QSC RMX850a 850a Professional Performance Two Channels Compact Power Amplifier

Open box
RMX850A-120_MINT
Features
  • A professional-quality 2-channel amplifier
  • Features a compact size and delivers up to 430 watts
  • Features high-current toroidal transformers
  • Features independent clip limiter and low-frequency filter
  • Balanced 1/4-inch TRS, XLR, and barrier strip input connectors
  • Touch-proof binding post and Neutrik Speakon output connectors
  • Front-mounted gain controls for easy access
  • Signal and clip LED indicators for monitoring performance
  • Independent DC and thermal overload protection on each channel
  • Stereo, Bridge Mono, and Parallel modes of operation
What's in the Box
  • QSC RMX850a 850a Professional, Two Channels Power Amplifier with Input and Output Connectors
  • Quick Start Guide
  • Adhesive Rubber Feet
  • Rear Rack Ear Mounting Kit
  • IEC-Type Detachable Power Cord
  • Limited 3-Year Warranty
Item Description

The QSC RMX850a Power Amplifier is designed for professional quality performance. The QSC is known for incorporating road-proven designs into its products.

Compact Design

This amplifier is compact in size, delivering up to 430 watts. It is designed with a high-current toroidal transformer, which provides greater 2-ohm power and low noise. It features independent user-defeatable limiters that reduce distortion. It is enriched with selectable low-frequency filters to protect speakers and increase headroom.

Easy Connection

The QSC RMX850a amplifier has balanced 1/4-inch TRS, XLR, and barrier strip inputs, as well as touch-proof binding posts and Neutrik Speakon outputs. Its front-mounted gain controls allow for easy access and adjustment of gain levels.

Control

The amplifiers feature signal and LED indicators for monitoring performance. It has independent DC and thermal overload protection on each channel, which automatically protects the amplifier and speakers from damage.

Specifications

QSC RMX850a 850a Professional, Two Channels Power Amplifier with Input and Output Connectors

  • Power per Channel, Stereo Mode (both channels driven):
    • 8Ω, FTC 20 Hz to 20 kHz, 0.1 percent THD: 185 watt
    • 8Ω, EIA 1 kHz, 0. Percent THD: 200 watt
    • 4Ω, FTC 20 Hz to 20 kHz, 0.1percent THD: 280 watt
    • 4Ω, EIA 1 kHz, 0.1percent THD: 300 watt
    • 2Ω, EIA 1 kHz, 1percent THD: 430 watt
  • Power, Bridge-Mono Mode:
    • 8Ω, FTC 20 Hz–20 kHz, 0.1percent THD: 530 watt
    • 8Ω, EIA 1 kHz, 0.1percent THD: 600 watt
    • 4Ω, EIA 1 kHz, 1percent THD: 830 watt
  • Signal to noise (20 Hz to 20 kHz): -100 dB
  • Distortion (SMPTE-IM): < 0.01percent   
  • Input sensitivity at 8Ω: 1.15V (+3.4dBu)
  • Voltage gain: 31.6x (30 dB)
  • Output circuitry: Class AB
  • Current draw (120 V AC):
    • Typical, 1/8 power pink noise at 4Ω: 4.5 A
    • Severe, 1/3 power pink noise at 4Ω: 6.6 A
    • AC mains plug 100/120V 230V: NEMA 5-15CEE7/7
  • Distortion (typical):
    • 20 Hz to 20 kHz, 10 dB below rated power: < 0.03percent tdD, 4Ω and 8Ω
    • 1 kHz and below, full rated power:  < 0.03percent tdD, 4Ω and 8Ω
  • Frequency response:
    • 20 Hz to 20 kHz: +0/-1 dB -3 dB points: 5 Hz and 50 kHz (LF filter bybassed, 8Ω)
  • Damping factor (1 kHz and below): > 300 at 8Ω
  • Input impedance: 10 kΩ unbalanced; 20 kΩ balanced
  • Input stage clipping: 10 V rms (+22 dBu)
  • Cooling: Continuously variable speed fan, back-to-front airflow
  • Connectors (each channel):
    • Input: Active balanced; 3-pin Euro-style detachable terminal block and XLR (pin 2+)
    • Output: Touch-proof binding posts; Neutrik Speakon
  • Controls:
    • Front: AC switch; Channel 1 and 2 gain knobs
    • Rear: 10-position DIP switch
  • LED indicators:
    • Power on: Green
    • Signal: Yellow (1 per channel)
    • Clip/protect: Red (1 per channel)
  • Amplifier protection: Full short circuit, open circuit, tdermal, ultrasonic, RF protection. Stable into reactive or mismatched loads
  • Load protection               :
    • Turn-on/off muting
    • AC coupling (850, 1450)
    • Triac crowbar (1850HD, 2450, 4050HD, 5050) on each channel
  • Product dimensions (H x W x D): 3.5 (2 RU) x 19 x 15.9-inch
  • Carton dimensions (H x W x D): 24 x 22 x 6-inch
  • Net weight: 35lb
  • Shipping weight: 41lb
  • Power requirements: 100, 120, 230 V AC (factory configured), 50 to 60 Hz

