Overview
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.
Features:
- 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
Specifications
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)
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.
Tariff code:
8543.70.9960
RDL Three-Year Limited Warranty
Installation of these products by the Purchaser shall constitute Purchaser’s acknowledgement and acceptance of the terms and
conditions for sale and of this warranty, and shall constitute the Purchaser’s determination of the suitability of this product for the
Purchaser’s intended application. Radio Design Labs, Inc., also referred to as RDL®, warrants to the Purchaser that products
manufactured by RDL are free from defects in material and workmanship. This warranty applies to the period of three years from the date
of shipment, except for component parts or products purchased from other sources and supplied by RDL. Such component parts or
products bear only the warranty of the manufacturer thereof in effect at the time of shipment to the Purchaser. RDL will, without charge,
and after written notice has been received and acknowledged by RDL, repair an RDL product if proved to be defective according to the
usage of the trade, when such equipment is received by RDL at the location it designates with shipment costs prepaid by the Purchaser.
RDL shall not be liable for any expense whether for repairs, replacements, material, service, or otherwise, incurred by the Purchaser or
modifications made by the Purchaser to the product. No equipment shall be deemed defective if it shall fail to operate in a normal or
proper manner due to exposure to excessive moisture in the atmosphere, excessive temperature extremes, improper environmental
cleanliness, or any other environment not consistent with the principles of good engineering practice. In no event shall RDL have any
liability for consequential damage or expense directly or indirectly arising from the use of the products, or any inability to use it either
separately or in combination with other equipment or materials, or from any other cause, whether used in accordance with instructions or
not. This warranty is void if equipment is altered in any way by other than RDL. RDL products are NOT intended for use in life support
appliances, devices, or systems. Use of RDL products in such applications is done solely at the liability of the reseller/installer and/or end
user. RDL reserves the right to change design parameters and specifications at any time without notice. The performance measurements
reflect the products at the time of printing. This warranty is in lieu of all others, either expressed or implied. No representative is authorized
to assume for RDL any other liability in connection with RDL products.
