Precision Audio and AV Interface Products

Radio Design Labs

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

  • 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
  • Overview
  • Specifications
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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.

Applications

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
Package Type:
Cardboard Box
Package Dimensions:
6 x 6 x 2.625 in.
Shipping Weight:
1.63 lbs.
WEEE weight:
1.38 lbs.
Tariff code:
8543.70.9860

Documents:
Format
PDF
CAD Files:
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High Res Images:
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Declaration of Conformity:
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RACK-UP SERIES

RACK-UPs are the original 1/3 rack width 1RU rack-mountable modules for the A/V, recording and broadcast industries. Module functions include mixing, switching, pre-amplification, power amplification, distribution, gain control, equalization and more. Some RACK-UP modules are constructed in solid encapsulated durable industrial black plastic enclosures; MAX RACK-UPs are assembled using heavy duty extruded aluminum and steel panels. The rear panels feature clear bold white lettering for the terminal blocks and connectors. Reverse-printed front-panel polycarbonate laminates provide an attractive, durable finished appearance for rack-mounted or free-standing use.

Since RDL first originated 1/3 rack width modules, RACK-UPs have led the industry in economical, high-performance and cost-effective long life solutions in system designs. Multiple RACK-UP modules may be interconnected, or may be connected with other RDL modules to form all or part of an A/V system. Certain RACK-UP modules are often used free standing; all RACK-UPs may be rack mounted. A complete range of mounting options is available for systems comprised of multiple modules.

RACK-UP modules provide input, output and control connections through terminal blocks and connector (or both) according to common usage in professional installations. Front panels are equipped with connectors, user controls and LED metering, as appropriate.

Functions and features provided by RACK-UPs, since their introduction, are still available today. This continuity in product offering and support makes RACK-UP modules a preferred long-term resource for system design solutions. RACK-UP SERIES modules are designed and manufactured in the U.S.A.

RU-MX4 RU-MX4