Mackie SRM 450 Quick start guide

Mackie SRM 450 Quick start guide
 The Mackie SRM450 is a full range, portable, active
loudspeaker system providing high output, wide dispersion, and low distortion performance in a compact, composite molded enclosure. Two amplifiers independently
power a high precision 12-inch professional woofer and
1.75-inch diaphragm titanium compression driver with a
1-inch exit throat. A sophisticated electronic control system provides phase correction, crossover, and five modes
of thermal and active system protection.
 The SRM450 is fitted with a specially designed horn
assembly that combines both an exponential and conical
geometry. With the addition of a multi-cell horn throat
aperture, the complete assembly provides unparalleled
dispersion characteristics. The result is super smooth, lowdistortion linear audio performance across the entire specified coverage angle of 90 degrees.
 A servo feedback circuit has been added to the lowfrequency amplifier in order to provide extended bass
response and woofer control. This design provides simultaneous positive and negative signal feedback information
from the woofer’s magnetic circuit to the low-frequency
amplifier. This loop locks the two devices together and
provides extreme control of the woofer mass. The result is
extended linear movement of the woofer cone resulting in
very high SPL low-frequency output levels.
 Careful attention has been given to the ergonomic features of the system. The center of gravity, handle locations, handle design, position of fly-points, and ease of
use have been carefully thought out. There is also an integrated pole mount on the bottom of the cabinet and a
weather-resistant steel grille. The asymmetrical trapezoidal cabinet has been designed to provide an ideal floor
monitoring position.
 The SRM450 features a number of unique control features including a single microphone and line-level control
in addition to a high-pass filter for floor monitoring applications, an AC timed turn off function that is ideal for fixed
or remote installations, and a contour switch for low-level
or background-level sound reinforcement applications.
 The SRM450 cabinet is constructed of high pressure
injected polypropylene. The enclosure features ample
amounts of reinforcement ribbing and structural strengthening resulting in a strong, super-rigid design providing
ideal acoustical characteristics.
Active 2-Way Sound
Reinforcement Speaker System
SRM450
SRM450
SPEAKER
SRM450
Features
Bi-amplification with 300 watts rms low-frequency
and 100 watts rms high-frequency power
127 dB peak SPL
Wide dispersion, studio-quality high-frequency
horn with multi-cell aperture throat
Large format exponential/conical high-frequency
horn mouth
State-of-the-art precision 1.75-inch titanium
compression driver
Servo feedback controlled 12-inch high-efficiency,
light mass woofer
Single mic/line level control
High-pass switch for floor monitoring applications
Contour switch provides ideal low to medium
level music playback equalization
Timed turn-off AC switch
Complete electronic and component protection
circuitry
Electronic equalization and phase alignment
Professional trapezoidal enclosure design
Built-in pole mount cup on bottom
Tilts on its side for use as a stage monitor
Correctly weight-balanced with two comfortable side handles for easy carrying and set up
Applications
 Live and playback applications
 Small to medium sized portable PA systems
 Corporate events
 Houses of worship
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SPEAKER
SRM450
SRM450
Active Speaker System
SRM450 Specifications
System Acoustic
Frequency Response (–3 dB)
Frequency Range (–10 dB)
Directivity Factor; Q (DI)
Low Frequency Section
Number of Drivers
Woofer Diameter
Voice Coil Diameter
Power Handling
Sensitivity
Frequency Range
Magnet Type
Audio
Input
Bal./unbal. Female XLR
Loop-through (parallel w/input)
Bal./unbal. Male XLR
Input Protection
RFI and level protected
Level Control
Rotating knob (off to +40 dB)
Sensitivity (center detent)
Line: +4 dBu
Mic: –36 dBu
Maximum Input Level
+22 dBu
Low-Cut Frequency
75 Hz
second-order high-pass filter
Acoustic Contour Equalization (peaking) +3 dB @ 100 Hz
+3 dB @ 12 kHz
Accessory Interface
±15 VDC, normalized signal I/O
Operating Temperature Range
–10°C to 45°C
(14°F to 113°F)
Construction Features
Basic Design
Asymmetrical Trapezoidal
Material
Polypropylene
Finish
Grey, textured finish
Handles
Two on sides, one on top
Grille
Perforated metal with weatherresistant coating
55 Hz-18 kHz
45 Hz-20 kHz
9.95 (9.98), averaged
2 kHz to 10 kHz
Max SPL Long-term
124 dB
Max SPL Peak
127 dB
Crossover
Linkwitz-Riley, 24 dB/octave @ 1600 Hz
Amplifiers
Total Amplifier Power
400 watts continuous*
High Frequency
100 watts*
Type
Class AB
Rated THD
.03%
Low Frequency
300 watts*
Type
Class G with parametric servo feedback
Rated THD
0.03%
*Rated power is continuous rms wattage into transducer’s rated impedance @ 1 kHz for
the HF amplifier and @ 100 Hz for the LF amplifier
High Frequency Section
Diaphragm Size
Horn Exit Diameter
Power Handling
Sensitivity
Frequency Range
Nominal Impedance
Diaphragm Material
Magnet Type
Horn Design
Horizontal Coverage
Vertical Coverage
Type
Mouth Size
Throat size
1
1.75 in/44.5 mm
1.0 in/24.5 mm
100 watts rms (long term)1
106 dB ([email protected])
1000 Hz to 20 kHz
8 ohms
Damped titanium
Ferrite
90° 1 kHz to 20 kHz avg.
