QSC RMX 1450

1400W, 2 Channel Power Amplifier

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True Studio Quality Sound

The RMX Series amplifiers give you clean, dynamic power with the legendary QSC sound quality and reliability that pros depend on. The RMX Series deliver unmatched performance at a breakthrough price.

Muscular Power Plant

The power supply is the heart of an amplifier, converting raw AC power from the wall to clean DC for the audio circuitry. The RMX uses a powerful high-current toroidal transformer and ample filter capacitance to ensure generous energy reserves. This makes a critical difference in sound quality, allowing the amp to effortlessly punch out high level transients, even when driving abusive 2 ohm speaker loads.

Superior Performance

RMX amplifiers deliver true studio-quality sound. A full complementary output circuit using the highest-grade linear output devices delivers ultra-low distortion (<0.05% THD) and a ruler-flat frequency response. SMT (Surface Mount Technology) triples small-signal component density, enabling us to pack up to 2400 watts of power in a chassis only 2 rack spaces and less than 16" deep. And unlike other designs, RMX output devices are direct-mounted to the heat sink for optimum thermal coupling and cooling.

Proven Reliability:

With over 30 years of building amplifiers for the largest touring companies and venues around the world, you can count on QSC's reputation for designing the most reliable amps available.

Comprehensive Features:
  • The RMX Series is packed full of professional features that increase performance and flexibility:
  • The RMX 1850HD provides improved thermal performance that gives you higher continuous power in 2 ohms stereo or 4 ohms bridged applications (a RMX 1850HD exclusive!)
  • Independent defeatable clip limiters reduce distortion without sacrificing peak performance
  • Selectable low-frequency filters boost system response, protect speakers and ensure low-end tightness by more precisely matching the amplifier's range to the loudspeakers
  • Barrier strip, XLR and 1/4" balanced inputs plus Speakon and binding post outputs provide easy connections
  • Low-noise variable speed fans with rear-to-front air flow keep amplifiers and racks cool
General Features:
  • Compact size - up to 2400 watts in 2 rack spaces
  • Professional quality performance - incorporates road-proven QSC designs
  • High-current toroidal transformers for greater two-ohm power and low noise
  • Independent user-defeatable clip limiters reduce distortion
  • Selectable low-frequency filters (30 Hz or 50 Hz) protect speakers and increase headroom
  • Balanced 1/4" (6.3mm) TRS, XLR and barrier strip inputs
  • Binding post and Neutrik Speakon outputs
  • Front mounted gain controls for easy access
  • Signal and Clip LED indicators to monitor performance
  • Independent DC and thermal overload protection on each channel automatically protects amplifier and speakers
  • 3-year Manufacturer's warranty
 
SPECIFICATIONS
RMX 850 RMX 1450 RMX 1850HD RMX 2450
  STEREO MODE (Both Channels Driven)
8 ohms
  FTC 20 Hz - 20 kHz, 0.1% THD
  EIA 1 kHz, 0.1% THD

185 W
200 W

260 W
280 W

350 W
360 W

450 W
500 W
4 ohms
  FTC 20 Hz - 20 kHz, 0.1% THD
  EIA 1 kHz, 0.1% THD

280 W
300 W

400 W
450 W

550 W
600 W

650 W
750 W
2 ohms
   EIA 1 kHz, 1% THD

430 W

700 W

900 W

1200 W
  BRIDGE MONO MODE
8 ohms
  FTC 20 Hz - 20 kHz, 0.1% THD
  EIA 1 kHz, 0.1% THD

530 W
600 W

800 W
900 W

1100 W
1200 W

1300 W
1500 W
4 ohms
   EIA 1 kHz, 1% THD

830 W

1400 W

1800 W

2400 W
Signal to Noise, 20 Hz-20 kHz 100 dB 100 dB 100 dB 100 dB
Distortion (SMPTE-IM) Less than 0.01% Less than 0.01% Less than 0.02% Less than 0.02%
Input Sensitivity @ 8 ohms 1.15V (+3.4 dBu) 1.15V (+3.4 dBu) 1.16V (+3.5 dBu) 1.23V (+4.0 dBu)
Voltage Gain 31.6x (30 dB) 40x (32 dB) 46x (33 dB) 50x (34 dB)
Output Circuitry AB AB Class H Class H
Power Requirements
1/8 power pink noise at 4 ohms *
5A 6A 6A 7A
  ALL MODELS
Distortion (Typical)
  20 Hz - 20 kHz: 10 dB below rated power
  1.0 kHz and below: full rated power

