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
| 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. Up to 3 RU‑MX4 mixers may be rack mounted in a single rack unit using an RDL RU‑RA3HD rack adapter. 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. | | Typical Performance: | Microphone Inputs (4): | 2 kΩ balanced, switchable 24 V phantom (IEC 1938: 1996‑12) | 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 | Balanced Output Coupling: | Elec. bal. (RU‑MX4) or 600 ΩTransformer (RU‑MX4T) | 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 | Power Requirement: | GROUND‑REFERENCED, 24 Vdc @ 150 mA | Ambient Operating Environment: | 0° C to 50° C |
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