Mackie Car Speaker SRM450V2 User Manual

SRM450v2  
Powered Loudspeaker  
O W N E R ’ S M A N U A L  
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
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
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
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
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
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
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
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  
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  
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  
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  
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  
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  
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  
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  
SRM450v2 BLOCK DIAGRAM  
18  
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  
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  

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