RDL HR-MP2A Datasheet

HALF-RACK SERIES

Model HR-MP2A
Dual Microphone Preamplifier

 Two Independent Microphone Preamplifiers
 Balanced XLR Microphone Inputs
 Independent Controls for Each Preamplifier
 Front-Panel 20 to 60 dB Gain Control
 Switch-selectable 48 Volt Phantom
 Switch-Selectable 15 dB Input Pad
 Switch-Selectable Polarity Reversal

The HR-MP2A is an RDL HALF-RACK product, featuring an all metal chassis and the advanced circuitry for which RDL products are known. HALF-RACKs may be operated free-standing using
the included feet or may be conveniently rack mounted using available rack-mount adapters.

APPLICATION: The HR-MP2A 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 INPUT PAD switch that 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. A 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-MP2A 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-MP2A to be operated as a stereo preamplifier or as
two separate mono preamplifiers.

Each preamplifier provides two balanced line-level output formats: 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.

The HR-MP2A is constructed in a durable half-rack-width shielded metal enclosure for free-standing use or for mounting in an RDL rack adapter,
available separately.

Wherever a dual-channel half-rack microphone audio preamplifier is needed to provide superior audio clarity, user adjustments, reliability,
compactness and unsurpassed versatility and performance, the HR-MP2A is the ideal choice. Use the HR-MP2A combined with other RDL
RACK-UP, STICK-ON, TX™, or FLAT-PAK™ series products as part of a complete audio/video system.

 Switch-selectable 48 Volt Phantom for Both Preamplifiers
 CLIP Indicators for Peaks 3 dB Below Clipping
 Balanced Line-Level Outputs
 Each Output Allows Balanced or Unbalanced Connection
 Each Preamp Output on ¼” TRS or Detachable Terminal Block
 Separate Summed Output 1 + 2 on Detachable Terminal Block

RDL  659 6th St.  Prescott, AZ., USA 86301  [phone]  FAX [phone]  www.rdlnet.com

HALF-RACK

Model HR-MP2A
Dual Microphone Preamplifier

Installation/Operation

EN55103-1 E1-E5; EN55103-2 E1-E4

Typical Performance reflects product at publication tim e exclusive of
EMC data, if any, supplied with product. Specifications are subject to
change without notice.

MOUNTING

For free-standing operation, use the four provided machine screws to mount the feet to t he bottom of the module as shown, OR
Use the four provided machine screws to secure the module to an optional RDL mount, such as an HR-RA2 Rack Adapter.

TYPICAL PERFORMANCE

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 k balanced
Phantom Power: Switchable (both preamplifiers) 48 V phantom (IEC 61938: 2013)
Input pad (2): 15 dB nominal (1 per preamplifier)
Outputs (5): Each preamplifier (rear-panel): 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  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)
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 source)
<-70 dB (20 Hz to 20 kHz, 60 dB gain, 150 source)
Crosstalk: Below noise floor
Indicators (3): POWER LED (blue), CLIP (2, red)
Power Requirement: 24 Vdc @ 165 mA (190 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

891-3332A

Radio Design Labs Technical Support Centers

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