Less than 0.03% THD, 4 and 8 ohms
Less than 0.03% THD, 4 and 8 ohms
Frequency Response 20 Hz-20 kHz, ±1 dB
-3 dB points: 5 Hz - 50 kHz
Damping Factor, 1 kHz and below Greater than 300 at 8 ohms
Input Impedance 10k ohms unbalanced, 20k ohms balanced
Input Clipping 10 Vrms (+22 dB)
Cooling Continuously variable-speed fan, rear-to-front air flow
Connectors, each channel Input: Active balanced; barrier strip, XLR and 1/4" (6.3mm)
TRS tip and XLR (pin 2 positive)
Output: touch-proof binding posts and Neutrik® Speakon®
Controls Front: AC switch, Ch. 1 and Ch. 2 gain knobs
Rear: 10-position DIP switch
Indicators Power-On: Green LED
Signal: Yellow LED (1 per channel)
Clip: Red LED (1 per channel)
Amplifier Protection Stable into reactive or mismatched loads
Load Protection On/off muting, AC coupling (850, 1450), triac crowbar (1850HD, 2450, on each channel)
Power Requirements 100, 120, 230 VAC, 50-60 Hz
Dimensions 19" (48.3 cm) rack mounting, 3.5" (8.9 cm) tall (2 RU),
15.9" (40 cm) deep (rack mounting to rear support ears)
Weight 35 lbs (15.9 kg) net 40 lbs (18.2 kg) net 44.5 lbs (20.2 kg) net 44.5 lbs (20.2 kg) net

Power Specifications

Number of Channels
This is the number of channels that the professional amplifier is designed to power.
2 Channels
Continuous Power @ 8 ohm
This is the continuous (RMS) power output of the amplifier at an 8 ohm impedance.
280 watts x 2 channels
Continuous Power @ 4 ohm
This is the continuous (RMS) power output of the amplifier at an 4 ohm impedance.
450 watts x 2 channels
Continuous Power @ 2 ohm
This is the continuous (RMS) power output of the amplifier at an 2 ohm impedance.
700 watts x 2 channels
Continuous Power @ 8 ohm (Bridged)
This is the continuous (RMS) power output of the amplifier at a bridged 8 ohm impedance.
900 watts x 1 channels
Continuous Power @ 4 ohm (Bridged)
This is the continuous (RMS) power output of the amplifier at a bridged 4 ohm impedance.
1400 watts x 1 channels
Total Continuous Power
This is the total continuous power rating (RMS) that the amplifier is able to output.
1400 watts

Amplifier Specifications

Amplifier Class

An amplifier increases the power of the signal being fed to it by taking energy from its power supply and matching the signal but increasing its amplitude. Amplifiers use many different methods for converting these electrical signals and have been categorized into classes.

Class A/B: Greater than 50% of the input signal is amplified while the other percentage is “off”. These amplifiers have a small amount of current flowing through the output transistors all the time which almost eliminates crossover distortion. Class A/B has great sound quality but is not as efficient as class D. These amps are most commonly used to drive speakers.

Class D: Also known as switching amplifiers, class D amps have output transistors that are completely turned “on” or “off”. This means that when the transistors are on, there is almost no voltage across them but when they are off there is significant voltage but no current flowing through it which makes these amplifiers very efficient at the cost of sound quality. These amps are most commonly used to drive subwoofers.

Other Classes: You may see classes such as GH, bD, X, FD, etc. by some manufactures. These amplifiers tend to be either class A/B, D or a hybrid of the two but with improvements to their designs that can make them more efficient or offer better sound quality.

AB
Signal-to-Noise Ratio
This spec compares the strength of the signal to the level of background noise. A higher value indicates less background noise.
100 dB
Frequency Response
The range of frequencies the amplifier will reproduce (lowest frequency to the highest). Bigger is better, meaning the wider the range, the better. The optimal range is 20 - 20,000 Hz (which is the range of human hearing).
20 - 20000 Hz
Input Sensitivity
This is the input sensitivity of the amplifier.
1.15 volts
THD (Total Harmonic Distortion)
The amount of change in harmonic content of the signal as it is amplified. A lower figure indicates less change and a more accurate amp. THD below 0.10% is inaudible.
0.01%
Voltage Gain
This is the voltage gain of the amplifier measured in decibels.
32 dB
Cooling Options
These are the different cooling systems used in the amplifier to keep it cool.
Cooling Fan
Inputs
These are the type of input connections that the amplifier has.
1/4" TRS
Binding Posts
XLR
Outputs
These are the types of output connections that the amplifier has.
Binding Posts (Banana Clip Ready)
SpeakOn

Physical Specifications

Height
The height of the item, measured from top to bottom, in inches.
3-1/2"
Width
The width of the item from left to right (side-to-side) measured in inches.
19"
Depth
The front-to-rear depth of the item, in inches. If the item is angled or slanted, this value is the bottom measurement.
16"
Weight (Pounds)
This is the weight of the item in pounds (lbs).
35 lbs
Rackmount Spaces
This is the total number of spaces that the preamplifier will occupy when mounted on a rack.
2U

Specials with this Item

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Warranty and Return Policy

Parts Warranty Duration
3 years
Labor Warranty Duration
3 years
Warranty Provider
Manufacturer

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
100%
4 Star
0%
3 Star
0%
2 Star
0%
1 Star
0%

Average Attribution Rating

Durability
4.0
Value
4.0
Features
5.0
Design
4.0
Usability
5.0
ian

Sweden

Overall
Durability
Value
Features
Design
Usability
Good Amp

July 8, 2011

A Very Good Amp

4 of 5 found this helpful

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Product Summary

Manufacturer

Model Number

RMX 1450

Weight

25.00lbs

Internal SKU

rmx1450

Internal Product ID

32620

Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: QSC RMX 1450

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QSC RMX 1450

1400W, 2 Channel Power Amplifier

$449.99

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