QSC RMX850a User Manual

Pages 65

Year 2013

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QSC RMX850a Specification

The QSC RMX850a Amplifier is a robust and versatile power amplifier designed for professional audio applications. It delivers high-quality sound performance, boasting a power output of 200 watts per channel at 8 ohms, 300 watts per channel at 4 ohms, and 430 watts per channel at 2 ohms. In bridged mono mode, it offers 600 watts at 8 ohms and 830 watts at 4 ohms, making it suitable for various audio setups from small venues to larger installations.

The RMX850a features a class AB topology, ensuring smooth and reliable audio reproduction with minimal distortion. It incorporates an efficient cooling system with a variable-speed fan, providing optimal thermal management and ensuring the amplifier operates reliably even under demanding conditions. The amplifier's frequency response ranges from 20 Hz to 20 kHz, maintaining audio fidelity across the entire spectrum.

Connectivity options include XLR and 1/4-inch TRS inputs, along with binding post and Speakon outputs, offering flexibility in integration with different audio systems. The front panel is equipped with gain controls for each channel and LED indicators for signal, clip, and protection status, allowing for easy monitoring and adjustment during operation.

Built with a rugged 2U rackmount chassis, the RMX850a is designed to withstand the rigors of professional use. It incorporates protective features such as DC, short circuit, and thermal overload protection to safeguard both the amplifier and connected speakers. With its balance of power, reliability, and affordability, the QSC RMX850a Amplifier is an ideal choice for sound reinforcement in a wide range of professional audio environments.

QSC RMX850a F.A.Q.

How do I properly connect the QSC RMX850a amplifier to my audio system?

To connect the RMX850a, ensure that your audio source outputs are connected to the amplifier's inputs using balanced XLR or 1/4" TRS cables. Connect your speakers to the amplifier's outputs using the appropriate gauge speaker wire, ensuring correct impedance matching.

What are the common causes of distortion in the RMX850a and how can I fix it?

Distortion can be caused by overloading the input signal, incorrect gain settings, or speaker impedance mismatches. To fix it, reduce the input signal level, adjust the gain control, and ensure your speakers match the amplifier's impedance requirements.

How can I troubleshoot if my QSC RMX850a is not powering on?

First, check the power cable and ensure it's securely connected. Verify that the outlet is working by testing with another device. Check the amplifier's fuse and replace it if necessary. If the problem persists, consult QSC support.

What maintenance is required to keep my RMX850a amplifier in optimal condition?

Regularly clean the fan intake and exhaust vents to prevent dust accumulation. Ensure the unit is operated in a well-ventilated area to avoid overheating. Periodically check all connections for wear or damage.

How do I bridge the channels on the QSC RMX850a amplifier?

To bridge the RMX850a, set the amplifier to bridge mode using the rear panel switch. Connect the positive (+) terminal of your speaker to the red binding post of channel 1 and the negative (-) terminal to the red binding post of channel 2.

What should I do if the RMX850a overheats during use?

Ensure the amplifier has adequate ventilation and that the fan is operational. Remove any obstructions to airflow. If overheating persists, reduce the load by lowering the output level or using speakers with a higher impedance.

Can I use the RMX850a amplifier for both stereo and mono applications?

Yes, the RMX850a can be configured for both stereo and mono applications. Use the mode switch on the rear panel to toggle between stereo, parallel, and bridged mono modes depending on your setup requirements.

Why is there no sound coming out of my speakers when using the RMX850a?

Check all cable connections to ensure they are secure. Verify that the amplifier is powered on and the input source is functioning. Make sure the amplifier’s gain controls are properly set and the speakers are connected to the correct outputs.

How can I reduce the noise floor of my RMX850a amplifier?

Use balanced cables for all connections to minimize interference. Ensure all equipment is properly grounded and avoid running audio cables parallel to power cables. Adjust the gain structure to optimize signal-to-noise ratio.

What is the best way to store the QSC RMX850a when not in use for extended periods?

Store the amplifier in a cool, dry place away from moisture and dust. Cover it to protect from debris, and disconnect all cables to prevent damage. Ensure the storage area is free from excessive vibration or temperature variations.