Benchmark PRE420 Manuals

Manuals and User Guides for Benchmark PRE420. We have 1 Benchmark PRE420 manual available for free PDF download: Instruction Manual

Benchmark PRE420 Instruction Manual

Benchmark PRE420 Instruction Manual (37 pages)

4-Channel Microphone Preamplifier/Mixer

Brand: Benchmark | Category: Amplifier | Size: 1.4 MB

Table of Contents

Safety Information

2
- Voltage Selection
  2
- Repairs
  2
- Fuses
  2
- Modifications
  2
- Table of Contents
  3
Contents

3
Overview

4
Features

6
Connections

7
- Microphone Inputs
  7
- Balanced Outputs - Overview
  7
- Driving Unbalanced Loads
  8
- Output Signal Levels
  8
- Direct Outputs
  8
- Control Room Outputs (L&R)
  8
- Main Outputs (L&R)
  8
- AC Power Entry Connector
  8
- Fuse Holder
  8
Preamp Section

9
- Preamp Overview
  9
- Input Topology
  9
- Microphone Gain Controls
  9
- Blocking RF, EMI, and Noise
  9
- Phantom Power Switches
  9
- Input Protection
  9
- Mirrorpan™ Pan Controls
  11
- 20 Db Pads
  11
- Terminating Unused Inputs
  11
- 40 Hz High-Pass Filters
  11
- LED Meters - Direct Outputs
  11
Solo Bus

12
- Solo Switches
  12
- Stereo/Mono solo Switch
  12
Control Room Outputs

13
- Control Room Mute Switch
  13
- Driving Unbalanced Loads
  13
- Monitor Fader
  13
HPA2™ Headphone Output

14
- ''0-Ohm'' Output Impedance
  14
  - Headphone Performance
    14
MIX Outputs

15
- Driving Unbalanced Loads
  15
- Main Fader
  15
- LED Meters - MIX Outputs
  15
Rack Mounting

16
- Mounting Near Other Equipment
  16
Performance Graphs

17
- Frequency Response
  17
- High-Pass Filter - Frequency Response
  18
- Inter-Channel Phase Response
  19
- THD+N Vs. Frequency
  20
- Wideband THD+N Vs. Frequency
  21
- Equivalent Input Noise Vs. Gain
  22
- Noise Spectrum
  23
- THD Spectrum at 1 Khz
  24
- THD Spectrum at 10 Khz
  25
Specifications

26
- Microphone Preamps
  26
- Direct Outputs
  27
- Control Room and Main Outputs
  27
- Mirrorpan™ Constant-Power Pan Circuit
  28
- HPA2™ Headphone Amplifier
  28
- LED Status Indicators and Meters
  29
- AC Power Requirements
  29
- Dimensions
  30
- Weight
  30
Regulatory Compliance

31
- FCC Notice
  31
- Rohs Compliant Information
  31
- CE Certificate of Conformity
  32
Warranty Information

33
- Benchmark Extended Warranty
  34
Calibration

35
- Required Equipment
  35
- +48V Adjustment
  35
- Microphone Gain and Metering
  35
- Monitor Gain Balance
  35
- Microphone Pan Balance
  35
- Main Gain Balance
  36
- Peak LED Adjust - Main Outputs
  36

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