Shipping

Shipping is free within the continental United States (lower 48 states only). Rates include handling and insurance.

Domestic Shipping

Lower 48 States: Free shipping, including handling and insurance.
Alaska, Hawaii, Puerto Rico, U.S. Territories, APO & FPO: Additional shipping charges may apply, and some items cannot be shipped to these locations. Please use the Shipping and Payments tab with your ZIP code to confirm availability and view exact costs. Free shipping applies only to the lower 48 states.

International Shipping

All international orders are processed through eBay’s Global Shipping Program. Please see the Shipping tab for detailed costs and available options.

Restrictions

Orders cannot be shipped to hotel addresses at this time.

Payment

We accept major credit cards and PayPal; however, American Express is not supported on this platform. All payments are securely processed through eBay’s managed payment system. Immediate PayPal payment is required for all Buy It Now purchases, while payments for Best Offers are due within 3 days. If you need special payment arrangements, please contact us via eBay messages.

Please note that payments cannot be modified once an order is submitted or fulfilled, so any issues must be resolved beforehand. For payment-related questions or assistance, contact eBay customer support directly

Returns

We want you to be happy with your purchase. If you're not satisfied, you may return your item within 30 days of delivery. Please contact us via eBay messages or the returns link to obtain an RMA number.

Domestic Purchases

  • If you wish to return an item, please contact us via eBay messages or the returns link to obtain a Returned Merchandise Authorization (RMA) number. This ensures proper handling of your return or replacement.
  • To qualify for a full refund (less shipping expenses), the item must be in its original new condition, with all packaging, manuals, and paperwork intact and unaltered. Opened items are eligible for return but may be subject to a restocking fee.
  • Customers are responsible for the shipping and handling costs incurred in sending the item. If your order included Free Shipping, the shipping expenses we paid on your behalf will be deducted from your refund. If an item is refused, the carrier charges for both ways will be deducted from your refund.
  • All returns are subject to inspection. Items must be in brand new condition as described above. If not, the return may be deemed non-refundable or subject to a restocking fee of at least 15%. Missing accessories or signs of wear may result in higher restocking fees. For specific fee details, please contact us via eBay messages.
  • Returns must be packed in an outer shipping carton (not just the original product box), with the RMA number clearly marked on the shipping label. Include a copy of your invoice and order number, and insure your return shipment with prepaid shipping. We do not accept COD shipments.
  • Certain product categories are not eligible for return due to hygienic or sanitary reasons, as required by manufacturers. Consumable goods or items locked by manufacturers (such as Apple or HP) are not returnable.

Promotional Items

  • If you received a free item as part of a “Buy 1, Get 1 Free” promotion, the free item must be returned with your original return request to receive a full refund. If the free item is not returned, its value will be deducted from your refund amount.

Other Issues

  • For warranty claims, lost merchandise, transit issues, or order cancellations, please contact us via eBay messages. In the event of a price or description error, we will notify you promptly. You will have no obligation to proceed with the purchase, and any amount charged will be fully refunded.

Need camera gear & electronics? Visit Focus Camera!
Discover everyday essentials. Shop Lifestyle by Focus!

Featured Categories
Featured Brands
Powered by Frooition
This listing is currently undergoing maintenance, we apologise for any inconvenience caused.