QSC rmx 4050HD power amplifier

QSC RMX Series RMX4050HD Power Amplifier

QSC RMX 4050HD POWER AMPLIFIER /BOOSTERoffer true professional quality performance at an affordable price. Four 2-rackspace models range in power from 430 to 1200 watts per channel at 2 ohms. Two 3-rackspace models provide 2000 to 2500 watts per channel at 2 ohms.

All six models feature a compact chassis less than 16″ deep. RMX amplifiers include a comprehensive set of features including XLR and 1/4″ balanced inputs, Speakon® and binding post outposts for convenient connectivity. User-defeatable clip limiters and selectable low frequency filters optimize sonic performance.

RMX4050HD

Like its smaller sibling (the RMX1850HD), the RMX4050HD is one of two RMX “heavy duty” models designed to work as hard into 2 ohm loads as most competing amplifiers will at 4 ohms.

Both the RMX5050 and RMX4050HD feature a three-tier, Class H design that is extremely efficient at real world power levels. Less AC current is wasted and more available current goes into producing useful audio power. 120 volt versions of the RMX4050HD accomplish all this with a standard 15 amp plug.

Features

• Professional quality performance—incorporates road-proven QSC designs

• The 4000 watt RMX4050HD operates on a standard 15 amp plug (120V)

• Both the RMX4050HD and RMX5050 feature a dual mono, high current power supply for increased reliability and performance

• The RMX1850HD and RMX4050HD provide improved thermal performance yielding higher continuous power in 2 ohm stereo or 4 ohm bridged applications (a RMX HD exclusive!)

• Compact size—up to 2400 watts in 2 rack spaces or 5000 watts in 3 rack spaces

• High-current toroidal transformers for greater 2 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″ (6.3 mm) TRS, XLR, and barrier strip inputs

• Touch-proof 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

Power Amplifier Specifications

The QSC RMX Series RMX 4050 Power Amplifier is a top-tier audio amplification solution designed to deliver exceptional power, clarity, and reliability for professional audio applications. As part of QSC’s highly regarded RMX Series, the RMX 4050 offers robust performance, versatile features, and durable construction, making it ideal for live sound reinforcement, permanent installations, and studio use. This comprehensive product description will explore the amplifier’s key features, technical specifications, design, performance capabilities, and practical applications.

Power and Performance

• High Power Output: The RMX 4050 delivers substantial power, with 850 watts per channel into 8 ohms, 1300 watts per channel into 4 ohms, and 2000 watts per channel into 2 ohms. In bridged mono mode, it provides an impressive 2600 watts into 8 ohms and 4000 watts into 4 ohms.
• Class H Architecture: This design enhances efficiency by providing high power with reduced heat output, ensuring consistent performance even under demanding conditions.
• High Current Capacity: The RMX 4050 can deliver high current to drive demanding speaker loads, maintaining clarity and definition across the full audio spectrum.

Build Quality and Reliability

• Rugged Construction: The amplifier features a robust steel chassis designed to withstand the rigors of both touring and fixed installations. Its durable construction ensures long-term reliability and consistent performance.
• Efficient Cooling: The RMX 4050 employs a sophisticated cooling system with a variable-speed fan and rear-to-front airflow, preventing overheating and ensuring stable operation under heavy use.
• Protection Circuitry: Comprehensive protection mechanisms guard against DC faults, infrasonic frequencies, thermal overload, and short circuits, safeguarding both the amplifier and connected speakers.

Connectivity and Controls

• Balanced XLR and 1/4″ TRS Inputs: These inputs offer flexible connectivity options, making it easy to integrate the RMX 4050 into various audio systems.
• Binding Post and SpeakON Outputs: The amplifier provides secure and reliable connections to speakers, with SpeakON connectors ensuring a robust connection capable of handling high power levels.
• User-Friendly Controls: The front panel includes detented gain controls for precise adjustment, along with signal and clip LED indicators for easy monitoring of performance and status.

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Power Ratings

• Stereo Mode (per channel):
  • 8 ohms: 850 watts
  • 4 ohms: 1300 watts
  • 2 ohms: 2000 watts
• Bridged Mono Mode:
  • 8 ohms: 2600 watts
  • 4 ohms: 4000 watts

Frequency Response

• 20 Hz to 20 kHz: ±0.5 dB

Signal-to-Noise Ratio

• 105 dB: Below rated output (20 Hz to 20 kHz, unweighted)

Total Harmonic Distortion (THD)

• <0.03%: (20 Hz to 20 kHz, 10 dB below rated output)

Damping Factor

• >500: (20 Hz to 400 Hz)

Input Sensitivity and Impedance

• 1.2V RMS: for 8 ohms
• 10 kΩ: balanced
• 5 kΩ: unbalanced

Slew Rate

• 30 V/μs

Exterior Design

The QSC RMX 4050 Power Amplifier features a sleek, professional design with a rugged metal chassis that ensures durability and reliability. The front panel is equipped with intuitive controls and indicators, while the rear panel provides all necessary connectivity options.

