Radio Design Labs RU-MX4
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RACK-UP SERIES
®
Model RU-MX4
Pro Audio Mic/Line Mixer
ANYWHERE YOU NEED...
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Four Channel Audio Mixer
XLR Microphone Inputs, Phono Line Inputs
Switchable Phantom for Each Mic Input
Mic or Line XLR Output, Switchable
Unbalanced Line Output and Direct Input
Studio Quality, Low-Noise Performance
Integral Compressor/Limiter, Switchable
Expansion Bussing Capability
Output Isolation Transformer (RU-MX4T)
You Need The RU-MX4(T)!
The RU-MX4 is part of the group of RDL RACK-UP products. The compact design permits high-density installations, with three
products mounted in a single rack unit. The RU-MX4 may be used alone, or mounted using a wide variety of RACK-UP series
options.
APPLICATION: 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. All balanced connections are made through XLR connectors. Unbalanced signals are coupled
through phono jacks.
Each of the four RU-MX4 inputs can accept either a balanced XLR mic or an unbalanced line-level phono input. Each MIC input
accepts either a dynamic or a condenser microphone. A PHANTOM switch is located below each microphone input. These
switches activate the phantom voltage and set the input preamplifier for the optimum gain range for the type of microphone. An
integral high-pass filter rolls off frequencies below 80 Hz.
A separate unbalanced DIRECT input allows an external audio source to be summed directly into the mix amplifier, bypassing the
front-panel input level controls. 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. A power interconnect cable is
supplied with each RU-MX4 allowing the rack mounted mixers to run from a single 24 Vdc power supply.
The RU-MX4 provides one balanced output, switchable for mic or line level. The balanced XLR output and the unbalanced phono
jack output may be used at the same time.
Audio levels are adjustable on the front panel. A convenient label area is provided below each fader knob. A label tab included with
the mixer may be professionally labeled using a commercial lettering machine, or the user may write on the tab. The tabs lock into
a pocket behind the front panel laminate to produce a professionally labeled appearance.
Each input channel is equipped with a front-panel dual-LED VU meter that follows standard VU ballistics. A green LED illuminates
at 15 dB below the optimum input gain, becoming progressively brighter with increasing audio level. The adjacent red LED
illuminates when the input gain exceeds the correct operating level.
The final mix is displayed on an LED string VU meter featuring a visually comfortable arc motion. The outputs may be fed directly
from the final mix, or may be routed through the integral compressor/limiter. A rear-panel switch allows the soft-knee compressor to
be switched in or out. When active, the compressor/limiter begins acting as signals exceed 6 dB below the normal output level,
and maintain an average +4 dBu output level for excessive signal levels up to 20 dB. An optional security cover (RU-MX4SC) is
available to prevent user access to the rear panel switches. The RU-MX4 is electronically balanced. A factory installed output
isolation transformer is available by ordering the RU-MX4T.
Wherever a mixer is needed to provide superior audio clarity, user adjustments, reliability, compactness and unsurpassed
versatility, the RU-MX4 is the ideal choice. Use the RU-RA3HD rack-mount adapter to mount multiple mixers, or to combine related
products (such as audio or video distribution, or audio metering) into a single rack unit!
RDL • 659 N. 6th St. • Prescott, AZ., USA 86301 • (928) 443-9391 • FAX (928) 443-9392 • www.rdlnet.com
RACK-UP SERIES
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®
Installation/Operation
Model RU-MX4
Professional Audio Mic/Line Mixer
CONNECT TO EXPAND
MIXING TO ANOTHER
RU-MX4
SWITCH COMPRESSOR
ON IF DESIRED
DIRECT
INPUTS
LINE
OUTPUTS
INPUTS
4
MIC
PHANTOM
OFF ON
24VDC PWR
RDL
CONNECT LINE LEVEL
TO PHONO JACK
OR MIC TO XLR (EACH INPUT)
DIRECT
ON
COMP/LIM
24V
PWR
EN55103-1 E1-E5; EN55103-2 E1-E4
Typical Performance reflects product at publication time
exclusive of EMC data, if any, supplied with product.
Specifications are subject to change without notice.
