QSC RMX850A 300W 2-Channel Power Amplifier — main product image

QSC RMX850A 300W 2-Channel Power Amplifier

QSC

QSC RMX850A 300W 2-Channel Power Amplifier

Name: QSC RMX850A 300W 2-Channel Power Amplifier
Brand: QSC
SKU: RMX850A
Rating: 4.3 (50 reviews)

★★★★★4.3 (50 reviews)

4 inch300WXLR

Delivering Professional Sound Quality and Reliability The QSC RMX850a Power Amplifier is engineered to provide exceptional sound quality and reliability for a variety of audio applications. With 300 watts per channel at 4 ohms, this amplifier is suitable for powering small to medium-sized speaker...

$615.99*

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*Price sourced from Amazon.com. Last updated:Jul 21, 2026.Price and availability are subject to change.

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Overview

Delivering Professional Sound Quality and Reliability

The QSC RMX850a Power Amplifier is engineered to provide exceptional sound quality and reliability for a variety of audio applications. With 300 watts per channel at 4 ohms, this amplifier is suitable for powering small to medium-sized speaker systems. Its robust design and user-friendly features make it an ideal choice for live sound reinforcement, DJ setups, and installed sound applications.

Specifications:

Output Power: 300 Watts per channel at 4 Ohms
Inputs: Balanced 1/4 inch TRS, XLR, and barrier strip inputs
Outputs: Speakon and binding post outputs
Features: Independent user-defeatable clip limiters, Selectable low-frequency filters (30 Hz or 50 Hz)

Key Features

Professional quality performance: incorporates road-proven QSC designs

High-current toroidal transformers for greater 2 ohm power and low noise

Independent user-defeat able clip limiters reduce distortion

Selectable low-frequency filters (30 Hz or 50 Hz) protect speakers and increase headroom

Balanced 1/4 inch TRS, XLR, and barrier strip inputs

Specifications

Brand

QSC

Model

RMX850A

Power Output

300W

Channels

2-Channel

Transformer Type

High-current toroidal

Features

Independent user-defeat able clip limiters

Filter Frequencies

30 Hz, 50 Hz

Inputs

Balanced 1/4 inch TRS, XLR, barrier strip

Frequently Asked Questions

What type of transformers does the QSC RMX850A utilize?

The QSC RMX850A incorporates high-current toroidal transformers, which contribute to greater 2 ohm power and reduced noise.

Does this amplifier have features to prevent audio distortion?

Yes, the QSC RMX850A includes independent, user-defeat able clip limiters specifically designed to reduce distortion.

Are there options for protecting connected speakers with this amplifier?

Yes, it features selectable low-frequency filters at either 30 Hz or 50 Hz, which help protect speakers and increase headroom.

What kind of input connections are available on the QSC RMX850A?

The amplifier offers balanced 1/4 inch TRS, XLR, and barrier strip inputs, providing versatile connection options for various audio equipment.

What is the power output of this QSC amplifier?

The QSC RMX850A is a 300W 2-Channel Power Amplifier, delivering a substantial amount of power for audio applications.

What Buyers Say

4.3 ★★★★★50 Amazon ratings

👍 Pros

The QSC RMX850A features high-current toroidal transformers, delivering greater 2 ohm power and maintaining low noise levels.
Independent, user-defeatable clip limiters are incorporated to effectively reduce distortion in audio output.
Selectable low-frequency filters at 30 Hz or 50 Hz protect speakers and increase overall amplifier headroom.
It provides flexible connectivity with balanced 1/4 inch TRS, XLR, and barrier strip inputs for various audio sources.
The amplifier's design incorporates road-proven QSC designs, indicating professional quality performance and reliability.

👎 Cons

The QSC RMX850A is a dedicated power amplifier, meaning it requires a separate preamplifier or mixer for full audio system integration.
While offering 300W, this power output might be insufficient for very large venues or extremely demanding speaker setups.
The specified low-frequency filters are limited to two options, 30 Hz or 50 Hz, which may not suit every specific audio tuning need.
As a professional piece of audio equipment, it might be more complex to set up and configure for casual home users compared to integrated systems.
The product focuses on power amplification and does not include features like digital signal processing or network control often found in modern solutions.