- 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
- 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
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. | 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 (both preamplifiers) 48 V phantom (IEC 1938: 1996-12) | | 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 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) | | 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 (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 |
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