Radio Design Labs RU-MLA2
Dual Mic/Line Preamplifier


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List Price: $352.75
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Radio Design Labs' 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.

NOTE: Radio Design Labs' PS-24AS power supply is NOT included but is required in order to power this product.  Please see the "Accessories" tab or click here for more information on the PS-24AS power supply.

Gain trim for each channel is provided on a front-panel control. The knurled adjustment includes a slot so the gain may be adjusted by hand or by screwdriver. 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.


  • 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


  • 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 kO balanced, switchable 24 V phantom (IEC 1938: 1996-12)
    Line: > 10 kO balanced; may be connected unbalanced
  • Outputs (2): XLR(front); detachable term block(rear)
  • Output level: Switch-selectable (rear panel) MIC/LINE
  • 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
Mounting Bracket for RACK-UP SeriesRadio Design Labs RU-BR1 Mounting Bracket for RACK-UP Series

The RU-BR1 mounts an RDL 'RACK-UP' module above or below a horizontal surface.

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Our Price:$33.16List Price: $39.14You save 15%!

24 VDC 500mA Switching Power SupplyRadio Design Labs PS-24AS 24 VDC 500mA Switching Power Supply

Radio Design Labs' PS-24AS is a 24 Vdc switching power supply with a North American AC plug.  500 mA, dc plug.Specifications: Input: 100 to 240 VACOutput: 24 Vdc, 500 mA (UL, CSA)Dimensions: 1.65" x 2.75" x 1.45" (4.2 x 7 x 3.7 ...

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Our Price:$22.92List Price: $30.67You save 25%!

Single RACK-UP Mounting Bay Utility ChassisRadio Design Labs UC-1 Single RACK-UP Mounting Bay Utility Chassis

Radio Design Labs' UC-1 is an ULTRASTYLE design tabletop chassis for mounting RDL modules and accessories. The front panel features a single RACK-UP mounting bay. The rear panel has an identical mounting bay and is supplied with matching ...

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Our Price:$84.01List Price: $112.37You save 25%!

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