45° 2.8 kHz to 20 kHz avg.
Exponential and conical
12.0 in x 7.0 in/
30.5 cm x 17.8 cm
1.0 in/2.5 cm
Measured on-axis in the far field, referenced back to 1 watt rms from maximum power and to 1 meter distance using the inverse square law.
Line Input Power
Power Consumption
US
Recommended amperage service
Europe
Recommended amperage service
Japan
Recommended amperage service
AC connector
1
12 in/300 mm
2.5 in/63 mm
450 watts rms (long term)1
98 dB ([email protected])
45 Hz to 3000 Hz
Ferrite
320W with musical program
and Peak LED blinking
120 VAC, 60Hz
2.5 amps
230 VAC, 50Hz
1.25 amps
100 VAC, 50/60Hz
3.0 amps
3-pin IEC 250 VAC
Control System Function
Electronic Crossover
Phase Alignment
Equalization
Parametric equalization
Safety Features
Protection
Display LEDs
Physical
Height
Width Front
Depth
Weight
Low Frequency Dynamic Bass
Protection, Independent LF and HF
Compressors, Power Supply and
Amplifier Thermal Protection
Signal Present, Peak, Power ON, and
Thermal (Cool Down Auto Reset)
26.0 in/660 mm
15.4 in/390 mm
14.8 in/376 mm
51.0 lb/23.2 kg
Options
PA-A1 Eyebolt (M10 x 1.5 mm x 20 mm)
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SRM450
Active Speaker System
SRM450 Vertical Polars
90°
90°
60°
120°
60°
120°
150°
150°
30°
30°
500Hz
200Hz
180°
–36
–12
0°
250Hz
315Hz
180°
–36
–12
630Hz
0°
800Hz
1kHz
400Hz
210°
210°
330°
240°
330°
240°
300°
300°
270°
270°
90°
90°
60°
120°
60°
120°
150°
150°
30°
30°
1.25kHz
180°
–36
–12
0°
1.6kHz
2kHz
3.15kHz
180°
–36
–12
4kHz
0°
5kHz
2.5kHz
210°
6.3kHz
210°
330°
240°
330°
240°
300°
270°
300°
270°
SRM450 Vertical Off-Axis Frequency
Response (UP)
90°
60°
120°
10
150°
8kHz
180°
–36
–12
0°
10kHz
Attenuation (dB)
30°
12.5kHz
16kHz
0 deg
0
10 deg
20 deg
–10
30 deg
–20
40 deg
–30
20
100
1000
10000
20000
Frequency (Hz)
210°
330°
240°
300°
SRM450 Vertical Off-Axis Frequency
Response (DOWN)
10
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Attenuation (dB)
270°
0 deg
0
–10 deg
–20 deg
–10
–30 deg
–20
–40 deg
–30
20
100
1000
Frequency (Hz)
10000
20000
SRM450
Active Speaker System
SRM450 Horizontal Polars
0°
330°
0°
330°
30°
–12
30°
–12
60°
300°
–36
60°
300°
–36
200Hz
500Hz
250Hz
90°
270°
630Hz
90°
270°
315Hz
400Hz
240°
1kHz
240°
120°
210°
120°
210°
150°
150°
180°
180°
0°
330°
800Hz
0°
330°
30°
–12
30°
–12
60°
300°
–36
60°
300°
–36
1.25kHz
3.15kHz
1.6kHz
90°
270°
4kHz
90°
270°
2kHz
2.5kHz
240°
6.3kHz
240°
120°
210°
5kHz
120°
210°
150°
180°
150°
180°
0°
330°
30°
–12
60°
300°
–36
8kHz
10kHz
90°
270°
12.5kHz
SRM450 Horizontal Off-Axis
Frequency Response
16kHz
10
240°
210°
150°
180°
Attenuation (dB)
120°
0 deg
0
10 deg
20 deg
–10
30 deg
–20
–30
20
40 deg
100
1000
Frequency (Hz)
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10000
20000
SRM450
Active Speaker System
SRM450 Frequency Response On-Axis
SPL, 100 dB @ 1kHz (ref.)
