RDL RU-MLD4 Manual

RDL Modtager RU-MLD4

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RACK-UP® SERIES

Models RU-MLD4 & RU-MLD4T

Mic/Line Distribution Amp

 Distribution Amplifier with Four Outputs

 Front Panel XLR Input / Output Jacks

 Detachable Input / Output Terminal Blocks

 Switch-selectable Mic or Line Input

 Switch-selectable Mic Gain and Phantom

 Gain-Trim on Input

 Each Output Switch-selectable Mic or Line

The RU-MLD4 is part of the group of RACK-UP products from Radio Design Labs. RACK-UPs feature the advanced circuitry for which RDL

products are known, combined with accessible user-friendly controls and displays. The ultra compact design permits high-density installations,

with three products mounted in a single rack unit. Optional brackets permit mounting a RACK-UP module above, below, or in front of any flat

surface!

APPLICATION: The RU-MLD4 is an audio distribution amplifier with four outputs. The input and all four

outputs may be connected through the front-panel XLR jacks or on the rear panel detachable terminal

blocks. The input accepts either a balanced microphone or line level signal. Each of the four outputs

provides either a microphone or line level signal. Both the front-panel XLR connectors and the rear-panel

terminals are active at all times.

The audio input is equipped with a rear-panel switch to select between MIC and LINE level. Two additional

switches allow setting the MIC input for LO or HI gain and for enabling or disabling standard 24 Vdc

phantom. The two microphone gain settings allow the connection of a wide variety of dynamic and

condenser microphones. Each output is provided with a separate rear-panel switch to set the associated

level to either MIC or LINE. Audio outputs are isolated from each other and may be wired balanced or

unbalanced.

Gain trim is provided on a front-panel control. An RDL Dual-led VU meter is provided above the gain

trimmer. The meter is calibrated to indicate +4 dBu for outputs set to line level.

The rear panel provides a detachable terminal block and a power input jack to connect 24 Vdc power. The

RU-MLD4 audio outputs are active balanced. Each output of the RU-MLD4T is equipped with a

studio-quality audio output transformer.

Wherever 1 in by 4 out connectorized mic and line level audio distribution with gain trim is needed to

provide superior audio clarity, user adjustments, reliability, compactness and unsurpassed versatility, the

RU-MLD4 is the ideal choice. Use the RU-MLD4 combined with other RDL RACK-UP, STICK-ON, TX™,

or FLAT-PAK™ series products as part of a complete audio/video system.

RDL 



 659 6th St. 



 Prescott, AZ., USA 86301





(928) 443-9391





FAX (928) 443-9392





www.rdlnet.com

RACK-UP® SERIES

Model RU-MLD4

Mic/Line Distribution Amp

GAIN

LEVEL

TURN PHANTOM ON FOR CONDENSER, OFF FOR DYNAMIC

SET EACH OUTPUT SWITCH TO MIC OR LINE LEVEL

SET GAIN FOR MIC INPUT

SET INPUT FOR

MIC OR LINE LEVEL

CONNECT 24 VDC POWER TO

TERMINAL BLOCK OR JACK

FOR CORRECT

SET INPUT GAIN

LEVEL ON DUAL-LED

METER

OCCASIONALLY

AND RED FLASHING

LEVEL IS CORRECT

WITH GREEN BRIGHT

CONNECT MIC OR LINE INPUT TO FRONT OR REAR

CONNECT MIC OR LINE OUTPUTS TO FRONT OR REAR

UNBALANCED WIRING

INPUT

OUTPUT

PHMGAIN

RDL

MADE IN U.S.A.

RU-MLD4

24 VDCINPUT

O I

L = LINE

M = MIC

OUTPUT 1OUTPUT 2

OUTPUT 4 OUTPUT 3

L M L M MLL M

MIC/LINE

GAIN

LEVEL

INPUT

MIC/LINE

OUTPUT 1

MIC/LINE

OUTPUT 2

MIC/LINE

OUTPUT 3

MIC/LINE

OUTPUT 4

MLD4 MLD4T

TYPICAL PERFORMANCE

Input: XLR (3 pin, front panel) and detachable terminal block (rear panel)

Input level (for +4 dBu output): Switch-selectable (rear panel) MIC (LO or gain) or HI LINE

Mic: -48 dBu to -3 dBu (LO GAIN); -65 dBu to -20 dBu (HI GAIN)

Line: -15 dBu to +28 dBu

Input Impedance:

Mic: 2 kbalanced, switchable 24 V phantom (IEC 61938: 2013)

Line: > 10 kbalanced; may be connected unbalanced

Outputs (4): XLR (3 pin, front panel) and detachable terminal block (rear panel)

Output level: Switch-selectable (rear panel) MIC (-46 dBu) or LINE (+4 dBu)

Output Impedance: 150  balanced; drives high or low impedance lines

Gain Trim: Front panel adjustable; one for each channel

Mic LO GAIN: Off to 52 dB gain

Mic HI GAIN: Off to 69 dB gain

Line: Off to 20 dB gain

Frequency Response:

Mic: 80 Hz to 50 kHz (+/- 0.75 dB); < 10 dB @ 20 Hz (integral high-pass filter)

Line: 15 Hz to 50 kHz (+/- 0.1 dB)

THD+N:

Mic: < 0.1% (80 Hz to 20 kHz)

Line: < 0.005%

CMRR: > 60 dB (Mic); > 50 dB (Line)

Residual Noise

(below +4 dBu LINE output or -45 dBu MIC output):

Mic 40dB Gain, LO GAIN: -79 dB (20 Hz to 20 kHz)

Mic 50dB Gain, HI GAIN: -79 dB (20 Hz to 20 kHz)

Mic 60dB Gain, HI GAIN: -70 dB (20 Hz to 20 kHz)

Line: -85 dB (20 Hz to 20 kHz)

Headroom (above +4 dBu LINE output): > 20 dB

Power Requirement: 24 Vdc @ 90 mA, Ground-referenced

Declaration of Conformity available from rdlnet.com.

Sole EMC specifications provided on product package.

Specifications are subject to change without notice.

Installation/Operation

891-3225G

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

Produkt Specifikationer

Mærke:	RDL
Kategori:	Modtager
Model:	RU-MLD4

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