Table Of Contents; Contents - Benchmark PRE420 Instruction Manual

Contents

Safety Information
Voltage Selection
Repairs
Fuses
Modifications
Contents
Overview
Features
Connections
Microphone Inputs (1-4)
Balanced Outputs - Overview
Driving Unbalanced Loads
Output Signal Levels
Direct Outputs (1-4)
Control Room Outputs (L&R)
Main Outputs (L&R)
AC Power Entry Connector
Fuse Holder
Preamp Section
Preamp Overview
Input Topology
Microphone Gain Controls
Blocking RF, EMI, and Noise
Phantom Power Switches
Input Protection
MirrorPan™ Pan Controls
20 dB Pads
Terminating Unused Inputs
40 Hz High-Pass Filters
LED Meters - Direct Outputs
Solo Bus
Solo Switches
Stereo/Mono Solo Switch
Control Room Outputs
Control Room Mute Switch
Driving Unbalanced Loads
Monitor Fader
HPA2™ Headphone Output
"0-Ohm" Output Impedance
Headphone Performance
2 Mix Outputs
2 Driving Unbalanced Loads
2 Main Fader
2 LED Meters - Mix Outputs
2
Rack Mounting
3
Mounting Near Other Equipment
4 Performance Graphs
Frequency Response
6
High-Pass Filter - Frequency Response
Inter-Channel Phase Response
7
THD+N vs. Frequency
7
Wideband THD+N vs. Frequency
7
Equivalent Input Noise vs. Gain
8
Noise Spectrum
8
THD Spectrum at 1 KHz
8
THD Spectrum at 10 KHz
8
Specifications
8
8
Microphone Preamps
8
Direct Outputs
Control Room and Main Outputs
9
MirrorPan™ Constant-Power Pan Circuit 28
9
HPA2™ Headphone Amplifier
9
LED Status Indicators and Meters
9
AC Power Requirements
9
Dimensions
9
Weight
9
Regulatory Compliance
11
11 FCC Notice
11
RoHS Compliant Information
11
CE Certificate of Conformity
11
Warranty Information
12
Benchmark Extended Warranty
12
Calibration
12
Required Equipment
13
+48V Adjustment
13
Microphone Gain and Metering
13
Monitor Gain Balance
13
Microphone Pan Balance
Main Gain Balance
14
Peak LED Adjust - Main Outputs
14
14
15
15
15
15
16
16
17
17
18
19
20
21
22
23
24
25
26
26
27
27
28
29
29
30
30
31
31
31
32
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