SRM450

The Mackie Designs 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 woofers 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 SMR450 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
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 RCF Precision 1.75-inch titanium compression driver Servo feedback controlled RCF Precision 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

Features

Applications
Live and playback applications Small to medium sized protable PA systems Corporate events Houses of worship

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SPEAKER
System Acoustic Frequency Response (3 dB) Frequency Range (10 dB) Directivity Factor; Q (DI)

Active Speaker System

Low Frequency Section Number of Drivers Woofer Diameter Voice Coil Diameter Power Handling Sensitivity Frequency Range Magnet Type

SRM450 Specifications

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 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 10C to 45C (14F to 113F) 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 transducers rated impedance @ 1 kHz for the HF amplifier and @ 100 Hz for the LF amplifier
in/300 mm 2.5 in/63 mm 450 watts rms (long term)dB (1W@1m) 45 Hz to 3000 Hz Ferrite
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 Line Input Power Power Consumption US Recommended amperage service Europe Recommended amperage service Japan Recommended amperage service AC connector Control System Function Electronic Crossover Phase Alignment Equalization Parametric equalization Safety Features Protection 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 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
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
1.75 in/44.5 mm 1.0 in/24.5 mm 100 watts rms (long term)dB (1W@1m) 1000 Hz to 20 kHz 8 ohms Damped titanium Ferrite 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
Display LEDs Physical Height Width Front Depth Weight
Options PA-A1 Eyebolt (M10 x 1.5 mm x 20 mm)
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.

90 120

SRM450 Vertical Polars

120 60

30 200Hz

30 500Hz

250Hz 315Hz 400Hz

630Hz 800Hz 1kHz

30 1.25kHz

30 3.15kHz

1.6kHz 2kHz 2.5kHz

4kHz 5kHz 6.3kHz

240 270
SRM450 Vertical Off-Axis Frequency Response (UP)

Attenuation (dB)

0 deg 10 deg

20 deg 30 deg

10kHz 12.5kHz 16kHz

40 deg

Frequency (Hz)
SRM450 Vertical Off-Axis Frequency Response (DOWN)

10000 20000

SRM450 Horizontal Polars

60 200Hz 250Hz 90 270

60 500Hz 630Hz 90 800Hz 1kHz

315Hz 400Hz

60 1.25kHz 1.6kHz 90 270
60 3.15kHz 4kHz 90 5kHz 6.3kHz

2kHz 2.5kHz

210 180

60 8kHz 10kHz 90

12.5kHz 16kHz
SRM450 Horizontal Off-Axis Frequency Response
Attenuation (dB) 0 deg 10 deg
SRM450 Frequency Response On-Axis
SPL, 100 dB @ 1kHz (ref.)
SRM450 Beamwidth vs. Frequency

SRM450 Directivity Index

6 dB Beamwidth (degrees)

Vert BW Horz BW

1 20000

SRM450 Input Panel

THERMAL PEAK SIGNAL PRESENT

NORMAL (+4dBu)

ACTIVE SOUND REINFORCEMENT MONITOR SYSTEM

ON OFF

LINE 100Hz 12k/AIR 75Hz

MIC +40dB

TIMED TURNOFF ON

CONTOUR +3dB

LOW CUT

120 VAC 60HZ 320W

MACKIE DESIGNS INC WOODINVILLE WA USA MADE IN USA

THRU PARALLEL

SRM450 Dimensions
15.4 in/390 mm 14.8 in/376 mm

15.4 in/390 mm

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Directivity Factor (Q)

Directivity Index (DI), dB

26.0 in/660 mm

14.8 in/376 mm
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 accomodate 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 polyproylene 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 Designs SRM450.
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 HI-PASS HI-FREQ COMPRESSOR

HI-FREQ AMP

J15 INPUT 1 THRU 3

SIGNAL LED

THERMAL LED

POWER LEDS

SIGNAL SENSE
THERMAL SWITCH LOW AC VOLTS SENSE

+15VDC

MUTE ON/OFF CONTROL

PEAK DETECTION

PEAK LIGHT

TIMED TURNOFF

40-120 Hz DELAY

LO-PASS COMPRESSOR

LO-FREQUENCY DRIVER

POWER SWITCH

SWEEPING FILTER

LO-FREQ AMP

+ MID VDC

+ HI VDC

THRESHOLD

BASS CONTROL SERVO LOOP

TOROIDAL POWER TRANSFORMER + LO VDC

SENSE RESISTOR

MACKIE DESIGNS SRM450 BLOCK DIAGRAM (#060322SEDF)
Electronic files for this product available at: www.mackie.com This Specification Sheet Owner/Operators Manual CADD files SRM450_SS.PDF SRM450_OM.PDF SRM450.DXF

www.mackie.com

16220 Wood-Red Road NE, Woodinville, WA 98072 USA 888.337.7404, fax 425.487.4337, sales@mackie.com
Mackie Designs 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 Mackie product may differ in some respect from its published description, but will always equal or exceed the original design specifications unless otherwise stated. 1999-2003 Mackie Designs Inc. All rights Reserved. Mackie and the Running Man figure are registered trademarks of Mackie Designs Inc. Part No. 091-221-00 Rev. A 4/03
UK +44.1268.571.212, fax +44.1268.570.809, uk@mackie.com ITALY +39.0522.354.111, fax +39.0522.926.208, italy@mackie.com FRANCE +33.3.85.46.91.60, fax +33.3.85.46.91.61, france@mackie.com GERMANY +49.2572.96042.0, fax +49.2572.96042.10, germany@mackie.com

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