Front Panel

• Power Switch: Located on the left side for easy access.
• Gain Controls: Detented knobs for each channel allow for precise adjustment of input levels.
• LED Indicators: Signal, clip, and protect indicators for each channel provide at-a-glance monitoring of the amplifier’s status.

Rear Panel

• Input Connectors: Balanced XLR and 1/4″ TRS inputs offer flexible connectivity options.
• Output Connectors: Binding posts and SpeakON connectors provide secure speaker connections.
• Mode Switches: Allow selection of stereo, parallel, and bridged mono modes.
• Low-Frequency Filter Switches: Selectable 30 Hz and 50 Hz low-cut filters help remove unwanted low-frequency rumble.

Live Sound Reinforcement

The QSC RMX 4050 is an excellent choice for live sound reinforcement applications, providing the power and reliability needed for demanding environments. Its high power output and robust design make it suitable for a variety of venues, from small clubs to large outdoor events.

Permanent Installations

For permanent installations, the RMX 4050 offers reliable performance and long-term durability. Its efficient cooling system ensures stable operation even in environments with limited ventilation, and its protection circuitry provides peace of mind by safeguarding against common issues such as thermal overload and short circuits.

Studio Use

In the studio, the RMX 4050 excels in providing clean, high-fidelity amplification for monitoring systems. Its low total harmonic distortion and high signal-to-noise ratio ensure accurate audio reproduction, making it a valuable tool for mixing and mastering engineers.

Initial Setup
Setting up the QSC RMX 4050 is straightforward. Begin by connecting the amplifier to your audio source using either the balanced XLR or 1/4″ TRS inputs. Next, connect your speakers using the binding post or SpeakON outputs. Ensure that the amplifier is set to the appropriate mode (stereo, parallel, or bridged mono) and that the low-frequency filters are configured as needed.

Powering On and Adjustments
Once all connections are secure, power on the amplifier using the front panel switch. Use the gain controls to adjust the input levels, monitoring the signal and clip LED indicators to ensure optimal performance without distortion. If necessary, engage the low-frequency filters to remove unwanted low-end rumble.

Monitoring and Maintenance
Regularly check the amplifier’s performance by observing the front panel indicators and listening for any signs of distortion or anomalies. Periodic maintenance, such as cleaning the fan and vents, will help ensure long-term reliability and performance.

High-Quality Sound

The RMX 4050’s Class H topology and high slew rate contribute to its excellent sound quality, characterized by clear highs, detailed mids, and tight, controlled bass. Its low total harmonic distortion ensures that your audio remains clean and accurate, even at high power levels.

Reliability and Durability

With its rugged construction and comprehensive protection circuitry, the RMX 4050 is built to last. Whether used in a mobile rig or a permanent installation, it delivers consistent performance and can withstand the demands of professional use.

Versatility

The RMX 4050’s versatile connectivity options, mode selection, and low-frequency filters make it suitable for a wide range of applications. From live sound and installations to studio monitoring, this amplifier can handle diverse audio needs with ease.

Cost-Effective

Despite its professional-grade features and performance, the RMX 4050 is priced competitively, offering excellent value for money. It provides high-end audio quality and reliability at a fraction of the cost of some other professional amplifiers.

Houses of Worship

The RMX 4050 is well-suited for houses of worship, where clear, powerful sound reinforcement is essential for delivering sermons, music, and other audio content. Its high power output ensures that sound reaches every corner of the space, while its reliability ensures consistent performance week after week.

Theaters and Auditoriums

In theaters and auditoriums, the RMX 4050 provides the power and clarity needed for both spoken word and musical performances. Its ability to drive large speaker systems makes it ideal for these venues, ensuring that every seat in the house receives clear, detailed sound.

Clubs and Bars

For clubs and bars, where high-energy music and robust sound systems are crucial, the RMX 4050 delivers the power and performance needed to keep the party going. Its rugged construction and efficient cooling system make it well-suited for the demanding environment of live music venues.