MCM Electronics

Dual Mic / Line Preamplifier By Radio Design Labs (RU-MLA2T) MCM Part #555-18864

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Dual Microphone / Line Preamplifier With Audio Output Transformers

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.

Specifications Top

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.

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.


Features:
  • 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

Specifications:
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
Output Impedance: 150 O 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 outputor -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 Vdc @ 80 mA
Ambient Operating Environment: 0° C to 55° C

Part Numbers
MCM Part #:555-18864
Radio Design Labs Part #:RU-MLA2T
Package Specifications & Dimensions
Weight:2 lbs.
Hazardous:No
RoHS Comp:Yes
Warranty:1095 days
Need to Return?
Length:7 in.
Width:6.25 in.
Height:3 in.
Shipping Information
Extra Shipping Charge:No
Drop Ship:No

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