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HR-MP2 Dual Microphone Preamplifier

  • Two Independent Microphone Preamplifiers
  • Balanced XLR Microphone Inputs
  • Independent Controls for Each Preamplifier
  • Switch-Selectable Low-Cut Filter
  • Front-Panel 20 to 60 dB Gain Control
  • Switch-Selectable 24 or 48 Volt Phantom
  • Switch-Selectable 15 dB Input Pad
  • Switch-Selectable Polarity Reversal
  • Dual-LED VU Meter for Each Preamplifier
  • CLIP Indicators for Peaks 3 dB Below Clipping
  • Balanced Line-Level Outputs
  • Each Output Allows Balanced or Unbalanced Connection
  • Each Preamp Output on XLR, ¼” TRS or Detachable Terminal Block
  • Separate Summed Output 1 + 2 on Detachable Terminal Block
  • HR-MP2
  • Overview
  • Specifications
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The HR-MP2 is a dual channel microphone preamplifier with line-level outputs. Each section provides identical rear-panel signal connections and front-panel controls.

Each preamplifier is equipped with a front-panel FILTER switch to enable or disable a 6 dB/octave low-cut filter with a -3 dB cutoff at 80 Hz. Two additional switches on each input select 24 V or 48 V phantom if the master PHANTOM power selector is ON. The INPUT PAD switch allows the operator to attenuate the input signal by 15 dB prior to the preamplifier input stage, increasing the maximum input level from +5 dBu (attenuator out) to greater than +20 dBu. A POLARITY switch provides signal polarity reversal if needed. The GAIN control provides continuous adjustment between 20 dB and 60 dB. An RDL Dual-LED VU meter is provided adjacent to each gain control. The meters are calibrated to indicate +4 dBu at the associated balanced output. A separate CLIP LED flashes if a signal peak is within 3 dB of clipping. The trigger threshold of the CLIP LED is 17 dB above a normal +4 dBu output.

The HR-MP2 offers exceptional input headroom, wide flat frequency response and extremely low noise with very high common-mode signal rejection. Total harmonic distortion and crosstalk are below the noise floor, allowing the HR-MP2 to be operated as a stereo preamplifier or as two separate mono preamplifiers.

Each preamplifier provides three balanced line-level output formats: XLR male, detachable terminal block and ¼” TRS. A separate summing amplifier provides a combined mono output on a line-level detachable terminal block. Balanced outputs may be wired unbalanced. The rear panel also provides a detachable terminal block and a power input jack to connect 24 Vdc power.

Tech Tips

"Deathly Quiet" Broadcast Quality Dual Microphone Preamplifiers

Applications

AUDIO DISTRIBUTION OVER TWISTED PAIR

AUDIO DISTRIBUTION OVER TWISTED PAIR

BROADCAST QUALITY DIGITAL AUDIO DISTRIBUTION

BROADCAST QUALITY DIGITAL AUDIO DISTRIBUTION

Inputs (2):
XLR (3 pin, rear panel,1=GND, 2+, 3-)
Input level (for +4 dBu output):
-56 dBu to 0 dBu (maximum gain without pad, minimum gain with pad)
Maximum Input Level:
>+5 dBu (input pad disabled), +22 dBu (input pad enabled)
Input Impedance:
> 1 kΩ balanced
Phantom power:
Switchable 24 V or 48 V phantom (IEC 61938: 2013)
Input pad (2):
15 dB nominal (1 per preamplifier)
Outputs (7):
Each preamplifier (rear-panel): XLR (3 pin,1=GND, 2+, 3-), detachable terminal block, ¼” TRS
Mono sum (rear-panel): detachable terminal block
Output level:
+4 dBu balanced, -4 dBV unbalanced; +24 dBu maximum balanced
Output Impedance:
150 Ω balanced
Channels:
2 (1 and 2; may be used for stereo or as two separate mono preamplifiers)
Gain Trim (2):
20 dB to 60 dB (front panel adjustable; one for each preamplifier)
Frequency Response:
10 Hz to 70 kHz (± 0.5 dB, FLAT); -3 dB @ 80 Hz (LOW-CUT FILTER enabled)
THD:
Below noise floor
CMRR:
> 80 dB (50 Hz to 5 kHz)
Residual Noise (below +4 dBu output):
<-85 dB (20 Hz to 20 kHz, 40 dB gain, 150 Ω source); <-70 dB (20 Hz to 20 kHz, 60 dB gain, 150 Ω source)
Crosstalk:
Below noise floor
Indicators (7):
POWER LED (blue), Dual-LED VU meter (2, green/red), CLIP (2, red)
Power Requirement:
24 Vdc @ 175 mA (200 mA with phantom), Ground-referenced
Mounting:
Rack-mount using optional rack adapters such as HR-RA2; or operate free-standing (feet included)
Dimensions:
Height: 1.7 in, 4.3 cm; Length: 8.6 in, 20.6 cm; Depth: 4.59 in, 11.66 cm
Package Type:
Cardboard Box
Package Dimensions:
9.5 x 7 x 2.25 in.
Shipping Weight:
2.705 lbs.
WEEE weight:
2.36 lbs.
Tariff code:
8543.70.9860

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HALF RACK

RDL Half-Rack products are studio quality electronic equipment in durable metal enclosures ½ rack width, 1RU in height. This series includes both digital and analog products with front-panel user controls and indicators. Connectors are located on the rear panel. Chassis are finished in black powder coat. The front panels feature a full color reverse-printed polycarbonate laminate surrounded by raised end caps and the product label track. The distinctive appearance of the Half-Rack products complements rack mounting or standalone use.

Available RDL accessories permit one or two Half-Rack products to be mounted in 1 RU. Rack mounting is easy and takes only seconds. The product drops into the rack adapter, slides forward and is secured by tightening four screws. For standalone use, each product is supplied with rubber feet secured by screws.

Attractive styling, superior performance, high quality panel controls and connectors, and durable construction make RDL Half-Rack products a preferred long-term resource for system design solutions. HALF RACK SERIES modules are designed and manufactured in the U.S.A.

HR-MP2 HR-MP2