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Amplifier
PRE420
Instruction manual
Table Of Contents; Contents - Benchmark PRE420 Instruction Manual
4-channel microphone preamplifier/mixer
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Contents
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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
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Microphone Preamps
8
Direct Outputs
Control Room and Main Outputs
9
MirrorPan™ Constant-Power Pan Circuit
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HPA2™ Headphone Amplifier
9
LED Status Indicators and Meters
9
AC Power Requirements
9
Dimensions
9
Weight
9
Regulatory Compliance
11
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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
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