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QSC RMX 850a Power Amplifier
QSC RMX 850a Power Amplifier
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The QSC RMX 850a Power Amplifier provides professional sound quality and reliability for small systems.... Learn more...
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QSC RMX 850 Power Amplifier (430 Watts)

Part of QSC's long-running, massively popular RMX series of power amps, the RMX 850 deals out 200 watts per channel at 8 ohms; 830 watts at 4 ohms bridged. (82) Read 4 reviews for this product | Rate and Review This Product
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Product Description

QSC's RMX Series amplifiers give you clean, dynamic power with the legendary QSC sound quality and reliability that pros depend on. The RMX Series amps deliver unmatched performance at a breakthrough price.

Muscular Power Plant

The 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 Performance

RMX 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) and a ruler-flat frequency response. SMT (Surface Mount Technology) triples small-signal component density, enabling them to pack up to 2400 watts of power in a chassis only 2 rack spaces and less than 16 in. deep. And, unlike other designs, RMX output devices are direct-mounted to the heat sink for optimum thermal coupling and cooling.

Proven Reliability

With over 30 years of building amplifiers for the largest touring companies and venues around the world, you can count on QSC's reputation for designing the most reliable amps available.

Features:

- 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 in. 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. zZounds is an authorized dealer of QSC products.
Continuous Output Wattage:
8 ohms: 200W
4 ohms: 300W
2 ohms: 430W
8 ohms Bridge Mono: 600W
4 ohms Bridge Mono: 830W

Signal to Noise (20 Hz-20 kHz): 100 dB

Distortion (SMPTE-IM): Less than 0.01%

Input Sensitivity @ 8 ohms: 1.15v (+3.4 dBu)

Voltage Gain: 31.6x (30 dB)

Output Circuitry: AB

Current Consumption (1/8 power pink noise at 4 ohms @ 120VAC,

both channels driven; multiply current by .5 for 230V units.): 5A

Weight (Net): 35 lbs. (15.9 kg)

Distortion (typical):
20 Hz-20 kHz: 10 dB below rated power: Less than 0.03% THD 4 and 8 ohms
1.0 kHz and below: full rated power: Less than 0.03% THD 4 and 8 ohms

Frequency Response:
20 Hz-20 kHz, 0/-1 dB, -3 dB points: 5 Hz-50 kHz
Damping Factor (1 kHz and below): Greater than 300 at 8 ohms

Input Impedance: 10 K ohms unbalanced, 20 K ohms balanced

Input Clipping: 10 Vrms (+22dBu)

Cooling: Continuously variable speed fan, rear-to-front air flow

Connectors (each channel):

Input: Active balanced; barrier strip, XLR, and 1/4 in. (6.3 mm)
TRS tip and XLR pin 2 positive

Output: "Touch-proof" binding posts and Neutrik Speakon

Controls:
Front: AC switch, Ch. 1, and Ch. 2 gain knobs
Rear: 10-position DIP switch

Indicators:
PWR-ON: Green LED SIGNAL: Yellow LED (1 per channel)
CLIP: Red LED (1 per channel)
Amplifier Protection: Full short circuit, open circuit, thermal, ultrasonic, and RF protection. Stable into reactive or mismatched loads.

Load Protection: Turn-on/off muting, AC coupling (850, 1450), triac crowbar (2450, on each channel)

Dimensions:
19 in. (48.3 cm) rack mounting, 3.5 in. (8.9 cm) tall (2 rack spaces),
15.9 in. (40 cm) deep (rack mounting to rear support ears)

Power Requirements: 100, 120, 230 VAC, 50-60 Hz

Note: Register your new product online with QSC and receive a Free 6-Year Extended Warranty upgrade (a $99 value).
QSC Warranty If you have additional warranty questions, please contact the manufacturer at 800-772-2834
Our extended 45-Day 100% Satisfaction Guarantee applies on this product. Buy it, and if it isn't just right for you, return it!
What Our Customers Are Saying About zZounds “zZounds is a great place to purchase musical instruments and gear. They have made online shopping a very easy and smooth experience. I recommend zZounds to anyone shopping for musical instruments." - customer on February 15, 2014
Customer Reviews
4.5 out of 5 (82 ratings) Rate and Review This Product
zZounds has verified that this customer bought this product from us. "Reliable power amplifier with good, clean sound."
Sound: Currently using it in a home studio. Frequency response is good and it produces a nice, clean sound to my studio monitor speakers. Feature: Most useful: connectivity; front exhausting cooling fans; configuration capabilities. Nice having a front-mounted power switch. Ease of Use: Using it is as easy as it comes. Turn it on and it works - reliably. The only learning curve would be in the initial configuration as regards determining the type of cables/connectors and the appropriate dipswitch settngs for the particular application. Quality: Built like a tank. A bit on the heavy side, but I would expect it to last many years. Value: Yes. It's a quality amplifier from a quality company. Manufacturer Support: Have installed many of these amplifiers when working for a video systems integrator and haven't really had any problems that required calling the service department. The Wow Factor: Was using lesser cost alternatives until I could afford to upgrade. There has been a noticeable improvement in the quality of the sound since incorporating it into my home studio. Overall: Always have had good success with many different QSC products. I would expect it to keep working for a long time and should it need replacing for whatever reason, I would buy from them again. For my particular application, the only negatives I have found are a) the weight, although this could also be considered a positive from the standpoint of reliability; and b) the fans are a bit noisy if mounted directly in the mixing space.
Style of Music: Combination of jazz, rock, new age, environmental, movie underscore
6 of 6 people (100%) found this review helpful. Did you?
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zZounds has verified that this customer bought this product from us. "great quality and reliability for a fair price"
Sound: always great- very seldom have to adjust the eq. Feature: turn it on and forget about it! Quality: we play 150 one night jobs a year-never had a problem-have the same units for backup (8 total amps) only use them on monitors. They stay loaded in our truck all year round and are subjected to extreme heat and cold. Value: yes Manufacturer Support: no problems The Wow Factor: practical and affordable Overall: untill it wears out! meets all our requirements.
Style of Music: 50's-60's-70's show band
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Need it now but short of cash? All we need is the first payment up front and the rest in easy monthly payments!

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We approve everyone, with very few exceptions, as long as we can verify your identity.
No interest. Ever.
It's just as if you paid the whole amount up front!
No paperwork. Nothing to track.
No application to mail or fax, no bills to pay. We automatically charge the payments to your credit card.

We'll wait on your money so you don't have to wait for your gear!

When you checkout, just click the Play as you Pay checkbox to indicate which installment plan you wish to use.

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on most orders $49+

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