LINE
MIC
HI
LO
MIC GAIN
LINE
3
2
MIC
PHANTOM
OFF ON
HI
LO
MIC GAIN
1
MIC
PHANTOM
OFF ON
LINE
HI
LO
MIC GAIN
MIC
PHANTOM
OFF ON
LINE
HI
LO
MIC GAIN
24V
PWR
LINE
CONNECT 24 VDC
SUPPLY CURRENT MUST
BE SUFFICIENT TO POWER
ADDITIONAL MIXERS, IF ANY
SET XLR OUTPUT JACK FOR MIC OR LINE LEVEL TURN PHANTOM ON FOR CONDENSER, OFF FOR DYNAMIC
SELECT HI OR LO GAIN AS APPROPRIATE WITH PHANTOM ON
ADJUST LEVELS FOR LED
ACTIVITY IN THIS RANGE
ADJUST EACH INPUT GAIN
FOR BRIGHTEST GREEN LED
WITH MINIMAL FLASHING
OF THE RED LED
INPUT SWITCH SETTINGS
PHANTOM
OFF ON
20
INPUT LEVEL
40
60
-7
-20 -10
-6
HI
LO
MIC GAIN
80
-3 -2 -1 0
1.5 3
5
8
POWER
10 12
PHANTOM
OFF ON
AUDIO COMPRESSION / LIMITING
1
2
3
4
METERING
IF COMPRESSOR IS TURNED ON, LED
FLASHES WHEN COMPRESSOR IS ACTIVE
TYPICAL PERFORMANCE
Microphone Inputs(4):
Microphone Input Level:
Line Inputs (4):
Line Input Level:
Gain Adjustments (5):
Output Attenuator:
Frequency Response:
Mic:
Line:
THD+N:
Mic:
Line:
Residual Noise (below +4dBu output):
40dB Gain, LO GAIN:
50dB Gain, HI GAIN:
60dB Gain, HI GAIN:
Outputs (2):
Indicators (18):
Power Requirement:
Overall Dimensions:
891-3190F
LEFT POSITION FOR DYNAMIC MICS
(HIGH GAIN)
A
T
T
E
N
N
O
R
M
A
L
OUTPUT
HI
LO
MIC GAIN
PHANTOM
OFF ON
HI
LO
MIC GAIN
CENTER POSITION FOR CONDENSER
MICS WITH LOW LEVEL OUTPUTS
(HIGH GAIN)
RIGHT POSITION FOR CONDENSER
MICS WITH HIGH LEVEL OUTPUTS
(LOW GAIN)
SET TO NORMAL UNLESS
OUTPUT NEEDS TO BE TURNED DOWN
2 kΩ balanced, switchable 24 V phantom (IEC 1938: 1996-12)
-58 to –20 dBu (PHANTOM OFF); -41 to –4 dBu (PHANTOM ON) for +4 dBu output
2 kΩ unbalanced
-25 dBV to +20 dBV for +4 dBu output; -10 dBV nominal
Mic: Off to 62 dB gain (PHANTOM OFF); Off to 62 dB gain (PHANTOM ON HI GAIN);
Off to 46 dB gain (PHANTOM ON LO GAIN)
Line: Off to 27 dB gain
0 dB to infinity
80 Hz to 30 kHz (+/- 1.5 dB), <-10 dB @ 20 Hz (integral high-pass filter)
20 Hz to 30 kHz (+/- 0.25 dB)
< 0.1% (80 Hz to 20 kHz)
< 0.02%
4 line level sources (unity gain): < -82 dB (wideband)
Mic: -79 dB; all 4 mic level sources: < -73 dB (wideband); < -76 dB (“A” weighted)
Mic: -79 dB; all 4 mic level sources: < -73 dB (wideband); < -76 dB (“A” weighted)
Mic: -70 dB; all 4 mic level sources: < -64 dB (wideband); < -66 dB (“A” weighted)
+4 dBu 150 Ω balanced (switchable MIC or LINE); -10 dBV unbalanced
Dual-LED VU meter for each input
COMPRESSION/LIMITING active LED
POWER LED
8-segment bar mode string LED audio mix level meter, 0 dB = +4 dBu
VU ballistic: -20 dB, -10 dB, -6 dB, -2 dB, 0 dB, +3 dB; Peak reading: +8 dB,+12 dB
24 Vdc @ 150 mA, Ground-referenced
Height:
1.7 in.
4.3 cm
Length:
5.8 in.
15.0 cm
Depth:
4.8 in.
12.2 cm
Radio Design Labs Technical Support Centers
U.S.A. (800) 933-1780, (928) 778-3554; Fax: (928) 778-3506
Europe [NH Amsterdam] (++31) 20-6238 983; Fax: (++31) 20-6225-287
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