QSC RMX850a 2-Channel Power Amplifier – 200W/ch at 8Ω, 300W/ch at 4Ω, 430W/ch at 2Ω (RMX850a)

QSC RMX850a 2-Channel Power Amplifier

(Class AB Professional Power Amp – 200W/ch @ 8Ω, 300W/ch @ 4Ω, 430W/ch @ 2Ω)

The QSC RMX850a is a rugged, professional 2-channel rackmount power amplifier designed for live sound reinforcement, DJ systems, installed audio, and touring applications. Built on QSC’s proven RMX platform, it delivers reliable, high-current output with strong headroom and stable performance even under demanding loads.

Using a Class AB amplification design with a high-current toroidal power supply, the RMX850a ensures clean, consistent audio delivery with low distortion and excellent thermal stability. It is capable of powering passive speakers in both stereo and bridged configurations, making it a versatile solution for small to medium PA systems.

With 200W per channel at 8Ω, 300W per channel at 4Ω, and up to 430W per channel at 2Ω, the RMX850a is built to handle real-world live sound conditions where durability and reliability matter more than complexity.

Key Features

• 2-channel Class AB professional power amplifier
• 200W per channel @ 8Ω / 300W per channel @ 4Ω / 430W per channel @ 2Ω
• 830W bridged mono output (4Ω) for higher power applications
• High-current toroidal transformer power supply for stable performance
• Front-panel gain controls for quick level adjustment
• Independent channel signal and clip LED indicators
• Selectable low-frequency filters (30 Hz / 50 Hz) for speaker protection
• User-defeatable clip limiters to reduce distortion and protect speakers
• Balanced XLR, 1/4” TRS, and barrier strip inputs for flexible connectivity
• Speakon and binding post outputs for professional speaker connections
• Forced-air cooling system (front-to-rear airflow) for thermal reliability
• 2RU rackmount chassis for standard rack installation
• Ideal for live sound, DJ setups, bands, and installed PA systems