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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 Grey, 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 51 lb/23.2 kg
Options
PA-A1 forged shoulder eyebolt hardware
(M10 x 1.5 mm x 20 mm)
Disclaimer
Since we are always striving to make our
products better by incorporating 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 trade-
marks or registered trademarks of their respective
holders, and are hereby acknowledged.
©2003 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
Accessory Interface ± 15 VDC,
normalized signal I/O
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 G, 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 @ 1 kHz for the HF amplifier and @ 100 Hz
for the LF amplifier.
Transducers
Low-Frequency Transducer
Diameter 12 in/300 mm
Voice Coil Diameter 2.5 in/63 mm
Sensitivity (1W@1m) 98 dB
Nominal Impedance 8 ohms
Power Handling 450 watts, program
Frequency Range 45 Hz – 3 kHz
High-Frequency Transducer
Diaphragm Diameter 1.75 in/44.5 mm
Diaphragm Material 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)