110
100
90
80
70
20
100
1000
10000
20000
Frequency (Hz)
Directivity Index (DI), dB
–6 dB Beamwidth (degrees)
20
300
240
180
120
60
0
20
Vert BW
Horz BW
100
1000
10000
SRM450 Directivity Index
100
10
10
0
20
20000
100
1000
Frequency (Hz)
Frequency (Hz)
SRM450 Input Panel
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DESIGNED BY MACKOIDS IN WOODINVILLE, WA • USA
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SRM450 Dimensions
15.4 in/390 mm
14.8 in/376 mm
14.8 in/376 mm
26.0 in/660 mm
15.4 in/390 mm
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10000
1
20000
Directivity Factor (Q)
SRM450 Beamwidth vs. Frequency
360
SPEAKER
SRM450
SRM450
Active Speaker System
Architects’ and Engineers’ Specifications
The active two-way, full-range loudspeaker system
shall incorporate one 12-inch low-frequency (LF) transducer and a 1-inch exit/1.75-inch diaphragm compression
driver high-frequency (HF) transducer. The LF driver shall
be mounted in a vented polypropylene molded enclosure
tuned for optimum low-frequency response. The HF transducer shall be loaded on a multi-cell horn aperture and
mounted on a combination exponential and conical horn.
The system shall have a nominal coverage pattern of
90° (horizontal) x 40° (vertical). System frequency response
shall vary no more than ±3 dB from 55 Hz to 18 kHz
measured on axis. The loudspeaker shall incorporate a
Class G low-frequency amplifier capable of delivering 300
watts rms over a frequency range of 20 Hz-2000 Hz. The
system shall incorporate a Class AB 100 watt rms amplifier specifically designed to power the HF driver over the
range of 1500 Hz-20 kHz. The amplifiers shall be mounted
on an aluminum heatsink, which shall be mounted on the
rear of the speaker system, and shall be convection cooled.
SRM450 Block Diagram
THRESHOLD
LOW CUT
CONTOUR
J15
HI-PASS
HI-FREQ
2
INPUT
1
HI-FREQ
AMP
3
TWEET
COMPRESSOR
2
THRU
1
3
THERMAL
LED
SIGNAL
LED
SIGNAL
SENSE
THERMAL
SWITCH
LOW AC
VOLTS SENSE
+15VDC
POWER
LEDS
MUTE
ON/OFF
CONTROL
MUTE
MUTE
PEAK
DETECTION
TIMED
TURNOFF
OFF
SIGNAL
SENSE
40-120 Hz DELAY
ON
FUSE
PEAK
LIGHT
Thermal protection shall be provided by a thermal
sensor mounted on the heatsink, which monitors the
heatsink temperature and triggers the thermal protection
circuit should the temperature exceed 158° F (70° C). The
Thermal LED shall light and the input signal to the amplifiers shall be muted until the heatsink cools to a safe operating level, at which point the thermal protection circuit
auto-resets and normal operation resumes.
Overload protection for the LF driver shall be provided
by a dynamically variable high-pass filter, the corner frequency of which shall slide from 40 Hz to 120 Hz as the LF
amplifier output approaches clipping. Additional protection shall be provided for both the LF and HF drivers by a
compressor circuit, which monitors the low-frequency and
high-frequency amplifier outputs and reduces the gain as
the amplifiers approach clipping.
The system shall include an XLR input connector, an
XLR loop-through signal connector, a level control capable
of providing up to 40 dB of gain to accommodate both
microphone and line-level signal levels, a sound contour
switch providing +3 dB of equalization at 100 Hz and 12 kHz,
a high-pass switch for filtering out frequencies below 75 Hz,
and a timed turn-off switch for self shut-down.
The loudspeaker enclosure shall have an asymmetrical
trapezoidal shape and shall incorporate 10 integrated
M10 fly points, two side handles, and a top relocation
handle. The enclosure shall be molded from polypropylene
material. The front of the loudspeaker shall be covered with
a powder coated, weather-resistant perforated steel grille.
The active two-way full-range loudspeaker system shall
be a Mackie SRM450.
SWEEPING
FILTER
POWER
SWITCH
+
MID VDC
–
+
HI VDC
–
LO-FREQUENCY
DRIVER
LO-PASS COMPRESSOR
176uS
LO-FREQ
AMP
THRESHOLD
LPF
WOOF
THRESHOLD
BASS CONTROL SERVO LOOP
TOROIDAL POWER
TRANSFORMER
+
LO VDC
–
SENSE
RESISTOR
MACKIE
SRM450
BLOCK DIAGRAM
(#060322SEDF)
Electronic files for this product available at:
www.mackie.com
This Specification Sheet
Owner/Operator’s Manual
SRM450_SS.PDF
SRM450_OM.PDF
LOUD Technologies continually engages in research related to product improvement. New material,
production methods, and design refinements are introduced into existing products without notice as a
routine expression of that philosophy. For this reason, any current LOUD Technologies product may differ
in some respect from its published description, but will always equal or exceed the original design specifications unless otherwise stated. ©1999-2004 LOUD Technologies Inc. All rights reserved. Mackie and
the “Running Man” figure are registered trademarks of LOUD Technologies Inc.
www.mackie.com
16220 Wood-Red Road NE, Woodinville, WA 98072 USA
800.898.3211, fax 425.487.4337, [email protected]
UK +44.1268.570.808, fax +44.1268.570.809, [email protected]
Part No. 091-221-00 Rev. B 09/04
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