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    QSC RMX 850 Power Amplifier, 430 Watts

    The RMX 850 features independent, switchable clip limiters to alleviate distortion without sacrificing performance.

    This product has been discontinued or is no longer sold by SameDayMusic.

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    Product Rated 7.9 Out of 10 (33 ratings)

    QSC RMX850 Power Amplifier (430 Watts) 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.


    - 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.

    Same Day Music is an authorized dealer of QSC products.

    QSC RMX 850 Technical Description

    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

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

    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)

    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).

    Same Day Music is an authorized dealer of QSC products.

    QSC RMX850 Power Amplifier (430 Watts) Catalog Description

    Reliable, clean, dynamic QSC power@Flat frequency response and super-low distortion@Defeatable clip limiters on each channel; switchable low-cut filter@Variable-speed fans with rear-to-front air flow@200 watts per side at 8 ohms; 830 watts bridged mono@Barrier strip, XLR, and 1/4" inputs; Speakon and binding post outputs

    Same Day Music is an authorized dealer of QSC products.

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