QSC RMX 850a Power Amplifier

An update to a time-tested QSC design, this RMXa-series power amp pushes 300 watts per channel at 4 ohms, with defeatable clip limiters and LF filters.

$699.99

  • 12 x  
    $58.33
  • 8 x  
    $87.50
  • No Credit Check
    6 x  
    $116.66
  • No Credit Check
    4 x  
    $175.00

QSC RMX 850 Power Amplifier (430 Watts)

No longer available at zZounds
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.

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.

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).

For support or warranty questions, please contact the manufacturer:
Phone: 800-772-2834
Web: http://qsc.com/support

Reviewers gave this product an overall rating of 5 out of 5 stars. (72 ratings)
by a customer from aol.com

"great quality and reliability for a fair price"

Overall: 5 out of 5 stars
(see rating details)
Verified Customer zZounds has verified that this reviewer made a purchase from us.
untill it wears out! meets all our requirements.
Sound
always great- very seldom have to adjust the eq.
Features
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

Musical Style:

50's-60's-70's show band
15 of 15 people (100%) people found this review helpful. Did you?
Thanks for your opinion!