เพาเวอร์แอมป์ QSC RMX850A Power Amplifier

เครื่องขยายเสียงกลางแจ้ง QSC RMX850A มีกำลังขับ 300 วัตต์ ที่ 4 โอมห์ Stereo mode (both channels driven) 8 Ω FTC 20 to 20,000 Hz at 0.1% THD: 185 W 8 Ω EIA


฿23,000.00 ฿19,550.00



เครื่องขยายเสียง QSC RMX850A 300W 4 Ohms

The 300 watts per channel 4Ω QSC RMX850a Power Amplifier is a 2RU rack mountable amplifier designed for live sound reinforcement applications. The amplifier features two Class AB output channels that can operate in either stereo or mono bridge mode. The unit operates on a standard 15 amp plug and utilizes high-current toroidal transformers for less noise and better performance when pushing a 2 ohm load. To reduce distortion, the amplifier utilizes independent user-defeatable clip limiters and includes LED indicator lights to show the presence of the signal and when the signal is clipping.

The chassis of the amplifier is designed with front to rear cooling vents and includes selectable low-frequency filters at 30 Hz and 50 Hz to protect speakers from bottoming out and improve headroom when driving mid and high frequencies. The front panel of the unit features two gain control knobs for easy access and each channel is protected by a dedicated DC and thermal overload protection circuit. For inputs, the back of the unit accepts both balanced 1/4″ and XLR inputs. For outputs, the unit features both Neutrik Speakon and touch-proof binding post connections.


  • Compact size — up to 2500 watts in two rack spaces, or 5000 watts in three rack spaces
  • High-current toroidal transformers, for greater 2-ohm power and low noise
  • Independent user-defeatable clip limiters reduce distortion
  • Selectable low-frequency filters (30 Hz or 50 Hz) protect speakers and increase headroom
  • The 4000-watt RMX4050a operates on a standard 15 amp plug (120V)
  • Both the RMX4050a and the RMX5050a feature a dual mono, high-current power supply for increased reliability and performance
  • The RMX4050a’s particularly exceptional combination of cooling capacity and electrical efficiency provides robust thermal performance suitable for high continuous power in 2-ohm stereo or 4-ohm bridged applications.
  • Balanced 1/4” (6.3 mm) TRS, XLR, and barrier strip inputs
  • Touch-proof binding post and Neutrik Speakon® outputs
  • Front mounted gain controls for easy access
  • Signal and clip LED indicators for monitoring performance
  • Independent DC and thermal overload protection on each channel automatically protects amplifier and speakers
  • 3-year warranty plus optional 3-year extended service contract


Power Rating Stereo mode (both channels driven)

8 Ω FTC 20 to 20,000 Hz at 0.1% THD: 185 W

8 Ω EIA 1,000 Hz at 0.1% THD: 200 W

4 Ω FTC 20 to 20,000 Hz at 0.1% THD: 280 W

4 Ω EIA 1,000 Hz at 0.1% THD: 300 W

2 Ω EIA 1,000 Hz at 0.1% THD: 430 W


Bridge-mono mode 8 Ω FTC 20 to 20,000 Hz at 0.1% THD: 530 W

Bridge-mono mode 8 Ω EIA 1,000 Hz at 0.1% THD: 600 W

Bridge-mono mode 4 Ω EIA 1,000 Hz at 0.1% THD: 830 W

Signal-to-Noise Ratio > -100 dB
Distortion SMPTE-IM: < 0.01%


For 8 and 4 Ω load

THD for 20 to 20,000 Hz at 10 dB below rated power: less than 0.03%

THD for 1,000 Hz at full rated power: less than 0.03%

Input Sensitivity 1.15 V (+3.4 dBU) at 8 Ω
Voltage Gain 31.6x (30 dB)
Circuit Type Class AB
Power Consumption 4.5 A


1/8 power pink noise at 4Ω 6.6 A

Damping Factor > 300 at 8Ω
Input Impedance 10 kΩ balanced

20 kΩ unbalanced

Frequency Response 20 to 20,000 Hz +0/-1 dB -3 dB points

5 Hz to 50,000 Hz (LF filter bypassed/8 Ω)

Input Connections Active balanced 3-pin Euro-style detachable terminal block

2 x 3-pin XLR

2 x 1/4″ TRS

Cooling Continuously variable speed fan, back-to-front airflow
Output Connectors Touch-proof binding posts

2 x Neutrik Speakon

Controls Front Panel AC switch

Channel 1 gain knob

Channel 2 gain knob

Controls Rear Panel 10-position DIP switch
Indicators Power-on: green LED

Signal: yellow LED (1 per channel)

Clip: red LED (1 per channel)

Protect: red LED (1 per channel)

Power Requirements 100, 120, 230 VAC at 50 to 60 Hz (factory configured)
Protection Amplifier: Full short circuit, open circuit, thermal, ultrasonic, RF protection. Stable into reactive or mismatched loads


Load: Turn-on/off muting/AC coupling (850, 1450)/ Triac Crowbar (1050HD, 2450, 4050HD, 5050) on each channel

Rack Spaces 2
Plug Type 100/120V: NEMA 5-15


230V: CEE7/7

Dimensions (H x W x D) 3.5 x 19.0 x 15.9″ (89.0 x 482 x 404 mm)
Weight 35.0 lb (15.9 kg)
Packaging Info
Package Weight 36.4 lb
Box Dimensions (LxWxH) 24.0 x 22.0 x 6.0″

โทร. : 022031821, 026414744 ext 13, 020423530
สายด่วน : 081-2399040, 084-7696296, 089-6915832

Line : @soundspacethai

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