QSC RMX850a 850a Professional Performance Two Channels Compact Power Amplifier
Product highlights
Product highlights
In the box
In the box
Free standard shipping
Free standard shipping
*Orders placed before 1 PM EST Mon - Thur will ship the same day. Orders placed beyond these hours will be shipped the next business day. Exclusions apply. See shipping policy
Free Local Pickup
Free Local Pickup
Please call for store stock availability. Requests made before 2:30 PM EST can be available for next-day pickup. Learn more
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 clip 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 clip 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.
General
| Configuration | Core |
| AC Input Power | 100, 120, 230 V AC (factory configured), 50–60 Hz |
| Ports | 11 |
Audio
| Impedance | 20k Ohms |
| Tone Adjustment | No |
- 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
- 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
- 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
- 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
- 20 Hz to 20 kHz: +0/-1 dB -3 dB points: 5 Hz and 50 kHz (LF filter bybassed, 8Ω)
- Input: Active balanced; 3-pin Euro-style detachable terminal block and XLR (pin 2+)
- Output: Touch-proof binding posts; Neutrik Speakon
- Front: AC switch; Channel 1 and 2 gain knobs
- Rear: 10-position DIP switch
- Power on: Green
- Signal: Yellow (1 per channel)
- Clip/protect: Red (1 per channel)
- Turn-on/off muting
- AC coupling (850, 1450)
- Triac crowbar (1850HD, 2450, 4050HD, 5050) on each channel
QSC RMX850a 850a Professional, Two Channels Power Amplifier with Input and Output Connectors
| Power per Channel, Stereo Mode (both channels driven) | |
| Power, Bridge-Mono Mode | |
| 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) | |
| Distortion (typical) | |
| Frequency response | |
| 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) | |
| Controls | |
| LED indicators | |
| Amplifier protection | Full short circuit, open circuit, tdermal, ultrasonic, RF protection. Stable into reactive or mismatched loads |
| Load protection | |
| 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 & Returns
Frequently Asked Questions
How do I return an item?
How do I return an item?
Returns are incredibly simple. Please log into your account, find your item you wish to return and follow the prompts to make a return. If you do not have an account, click here to find your order and make a return.
Will I receive a full refund when I return an item?
Will I receive a full refund when I return an item?
You will receive a full refund when you return an item in its original manufacturer’s packaging, undamaged and unmarked. If the item you are returning is priced at less than $35, you will be charged a 15% restocking fee. Please note you will not be refunded any shipping charges.
How many days do I have to make a return?
How many days do I have to make a return?
You have 30 days to make a return. During the holiday season, from November 1 to December 31, we extend the return window to 60 days.
My item was damaged in transit. How do I place a return?
My item was damaged in transit. How do I place a return?
If your order has been noticeably damaged in transit, we strongly recommend that you refuse delivery and notify us immediately. Claims for missing items or items damaged in transit must be made within 48 hours of delivery. If there is carrier damage, please contact support@focuscamera.com with your order number and a description of the damage.
There’s an issue with my order, what should I do?
There’s an issue with my order, what should I do?
Oh no! Please contact our customer service team so we can resolve the issue immediately. You can call us on 1.800.221.0828, email us at support@focuscamera.com, or send us a message here.
Can I exchange an item?
Can I exchange an item?
We do not currently offer exchanges. Please return the item you purchased within 30 days and order what you’d like instead.
If I ordered a kit, do I have to return all the items?
If I ordered a kit, do I have to return all the items?
If you ordered a kit, you must return all components and accessories to receive a full refund.
I ordered a product that included a free item. I’d like to return it, do I need to return the free item as well?
I ordered a product that included a free item. I’d like to return it, do I need to return the free item as well?
If you ordered a product that included a free item, you must include the free item with your return. If not, your return will not be accepted and you will not receive a full refund.
Do you offer repairs?
Do you offer repairs?
We currently only offer camera repairs at our Brooklyn store. The item must be dropped off and collected in person as we do not accept shipped items for repair. For more information, please call our Brooklyn store on 1.718.431.7900.
What is your return policy?
What is your return policy?
Most items can be returned within 30 days for a full refund. Click here to read our full return policy.
