QSC RMX4050a Professional Power Amplifier – 4000W, Class H, High-Efficiency Performance for Live Sound & PA Systems
Product Overview
The QSC RMX4050a is a high-performance Class H power amplifier, designed for live sound reinforcement, PA systems, and commercial audio applications. Delivering 1300W per channel at 4Ω and 800W per channel at 8Ω, the RMX4050a ensures clean, reliable power for mid-to-large speaker systems.
Featuring high-current toroidal transformers, the RMX4050a provides low noise operation and consistent power delivery, even under demanding conditions. Selectable low-frequency filters (30Hz & 50Hz) protect speakers while increasing headroom, and user-defeatable clip limiters reduce distortion for optimal sound clarity.
Key Features
- Class H Amplification – Ensures high-fidelity audio performance.
- Power Output: 1300W per channel (4Ω), 800W per channel (8Ω), 4000W bridged mono (4Ω).
- High-Current Toroidal Transformers – Provides low noise and stable power delivery.
- Selectable Low-Frequency Filters (30Hz & 50Hz) – Protects speakers and increases headroom.
- User-Defeatable Clip Limiters – Reduces distortion for cleaner audio output.
- Front Panel LED Indicators – Displays power, signal presence, and clipping status.
- Parallel XLR & 1/4-inch TRS Inputs – Ensures broad compatibility with various audio sources.
- Speakon® & Binding Post Outputs – Supports secure speaker connections.
- Compact 3U Rack Size – Fits standard rack enclosures.
Technical Specifications
| Specification | Details |
|---|---|
| Power Output (8Ω, continuous, both channels driven) | 800W per channel |
| Power Output (4Ω, continuous, both channels driven) | 1300W per channel |
| Power Output (Bridged Mono, 4Ω, continuous) | 4000W |
| Distortion (1kHz at full rated power) | <0.02% THD (8Ω), <0.05% THD (4Ω) |
| Signal-to-Noise Ratio (A-weighted, 20Hz–20kHz) | 100 dB |
| Input Sensitivity | 1.42V (+5.3 dBu) |
| Voltage Gain | 64x (36 dB) |
| Output Circuitry | Class H |
| Power Requirements (1/8 power at 4Ω, 120V) | 10.0A |
| Frequency Response (20Hz–20kHz) | +0, -1 dB |
| Dynamic Headroom (4Ω) | 2 dB |
| Input Impedance | >20kΩ (balanced) |
| Maximum Input Level | +24 dBu |
| Input Connectors (Each Channel) | 3-pin XLR, 1/4-inch TRS, RCA (phono) |
| Output Connectors (Each Channel) | Speakon®, 1/4-inch TS, Binding posts |
| Amplifier & Load Protection | Short circuit, open circuit, thermal, RF protection |
| Front Panel Controls & Indicators | Gain controls, signal LEDs, clip LEDs, power LED |
| Rear Panel Controls | Full-range/crossover switch (100Hz, 3rd order LP, 2nd order HP) |
Box Dimensions & Weight
- Dimensions: 5.25" H x 19" W x 16" D (standard rack-compatible)
- Weight: 68 lbs
Ideal Applications
- Live Sound Systems
- Professional PA Installations
- Commercial Audio Setups
