Transducer Specifications
Low-Frequency Transducer:
Diameter: 300mm (12")
Voice Coil Diameter: 63.5mm (2.5")
Sensitivity: (1W@1m) 98 dB
Nominal Impedance: 8 ohms
Power Handling: 300 watts
Frequency Range: 55Hz - 3000Hz

Hi-Frequency Driver and Horn:
Diaphragm Diameter: 44.5mm (1.75")
Exit Throat Diameter: 24.5mm (1")
Diaphragm Material: Titanium
Sensitivity (1W@1m): 106 dB
Nominal Impedance: 8 ohms
Power Handling: 100 watts
Frequency Range: 1000Hz - 20,000Hz
Horn Type Composite: Exponential and Conical
Mouth Size (W x H): 304.8 x 177.8 mm (12 x 7 in.)
Horizontal Coverage: 90 degrees (1kHz - 20kHz)
Vertical Coverage 45 degrees (2.8kHz - 20kHz)

Power Amplifier and System Specifications
Low-Frequency Power Amplifier:
Rated Power: 300 watts
Rated THD: < 0.03%
Cooling Convection: Extrusion
Design Class: G, Parametric Servo Feedback

High-Frequency Amplifier:
Rated Power: 100 watts
Rated THD: < 0.03%
Cooling Convection: Extrusion
Design: Conventional Class AB

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

Physical Properties
- Dimensions (H x W x D): 660 x 390 x 376 mm (25.98 x 15.35 x 14.8 in.)
- Weight: 23.2 kg (51 lbs.)
- Enclosure: Geometry Asymmetrical Trapezoidal
- Mounting Methods: Integrated mounting points, M10

System Specifications
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
Acoustic Frequency Response: 55Hz - 20,000Hz
Low-Freq: -3 dB Point 55Hz
Maximum SPL @ 1m: 127 dB
Low-Freq Crossover: 24 dB/octave, time offset corrected
High-Freq Crossover: 24 dB/octave
Crossover Frequency: 1600Hz
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 degrees to 45 degrees Celsius
(14 degrees to 113 degrees Fahrenheit)

Mackie SRM450 PA Speaker

Mackie's SRM450 is so precise, so powerful, and so easy to use, they refuse to call it a PA speaker. Active technology finally makes it possible for you to exercise listening criteria reserved for high-end studio monitors in a live sound environment. And since Mackie is the one unleashing the world's first active sound reinforcement monitor, you can be sure it's affordable.

The SRM450 active sound reinforcement monitor brings truckloads of power to any event, eliminating the need for external amplification and costly electronics (such as processors). In fact, this new Mackie loudspeaker - the first in a series of speakers developed with RCF, who has 50 years of speaker experience - uses technology and features found in systems costing thousands of dollars.

From beginning musicians to AV rental houses and everywhere in between, anyone who uses a PA will find the SRM450 to be the workhorse sound reinforcement solution. Everything you need for sound reinforcement - aside from the mixer (and they have those, too) - is in the SRM450. Take a look toward the top of this great-looking monitor and you'll notice the UltraWide Dispersion horn. Designed to deliver high frequency sounds across a spacious horizon, the SRM450 can be heard clearly by every person in the audience. Left, right, or behind that big post toward the back of the room, the crowd can hear it all.

You won't break your back hauling it around, either, thanks to the high-impact composite enclosure. Handles on both sides and on top make it easy to carry.

What's more, the SRM450 can be pole-mounted, flown, or even used as a floor wedge. In fact, the SRM450's asymmetrical geometry and wide-dispersion, studio-quality horn provide unobtrusive sight lines and optimized stage monitoring performance.

They've packed so many features, so much performance and versatility into the SRM450, you'll have to hear and see it for yourself. And they guarantee: once you do, you'll never have any question about who to trust your sound to.