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Used QSC RMX / RMXa Series
Amplifiers
from
$2,376
median $5,139 · up to $5,939
3 available now
· 3 dealer · 0 in 10K stock
Used QSC RMX / RMXa Series amplifiers are professional two-channel power amplifiers delivering up to 5000 watts in as little as three rack spaces, built around high-current toroidal transformers for reliable, low-noise performance. Both series share road-proven QSC designs with selectable low-frequency filters, independent clip limiters and multiple input options. Scroll down to browse second-hand QSC RMX and RMXa listings currently available.
Used – Brand New Dealer
QSC RMX 5050a
$5,939
View listing →
Used – Brand New Dealer
QSC RMX 4050a
$5,139
View listing →
Used – Brand New Dealer
QSC RMX 1450a
$2,376
View listing →
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QSC RMX / RMXa Series specifications
| Brand | QSC |
| Segment | Audio |
| Typical used price | $5,139 (range $2,376–$5,939) |
About the QSC RMX / RMXa Series
The QSC RMX / RMXa Series encompasses a range of professional power amplifiers spanning models such as the RMX850, RMX1450, RMX1850HD, RMX2450, RMX4050HD and RMX5050 in the RMX line, and the RMX850a through RMX5050a in the RMXa line. The RMX Series offers four two-rackspace models ranging from 430 to 1200 watts per channel at 2 ohms, while larger HD models extend output to 4000 or 5000 watts. Both series feature high-current toroidal transformers, selectable low-frequency filters at 30 Hz or 50 Hz, independent user-defeatable clip limiters, and balanced XLR, quarter-inch TRS and barrier strip inputs. Outputs include touch-proof binding posts and Neutrik Speakon connectors. Front-mounted gain controls, signal and clip LED indicators, and independent DC and thermal overload protection on each channel round out the feature set.
QSC RMX / RMXa Series — buyer FAQs
What are the QSC RMX and RMXa Series amplifiers designed to do?
The QSC RMX and RMXa Series are professional two-channel power amplifiers built for demanding audio applications. Both series use high-current toroidal transformers and offer selectable low-frequency filters at 30 Hz or 50 Hz to protect speakers and increase headroom. Independent clip limiters, DC and thermal overload protection per channel, and multiple input types make them suited to professional installation and live sound reinforcement.
How much power do the RMX and RMXa Series models deliver, and how many rack spaces do they require?
The RMX Series includes two-rackspace models ranging from 430 to 1200 watts per channel at 2 ohms. Larger models extend this considerably: the RMX4050HD delivers 4000 watts and operates on a standard 15-amp plug at 120V, while the top models reach 5000 watts in three rack spaces. The RMXa Series matches this footprint, with up to 2500 watts in two rack spaces or 5000 watts in three.
What input and output connections do the QSC RMX Series amplifiers provide?
RMX Series amplifiers accept balanced XLR, quarter-inch TRS and barrier strip inputs. On the output side they feature touch-proof binding posts and Neutrik Speakon connectors. Front-mounted gain controls and signal and clip LED indicators are included on both the RMX and RMXa lines for straightforward level monitoring and adjustment during use.
Who makes the QSC RMX / RMXa Series and where does it fit in the brand's output?
QSC is an American audio, video and control manufacturer founded in 1968 and headquartered in Costa Mesa, California, known across professional audio for power amplifiers, loudspeakers and the Q-SYS networked platform. The RMX and RMXa Series sit within QSC's professional power amplifier range, applying road-proven QSC designs across multiple output classes from compact two-rackspace units up to high-current HD models intended for more demanding continuous-power applications.
What should a buyer check when purchasing a used QSC RMX or RMXa Series amplifier?
Check which specific model is being sold, since output ratings, rack-unit size and features such as the HD dual-mono power supply vary significantly across the range. Confirm the condition of Speakon and binding-post outputs, that all channel indicators function, and whether any accessories are included. Used listings on this page carry a 21-day warranty covering major functional faults; full purchasing detail is in the buying guide at 10kused.com/used-av-equipment-guide/.
