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Dual Microphone / Line Preamplifier

RU-MLA2 Dual Microphone / Line Preamplifier

Radio Design Labs - Dual Microphone / Line Preamplifier



  • Two‑channel Audio Preamplifier
  • Front Panel XLR Input / Output Jacks
  • Detachable Input / Output Terminal Blocks
  • Switch‑selectable Mic or Line Inputs
  • Switch‑selectable Mic Gain and Phantom
  • Gain Trim on Each Input
  • Each Output Switch‑selectable Mic or Line

The RU‑MLA2 is a dual channel audio preamplifier. The inputs and outputs may be connected through the front‑panel XLR jacks or on the rear panel detachable terminal blocks. Each input accepts either a balanced microphone or line level signal. Each output 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 RU‑MLA2 may be rack‑mounted with the XLR jacks facing forward, or may be reverse‑mounted using the RDL RU‑FP1 Filler Panel/Reverse Mount Kit.

Each audio input is equipped with a rear‑panel switch to select between MIC and LINE level. Two additional switches on each input 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 may be wired balanced or unbalanced. Crosstalk between channels is below the noise floor, allowing the RU‑MLA2 to be operated as a stereo preamplifier or as two separate mono preamplifiers.

Gain trim for each channel is provided on a front‑panel control. An RDL Dual‑led VU meter is provided above each channel gain trimmer. The meters are 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‑MLA2 audio outputs are active balanced. Each output of the RU‑MLA2T is equipped with a studio‑quality audio output transformer.

Radio Design Labs - dcf100mb

Typical Performance:

Inputs (2):

XLR(front); detachable term block(rear)

Input level (for +4 dBu output):

Switch‑selectable (rear panel) MIC/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 kΩ balanced, switchable 24 V phantom (IEC 1938: 1996‑12)

Line:

> 10 kΩ balanced; may be connected unbalanced

Outputs (2):

XLR(front); detachable term block(rear)

Output level:

Switch‑selectable (rear panel) MIC/LINE

Output Impedance:

150 Ω balanced

Channels:

2 (A and B; stereo or dual mono)

Gain Trim (2):

Front panel adjustable; one per channel

Mic:

Off to 52 dB gain (LO GAIN); Off to 69 dB gain (HI 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:

< 0.1% (Mic); < 0.005% (Line)

CMRR:

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

Residual Noise (below +4 dBu LINE output
or ‑45 dBu MIC output):

Mic:

‑79 dB (50 dB Gain); ‑70 dB (Mic 60 dB Gain)

Line:

‑85 dB

Crosstalk:

Below noise floor (A to B; B to A)

Headroom:

> 20 dB (above +4 dBu LINE output)

Power Requirement:

GROUND‑REFERENCED, 24 to 33 Vdc @ 80 mA

Ambient Operating Environment:

0° C to 55° C


Two-channel Audio Preamplifier, Front Panel XLR Input / Output Jacks, Detachable Input / Output Terminal Blocks, Switch-selectable Mic Line Inputs, Switch-selectable Mic Gain Phantom, Gain Trim Input, Each Output Switch-selectable Mic Line, The RU-MLA2 dual channel audio preamplifier inputs outputs connected through front-panel XLR jacks rear panel detachable terminal blocks input accepts either balanced microphone line level signal output provides either microphone line level signal Both front-panel XLR connectors rear-panel terminals active at times RU-MLA2 rack-mounted XLR jacks facing forward, reverse-mounted using RDL RU-FP1 Filler Panel/Reverse Mount Kit, Each audio input equipped rear-panel switch to select between MIC LINE level Two additional switches input allow setting MIC input LO HI gain enabling disabling standard 24 Vdc phantom two microphone gain settings allow connection of wide variety of dynamic condenser microphones output provided separate rear-panel switch to set associated level to either MIC LINE Audio outputs wired balanced unbalanced Crosstalk between channels below noise floor, allowing RU-MLA2 to operated stereo preamplifier two separate mono preamplifiers, Gain trim channel provided front-panel control An RDL Dual-led VU meter provided above channel gain trimmer meters calibrated to indicate +4 dBu outputs set to line level, The rear panel provides detachable terminal block power input jack to connect 24 Vdc power RU-MLA2 audio outputs active balanced output of RU-MLA2T equipped studio-quality audio output transformer, format converter Data/Installation

Mounting Accessories:

19" Rack Mount for 3 RACK-UP Series ProductsRU-RA3
19" Rack Mount for 3 RACK-UP Series Products

19" Rack Mount for 3 RACK-UP Series ProductsRU-RA3A
19" Rack Mount for 3 RACK-UP Series Products

Single Wide Enclosure - RACK-UP MountsUC-1
Single Wide Enclosure - RACK-UP Mounts

Double Wide Enclosure - RACK-UP MountsUC-2
Double Wide Enclosure - RACK-UP Mounts

RACK-UP DIN Rail AdapterDRA-35R
RACK-UP DIN Rail Adapter

RACK-UP Mounting Plate - Mounts any RACK-UP module in a cabinet or other flat surfaceRU-SMA1
RACK-UP Mounting Plate - Mounts any RACK-UP module in a cabinet or other flat surface

Mounting Bracket for RACK-UP SeriesRU-BR1
Mounting Bracket for RACK-UP Series

Related Products:

FP-MP1
Studio Quality Microphone Preamplifier with Phantom - Terminal block & XLR

RU-DA4D
Audio Distribution Amplifier - Balanced - 2x4

STA-1
Dual Balanced/Unbalanced Line Amplifier -12 to 20 dB Gain

STA-2A
Dual High Gain Line Amplifiers

STM-1
Microphone Preamplifier - 50 dB Gain

STM-2
Adjustable Gain Microphone Preamplifier - 35 to 65 dB gain

STM-3
High Gain Microphone Preamplifier - 35 to 75 dB gain

HR-MP2
Dual Microphone Preamplifier

HR-MP2A
Dual Microphone Preamplifier

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Copyright © 2010 Radio Design Labs, Inc. RDL, Radio Design Labs, the RDL logo, STICK-ON, RACK-UP and the Rack-Up logo are registered trademarks of Radio Design Labs, Inc. Flat-Pak, RCX, SourceFlex, SupplyFlex, Sure-Lok, TX, ULTRASTYLE, and Specialists in Practical Precision Engineering are trademarks of Radio Design Labs, Inc. All other trademarks are the property of their respective owners. Typical Performance reflects product at publication time exclusive of EMC data, if any, supplied with product. Date last modified: June 29 2010

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