SRM450 Specifications

System
Input Type	Balanced Differential
Input Impedance	Line: 20k ohms
Input Protection	RFI and level protected
Sensitivity	Line: +4 dBu (center detent) Mic: -36 dBu
Maximum Input Level	Line: +22 dBu
Low-Cut Frequency	75Hz, Second-order filter
Acoustic Contour Equalization	Peaking: +3 dB @ 100Hz +3 dB @ 12kHz
Enclosure Alignment	Sixth-Order
Over-Excursion Protection	Second-Order High-Pass Filter
Thermal Protection	Amplifier shutdown, auto reset
Low-Line Voltage Shut Down	60% Nominal line
Frequency Range (-10 dB)	45Hz - 20KHz
Frequency Response (±3 dB)	55Hz - 18kHz
Maximum Peak SPL @ 1m	127 dB
Low-Freq Crossover	24 dB/octave, time offset corrected
High-Freq Crossover	24 dB/octave
Crossover Frequency	1.6kHz
Driver Protection	Independent LF and HF compressors
Low-Freq Roll-Off	Dynamic-signal level dependent
Accessory Interface	±15V DC, normalized signal I/O
Operating Temperature Range	-10°C to 45° C (14°F to 113°F)

Transducer
Low-Frequency Transducer:
Diameter	300mm (12")
Power Handling	450 watts RMS
Frequency Range	45Hz - 3kHz
Hi-Frequency Driver and Horn:
Diaphragm Diameter	44mm (1.75")
Exit Throat Diameter	25mm (1")
Diaphragm Material	Titanium
Sensitivity (1W@1m)	106 dB
Power Handling	100 watts RMS
Frequency Range	1kHz - 20kHz
Horn Type	Composite: Exponential and Conical
Mouth Size	305mm (12") W x 178mm (7") H
Horn Coverage :
Horizontal Coverage	90°
Vertical Coverage	45°

Power Amplifier and System
Low-Frequency Power Amplifier:
Rated Power	300 watts RMS
Rated THD	< 0.1%
Cooling	Convection Extrusion
Design	Class G, Parametric Servo Feedback
High-frequency amplifier:
Rated Power	100 watts @ High-Frequency Driver Impedance
Rated THD	< 0.1%
Cooling	Convection Extrusion
Design	Conventional Class AB

Line Input Power
US	120V, 60Hz
Europe	230V, 50Hz
Japan	100V, 50/60Hz

Physical Properties
Height	660mm (26")
Width	390mm (15.4")
Depth	376mm (14.8")
Weight	23.2kg (51 lbs.)
Enclosure Geometry	Asymmetrical Trapezoidal
Mounting Methods	Integrated mounting points, M10
Since we're always striving to make our stuff better by incorporating new and improved materials, components and manufacturing methods, we reserve the right to change these specifications at any time without notice.