RDL RU-MX4 Professional 4 Channel Microphone/Line Mixer with Phantom Power - Microphone and line output

The RU-MX4 is the ideal choice in many applications where a combination of balanced mic and/or unbalanced line-level signals needs to be mixed. Balanced connections use XLR connectors. Unbalanced signals are coupled through phono jacks. Each of the four inputs can accept either a balanced XLR mic or an unbalanced line-level input. 24 V phantom is individually switch selectable for each mic input. The unbalanced phono jack LINE OUTPUT from one RU-MX4 may connect to the unbalanced input of other equipment, or may be connected to the DIRECT input of another RU-MX4 to expand mixing capabilities. The RU-MX4 provides one balanced output, switchable for mic or line level. Audio levels are adjustable on the front panel. Each input channel is equipped with a front-panel dual-LED VU meter that follows standard VU ballistics. The final mix is displayed on an LED string VU meter featuring a visually comfortable arc motion. A rear-panel switch allows the soft-knee compressor to be switched in or out. A factory installed output isolation transformer is available by ordering the RU-MX4T.

RU-MX4 Features:

  • Four Channel Audio Mixer with Expansion Capability
  • XLR Microphone Inputs, Phono Jack Line Inputs
  • Switchable 24 V Phantom for Each Mic Input
  • Mic or Line XLR Output, Switchable
  • Unbalanced Line Output and Direct Input
  • Integral Compressor/Limiter, Switchable
  • Studio-Quality, Low-Noise Performance

Microphone Inputs (4):2 kΩ balanced, switchable 24 V phantom (IEC 61938: 2013)
Mic Input Level for +4 dBu output:-58 to −20 dBu (PHANTOM OFF or ONHI gain); -41 to −4 dBu (PHANTOM ON LO gain)
Line Inputs (4):2 kΩ unbalanced
Line Input Level for +4 dBu out:-25 dBV to +20 dBV, -10 dBV nominal
Gain Adjustments (5):Mic: Off to 62 dB gain (PHANTOM OFF ONHI gain);
Off to 46 dB gain (PHANTOM ON LO gain);
Line: Off to 27 dB gain
Output Attenuator:0 dB to infinity
Frequency Response:Mic: 80 Hz to 30 kHz (± 1.5 dB),
<-10 dB @ 20 Hz (integral high-pass filter)
Line: 20 Hz to 30 kHz (± 0.25 dB)
THD+N:Mic: < 0.1% (80 Hz to 20 kHz)
Line: < 0.02%

Residual Noise (wideband, below +4 dBu output):
Unity Gain:< -84 dB (4 Line level sources)
40dB Gain, Phantom on:Mic: -79 dB; < -73 dB (All 4 mic level sources)
50dB Gain:Mic: -79 dB; < -73 dB (All 4 mic level sources)
60dB Gain:Mic: -70 dB; < -64 dB (All 4 mic level sources)
Outputs (2):+4 dBu 150 Ω bal. (switchable to MIC level -45 dBu);
-10 dBV unbalanced
Indicators (18):Dual-LED VU meter for each input;
COMP/LIMIT active LED; POWER LED; LED audio mix meter,
0 dB = +4 dBu
VU (dB): -20, -10, -6, -2, 0, +3; Peak Reading (dB): +8,+12
Ambient Operating Environment:0° C to 50° C
Power Requirement:GROUND-REFERENCED, 24 Vdc @ 150 mA