty repair or replacement, refer to the war-
ranty information on page 19.
Non-warranty repair for Mackie products is available
at a factory-authorized service center. To locate your
nearest service center, visit www.mackie.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, 7 am to 5 pm Pacific Time, to explain the
problem. Tech Support will tell you where the nearest
factory-authorized service center is located in your area. .
Need help with your new SRM450 v2?
• Visit www.mackie.com and click Support to find:
FAQs, manuals, addendums, and user forums.
• Email us at: [email protected].
• Telephone [phone] to speak with one of our splendid
technical support representatives, (Monday through Friday,
from 7 am to 5 pm PST).
14.8 in/376 mm
26.0 in/660 mm
14.8 in/376 mm
15.4 in/390 mm
15.4 in/390 mm

17
SRM450 SPECIFICATIONS
Line Input Power
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
Control System Function
Electronic Crossover
Phase Alignment
Equalization
Parametric Equalization
Safety Features
Over-Excursion Protection
Second-Order High-Pass Filter
Thermal Protection Amplifier shutdown, auto-reset
Low-Line Voltage Shut Down
60% Nominal line
Driver Protection Independent LF and HF compressors
Low-Freq Roll-Off Dynamic, signal-level dependent
Construction Features
Basic Design Asymmetrical Trapezoidal
Enclosure Alignment Sixth-Order
Material Polypropylene
Finish Midnight Blue, textured finish
Handles One on each side, one on top
Mounting Methods
Integrated mounting points, M10
Two each located on each side, top, bottom, and
rear of enclosure
Grille Perforated metal with weather-resistant coating
Display LEDs Signal Present, Peak, Power ON, and Thermal
Physical Properties
Height 26.0 in/660 mm
Width 15.4 in/390 mm
Depth 14.8 in/376 mm
Weight 40 lb/18 kg
Options
PA-A1 forged shoulder eyebolt hardware (M10 x 1.5 mm x 20 mm)
SPM100 (Speaker Pole Mount)
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.
“Mackie.,” the “Running Man” figure, and “FR Series” are registered
trademarks of LOUD Technologies Inc.
All other brand names mentioned are trademarks or registered
trademarks of their respective holders, and are hereby acknowledged.
©2003-2008 LOUD Technologies Inc.
All Rights Reserved.
System Specifications
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
Max SPL Peak @ 1m 127 dB
Crossover Linkwitz-Riley,
24 dB/octave @ 1600 Hz
Audio
Input Type Balanced Differential
Input Impedance 20 kohms
Input Protection RFI and level protected
Sensitivity
Line: +4 dBu (center detent)
Mic: –36 dBu
Maximum Input Level +22 dBu
Low-Cut Frequency 75 Hz, Second-order filter
Acoustic Contour Equalization
Peaking: +3 dB @ 100 Hz,
+3 dB @ 12 kHz
Operating Temperature Range
–10ºC to 45ºC (14ºF to 113ºF)
Power Amplifiers
Low-Frequency Power Amplifier
Rated Power 300 watts*
Rated THD < 0.1%
Cooling Convection Extrusion
Design Class D, Parametric Servo Feedback
High-Frequency Power Amplifier
Rated Power 100 watts*
Rated THD < 0.1%
Cooling Convection Extrusion
Design Conventional Class AB
*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
Diameter 12 in/300 mm
Voice Coil Diameter 3.0 in/75 mm
Sensitivity (1W@1m) 98 dB
Nominal Impedance 8 ohms
Power Handling 600 watts, program
Frequency Range 45 Hz – 3 kHz
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 100 watts, program
Frequency Range 1 kHz – 20 kHz
Horn Design
Type Conical and Exponential
Mouth Size 12 in/304.8 mm (W) x 7 in/177.8 mm (H)
Throat Diameter 1 in/25.4 mm
Horizontal Coverage 90º (1 kHz–20 kHz)
Vertical Coverage 45º (2.8 kHz–20 kHz)
R

