DISC Benchmark PRE420 4-Channel Mic Preamplifier

2,946.00 RRP 3,273.00 (including VAT @ 23%)

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  • 4-Channel Microphone Preamplifier
  • Integrated Stereo Mix Bus + Stereo/Mono Solo Bus
  • MirrorPan Constant-Power Pan Circuit
  • RF-Immune, Wide-Bandwidth Design
  • 4 Microphone Inputs with Phantom Power

DISC Benchmark PRE420 4-Channel Mic Preamplifier

Details
The Benchmark PRE 420 four-channel microphone preamplifier boasts an integrated stereo mix bus and stereo/mono solo bus in a sleek, 1RU chassis. It offers maximum transparency, wide bandwidth, low noise, low distortion and excellent RF immunity, making it suitable for the most demanding studio and live applications.

Product Ref: 39501

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Full Description

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Innovative Circuitry That Gives Ultra-Low Distortion

The PRE420 offers the lowest intermodulation distortion available, with innovative circuitry that gives ultra-low distortion and RF-immunity even in the most demanding environments. The wide bandwidth of 500kHz creates a significant demand for exceptional RF filtering and shielding, which is fulfilled by Benchmark with innovative shielding and filtering techniques, including a special construction technique on the circuit board that creates a 3-dimensional shield to surround all signal traces.

Independent Direct XLR Output

The solo section allows monitoring of any channel or combination of channels via the control room XLR outputs and the integrated HPA2™ headphone amplifier. Monitoring of the main mix bus XLR outputs is via a dual, variable intensity signal level meter and peak-warning indicator. Each channel has an independent direct XLR output, a variable intensity signal level meter and peak-warning indicator, and MirrorPan™ pan control.

Excellent Channel Separation and Accurate Imaging

MirrorPan™ boasts innovative mirrored-circuitry that eliminates the non-linear distortion from potentiometer wiper-current. This gives excellent channel separation and accurate imaging. The factory-calibrated centre-detent position ensures precise centre-placement.

Features

  • Stereo mix bus & isolated stereo/mono solo bus
  • MirrorPan™ - low-noise constant-power pan controls
  • 4 direct XLR outputs
  • 2 control room XLR outputs
  • 2 stereo mix XLR outputs
  • HPA2™ - high-current, 0-Ohm headphone power amplifier
  • Adjustable peak warning indicators
  • Variable intensity signal level meter on each channel
  • Variable intensity signal level meter on mix bus
  • Independently switchable +48 V phantom power
  • 40 Hz switchable high-pass filters
  • 20 dB pads

Specifications

Microphone Preamps:

  • Number of Preamps: 4
  • Connectors: Gold-Pin Neutrik™ Female XLR with Direct Ground Feature
  • Grounding: Direct Bonding of Pin 1 to Chassis
  • Input Impedance (with Pad Off): 8.1k Ohms
  • Input Impedance (with Pad On): 1.37k Ohms
  • Gain Range (with Pad Off): 22dB to 60dB (to Direct Outputs)
  • Gain Range (with Pad On): 2dB to 40dB (to Direct Outputs)
  • Phantom Power: +48V with Individual Switches
  • High-Pass (Rumble Filter): 40Hz Second-Order 12dB/Octave
  • RF Protection: CMF1™ Common-Mode Choke
  • Preamp Bandwidth:
    • -0.02dB at 10Hz
    • -0.17dB at 200kHz
    • -3dB at 500kHz

Direct Outputs:

  • Number of Outputs: 4
  • Connectors: Gold-Pin Neutrik™ Male XLR with Direct Ground Feature
  • Output Impedance: 60 Ohms Balanced, 30 Ohms Unbalanced (Pin 3 Floating)
  • Maximum Output Level without Clipping: +29.5dBu
  • Drive Capability at Rated THD+N: 300 Ohms
  • Output Type: Transformerless Voltage and Impedance Balanced

Control Room and Main Outputs:

  • Number of Outputs: 4 Total, 2 Control Room, 2 Main
  • Connectors: Gold-Pin Neutrik™ Male XLR with Direct Ground Feature
  • Output Impedance: 60 Ohms Balanced, 30 Ohms Unbalanced (Pin 3 Floating)
  • Maximum Output Level without Clipping: +29.5dBu
  • Monitor Gain Control L/R Balance: +/- 0.01dB at Full Clockwise Rotation, +/- 0.3dB at Middle of Rotation
  • Drive Capability at Rated THD+N: 300 Ohms
  • Output Type: Transformerless Voltage and Impedance Balanced

MirrorPan™ Constant-Power Pan Circuit:

  • Number of Pan Controls: 4
  • Pan Law: 3-dB (Constant Power to Stereo Out)
  • Deviation from Constant Power: +/- 0.25dB
  • Channel Separation when Fully Panned: >71dB
  • Balance at Centre Detent: +/- 0.25dB
  • THD+N: Better than -112dB, 0.00024

HPA2™ Headphone Amplifier:

  • Number of Outputs: 1
  • Connector: 1/4" TRS with Switch Contacts
  • Output Impedance: 0.11 Ohms, 10Hz to 200kHz
  • Maximum Output Level at 0.001 THD+N: +23.5dBu into 600 Ohms (0.24W), +19.5dBu into 30 Ohms (1.78W)
  • Maximum Output Current: 250mA
  • Overload Protection (Independent per Channel): Current Limited at 300mA, Thermal Shutdown
  • Bandwidth: >500kHz, -0.014dB at 10Hz, -0.013dB at 200kHz
  • THD+N: -106dB, 0.0005 into 30 Ohms at +18dBu (1.26W)

LED Status Indicators and Meters:

  • +48V Phantom Indicators: 4
  • Solo Warning Indicator: 1
  • Power Indicator: 1 Blue
  • Meter Indicators: 6 Dual LED Meters
  • Meter Locations: 4 Microphone Inputs, 2 Main Outputs

Your order may be delivered with a plug adapter
If any electrical items in your order are supplied with a United Kingdom plug connection, a suitable plug conversion adapter will be included free of charge.