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Description:

Manufacturer's website

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 PerformanceThe 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

Microphone Inputs (4):		2 Kohm balanced, switchable 24 V phantom (IEC 1938: 1996-12)
Mic Input Level for +4 dBu output:		-58 to –20 dBu (PHANTOM OFF or ON HI gain); -41 to –4 dBu (PHANTOM ON LO gain)
Line Inputs (4):		2 Kohm 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 at 20 Hz (integral high-pass filter) Line: 20 Hz to 30 kHz (+/- 0.25 dB)
THD+N:		Mic: 0.1 percent (80 Hz to 20 kHz) Line: 0.02 percent
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 ohm bal. (switchable to MIC level -45 dBu); -10 dBV unbalanced
Balanced Output Coupling:		Elec. bal. (RU-MX4) or 600 ohm Transformer (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 at  150 mA
Ambient Operating Environment:		0 degree C to 50 degrees C