18
SRM450 v2 BLOCK DIAGRAM
INPUT
THRU
2
3
1
2
J15
3
1
HI-PASS
LOW CUT CONTOUR
COMPRESSOR
THRESHOLD
COMPRESSOR
SWEEPING
FILTER
LO-PASSDELAY
176uS
HI-FREQ
40-120 Hz
LO-FREQUENCY
DRIVER
TWEE
T
LO-FREQ
AMP
HI-FREQ
AMP
SENSE
RESISTOR
BASS CONTROL SERVO LOOP
WOOF
PEAK
LIGHT
PEAK
DETECTION
MACKIE SRM450 v2 BLOCK DIAGRAM (073107)
THRESHOLD
LPF
THRESHOLD
+
–
MID VDC
+
–LO VDC
+
–
HI VDC
TOROIDAL POWER
TRANSFORMER
FUSE
POWER
SWITCH
ON
OFF
+15VDC
SIGNAL
SENSE
SIGNAL
SENSE MUTE
ON/OFF
CONTROL
MUTE MUTE
POWER
LEDS
THERMAL
LED
THERMAL
SWITCH
LOW AC
VOLTS SENSE
TIMED
TURNOFF
SIGNAL
LED

19
A. LOUD Technologies Inc. warrants all materials, workman-
ship and proper operation of this product for a period of three
years from the original date of purchase. You may purchase
an additional 24-month Extended Warranty (for a total of 60
months of coverage). Visit our website and follow the “Product
Registration” links for details (www.mackie.com). 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 deliv-
ered within the U.S. and Canada by LOUD Technologies Inc. or
its authorized dealers.
B. For faster processing (not to mention a free gift), register
online or mail in the product registration card.
C. Unauthorized service, repairs, or modification of Mackie
products will void this warranty. To obtain repairs or replace-
ment under warranty, you must have a copy of your sales
receipt from the authorized Mackie dealer where you pur-
chased the product. It is necessary to establish purchase date
and determine whether your Mackie product is within the
warranty period.
D. To obtain warranty repair or replacement:
1. Call Mackie Technical Support at 800/898-3211, 7 AM
to 5 PM Monday through Friday (Pacific Time) to get au-
thorization for repair or replacement. Alternately, go to the
Mackie website, click “Support” (www.mackie.com/sup-
port), and follow the instructions for reporting a warranty
issue and submitting a request for an advance replacement.
2. Advance Replacement: Mackie will ship a replacement
unit to you along with an invoice for the suggested retail
price of the replacement unit. You must return the defec-
tive unit immediately to cancel the invoice. If you do not
return the defective unit within 30 days, you must pay the
full amount stated in the invoice to satisfy your debt.
3. Repair: When you call Mackie Technical Support, ex-
plain the problem and obtain a Service Request Number.
Have your Mackie product’s serial number ready. You
must have a Service Request Number before you can
obtain factory-authorized service.
• Pack the product in its original shipping carton. Also
include a note explaining exactly how to duplicate the
problem, a copy of the sales receipt with price and date
showing, your daytime phone number and return street
address (no P.O. boxes or route numbers, please!), and
the Service Request Number. If we cannot duplicate the
problem or establish the starting date of your Limited
Warranty, we may, at our option, charge for service time
and parts.
• Ship the product in its original shipping carton, freight
prepaid to the authorized service center. Write the Ser-
vice Request Number in BIG PRINT on top of the box.
The address of your closest authorized service center
will be given to you by Technical Support, or it may be
obtained from our website. Once it’s repaired, the autho-
rized service center will ship it back by ground shipping,
pre-paid (if it qualified as a warranty repair).
Note: Under the terms of the warranty, you must ship or
drop-off the unit to an authorized service center. The re-
turn ground shipment is covered for those units deemed
by us to be under warranty.
Note: You must have a sales receipt from an authorized
Mackie dealer for your unit to be considered for warranty
repair.
IMPORTANT: Make sure that the Service Request Number
is plainly written on the shipping carton. No receipt, no war-
ranty service.
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.
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. LOUD Technologies and its authorized
service centers may use refurbished parts for repair or replace-
ment 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 or Canada.
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 installa-
tion, 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.
H. LOUD Technologies assumes no responsibility for the timeli-
ness of repairs performed by an authorized service center.
I. This warranty is extended to the original purchaser. This
warranty may be transferred to anyone who may subsequently
purchase this product within the applicable warranty period for
a nominal fee. A copy of the original sales receipt is required to
obtain warranty repairs or replacement.
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 Tech-
nologies or to make any warranty for LOUD Technologies Inc.
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 MERCHANT-
ABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE
WARRANTY GIVEN ON THIS PAGE SHALL BE STRICTLY
LIMITED IN DURATION TO THREE YEARS FROM THE DATE
OF ORIGINAL PURCHASE FROM AN AUTHORIZED MACKIE
DEALER. UPON EXPIRATION OF THE APPLICABLE WARRAN-
TY 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 conse-
quential 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.
Please keep your sales receipt in a safe place.
SRM450 v2 Limited Warranty

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
Fax: [phone] • www.mackie.com
E-mail: [email protected]