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QSC RMX850 Power Amplifier

by QSC
4.6 out of 5 stars 11 customer reviews

List Price: $429.00
Price: $399.99 & FREE Shipping. Details
You Save: $29.01 (7%)
Only 2 left in stock.
  • Stereo power handling: 200W @ 8 ohms; 300W @ 4 ohms; 430W @ 2 ohms
  • Bridge Mono: 600W @ 8 ohms; 830W @ 4 ohms
  • Independent defeatable clip limiters. Selectable low-frequency filters.
  • Low-noise variable speed fans with rear-to-front air flow keep amplifiers and racks cool.
  • Barrier strip, XLR and 1/4" balanced inputs plus Speakon and binding post outputs.
5 new from $399.99
$399.99 & FREE Shipping. Details Only 2 left in stock. Sold by Front Row Electronics and Fulfilled by Amazon.


Product Description

The RMX Series amplifiers give you clean, dynamic power with the legendary QSC sound quality and reliability that pros depend on. The RMX Series deliver unmatched performance at a new breakthrough price. Muscular Power PlantThe power supply is the heart of an amplifier, converting raw AC power from the wall to clean DC for the audio circuitry. The RMX uses a powerful high-current toroidal transformer and ample filter capacitance to ensure generous energy reserves. This makes a critical difference in sound quality, allowing the amp to effortlessly punch out high level transients, even when driving abusive 2-ohm speaker loads. Superior PerformanceRMX amplifiers deliver true studio-quality sound. A full complementary output circuit using the highest-grade linear output devices delivers ultra-low distortion ( 0.05% THD) a ruler-flat frequency response. SMT (Surface Mount Technology) triples small-signal component density, enabling us to pack up to 2400 watts of power in a chassis only 2 rack spaces less than 16" deep. And unlike other designs, RMX output devices are direct-mounted to the heat sink for optimum thermal coupling cooling. Comprehensive FeaturesThe RMX Series is packed full of professional features that increase performance and flexibility: Independent defeatable clip limiters reduce distortion without sacrificing peak performance. Selectable low-frequency filters boost system response, protect speakers and ensure low-end tightness by more precisely matching the amplifier's range to the loudspeakers. Barrier strip, XLR and 1/4" balanced inputs plus Speakon and binding post outputs provide easy connections. Low-noise variable speed fans with rear-to-front air flow keep amplifiers and racks cool. Proven ReliabilityWith over 30 years of building amplifiers for the largest touring companies and venues around the world, you can count on QSC's reputation for desi

Product Information

Item Weight 38.5 pounds
Product Dimensions 24 x 21.5 x 5.9 inches
Shipping Weight 36 pounds (View shipping rates and policies)
Domestic Shipping This item is also available for shipping to select countries outside the U.S.
International Shipping This item is not eligible for international shipping. Learn More
Origin Made in USA
ASIN B0002FOJXC
Item model number RMX850
Customer Reviews
4.6 out of 5 stars 11 customer reviews

4.6 out of 5 stars
Best Sellers Rank #34,372 in Musical Instruments (See Top 100 in Musical Instruments)
#129 in Musical Instruments > Live Sound & Stage > Power Amplifiers
#12,021 in Musical Instruments > Recording Equipment
Date first available at Amazon.com April 13, 2004

Warranty & Support

Product Warranty: For warranty information about this product, please click here

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Customer Reviews

Top Customer Reviews

Verified Purchase
I've had it powered up for years without a failure. The sound is loud and clear. The input and output connector varieties made it easy to plug in and go. It's affordable. There are a few features (eg, high pass filters, output options) that you'll set and soon forget with DIP switches on the back panel. Instrumentation is minimal. The fan is quiet, but not inaudible in a quiet room. It's heavy.
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I use the 850 in bridge mono mode for my Ampeg 410. I have played out with it for yrs and it NEVER let me down. I played about 60 shows a yr with it.
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Verified Purchase
Worked fine for the football stadium here . Clean , Clear sound with lots of power to spare . Be sure to take note of the impedance you need to use . QSC has other amplifiers that have different impedance outputs . This unit was an 8 ohm only output unit .
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Verified Purchase
.

The amp feels over engineered and heavy duty. It has a high damping factor and low distortion.

I chose it because it is an AB type AMP, which is supposed to have lower distortion over the H class amps.

Running 4 15 inch JBL speakers off it and it has good punch.

This is an excellent amp for home hi fi as well as pro sound - just remember it has a fan that you will be able to hear at low volumes if you are in the same room. For such usage, you should put the amp in a cabinet to muffle the sound. This type of amp can get hot under heavy load so it needs the fan, but unless you are doing pro shows it is unlikely it will even get a bit warm.

Note that if you do use it for home audio, the input connectors are XLR plugs, so if you have RCA or mini jack outputs, you will need a cable that converts those to XLR - which Amazon sells.

Also, do not forget to buy a DBX equalizer, ( DBX is made by Harman, which also makes JBL and Crown ). Makes all the difference.
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Fantastic Amp, I've had my pride and joy the QSC RMX850 since 2001 and its still going strong. I use in mono for Subwoofer, used it in small and med sized venues. The QSC RMX amps look small but are heavy in performance, endurance, and weight. they are heavy as a cinderblock, I keep it at the very bottom rack. Fan is a little noisy but at the bottom rack noise is not a problem.
the only issue I have had over the years is condensation in the volume controls (potentiometers), making a cracking or distortion when raising or lowering the volume. Which always affects where I tune the left volume level with the right volume level. I use electrical contact cleaner.
With the amp in the off or on position, remove the nobs by pulling outwards then spray inside while turning each volume control up and down rapidly several times. That should clear the cracking noise when raising and lowering the volume. My QSC RMX850 is not the most powerful in my rack, but my #1 Amp in the Rack
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This review is going to be easy. I've had this amp for five years. It sounds great. Built like a tank. NEVER had a single problem with it. Very powerful. I'd buy another without hesitation.
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