QSC RMX 1450 Power Amplifier

Power Amp with 280W into 8 Ohms & 450W into 4 Ohms

Clean, dynamic power and studio-quality sound.

QSC’s RMX1450 amplifier delivers true studio-quality sound with 280w @ 8Ω/450w @ 4Ω of output power in a chassis that’s only two rack spaces high and less than 16” deep. A full complementary output circuit using the highest-grade linear output devices delivers low distortion & flat frequency response. Unlike other designs, RMX output devices are direct-mounted to the heat sink for optimum thermal coupling and cooling.

This unit also features independent defeatable clip limiters, selectable low-frequency filters, XLR and ¼” balanced inputs, Speakon™ and binding post outputs and low-noise variable speed fans.

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 RMX2450 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
RMX2450 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.

Comprehensive Features
The RMX2450 is packed full of professional features that increase performance and flexibility:

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.

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.

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 warranty plus optional 3-year extended service contract

Product Specification

STEREO MODE, both channels driven
8 ohms
FTC 20 Hz - 20 kHz 0.01% THD	260 W
EIA 1 kHz 0.1% THD	280 W
4 ohms
FTC 20 Hz - 20 kHz 0.01% THD	400 W
EIA 1 kHz 0.1% THD	450 W
2 ohms EIA 1 kHz, 1% THD	700 W
BRIDGE MONO MODE
8 ohms
FTC 20 Hz - 20 kHz 0.01% THD	800 W
EIA 1 kHz 0.1% THD	900 W
4 ohms EIA 1kHz 1% THD	1400 W

Signal to Noise (20 Hz - 20 kHz)	100 dB
Distortion (SMPTE-IM)	Less than 0.01%
Input Sensitivity @ 8 ohms	1.15V (+3.4 dBu)
Voltage Gain	40x (32 dB)
Output Circuitry	AB
Power Requirements 1/8 power pink noise at 4 ohms	6A
Typical Distortion
20 Hz - 20 kHz: 10 dB below rated power	Less than 0.03% THD, 4 and 8 ohms
1.0 kHz and below: full rated power	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	20k ohms balanced 10k ohms unbalanced
Input Clipping	10 Vrms (+22 dB)
Cooling	Continuously variable-speed fan, rear-to-front air flow
Input Connectors, each channel	3-pin XLR and 1/4" TRS balanced
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
Height	3.5" (8.9 cm) 2 rack spaces
Width	19" (48.3 cm)
Depth, Rack mounting surface to rear panel	15.9" (40 cm)
Weight	35 lbs. (15.9 kg) net