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RU-MLA2 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
  • RU-MLA2
  • Overview
  • Specifications
  • Related Products
  • Accessories
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  • How to Buy
  • Product Series
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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.

Tech Tips

Versatile Two Channel Mic/Line Preamplifier

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 61938: 2013)
  Line:
> 10 kΩ balanced; may be connected unbalanced
Outputs (2):
XLR(front); detachable term block(rear)
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
Headroom:
> 20 dB (above +4 dBu LINE output)
Ambient Operating Environment:
0° C to 55° C
Power Requirement:
GROUND-REFERENCED, 24 Vdc @ 80 mA
Package Type:
Cardboard Box
Package Dimensions:
6 x 6 x 2.625 in.
Shipping Weight:
1.48 lbs.
WEEE weight:
1.25 lbs.
Tariff code:
8543.70.9860

Documents:
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Declaration of Conformity:
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RACK-UP SERIES

RACK-UPs are the original 1/3 rack width 1RU rack-mountable modules for the A/V, recording and broadcast industries. Module functions include mixing, switching, pre-amplification, power amplification, distribution, gain control, equalization and more. Some RACK-UP modules are constructed in solid encapsulated durable industrial black plastic enclosures; MAX RACK-UPs are assembled using heavy duty extruded aluminum and steel panels. The rear panels feature clear bold white lettering for the terminal blocks and connectors. Reverse-printed front-panel polycarbonate laminates provide an attractive, durable finished appearance for rack-mounted or free-standing use.

Since RDL first originated 1/3 rack width modules, RACK-UPs have led the industry in economical, high-performance and cost-effective long life solutions in system designs. Multiple RACK-UP modules may be interconnected, or may be connected with other RDL modules to form all or part of an A/V system. Certain RACK-UP modules are often used free standing; all RACK-UPs may be rack mounted. A complete range of mounting options is available for systems comprised of multiple modules.

RACK-UP modules provide input, output and control connections through terminal blocks and connector (or both) according to common usage in professional installations. Front panels are equipped with connectors, user controls and LED metering, as appropriate.

Functions and features provided by RACK-UPs, since their introduction, are still available today. This continuity in product offering and support makes RACK-UP modules a preferred long-term resource for system design solutions. RACK-UP SERIES modules are designed and manufactured in the U.S.A.

RU-MLA2 RU-MLA2