Instruction Manual for HPA4 with 1.0.X Firmware – REV B Page 3
Contents
Safety Information 2
Fuses 2
AC Input Voltage Range 2
Power Cord 2
Modifications 2
Repairs 2
Front Panel 5
Rear Panel 5
Features 6
Quick Start Guide 7
Main Screen 7
Balance Controls 8
Screen Navigation 9
Display Settings 10
Remote Control 11
Front Panel Controls 12
Connecting Other Audio Components 13
Use Balanced Interfaces When Possible 13
Balanced XLR Signal Levels 13
Selecting Components for Your System 13
Use the 12V Trigger Connections 13
Connecting Benchmark Components 14
Benchmark AHB2 Power Amp 14
Benchmark DAC 14
Basic Features 15
Input Selection 15
Volume Control 15
Balance Adjust 15
MUTE Function 15
-20 dB DIM Function 15
Advanced Features (Settings Screens) 16
Settings Menu Screens 16
DISPLAY Settings 17
INPUT SETUP 19
RENAME INPUT 19
VOLUME SETUP 19
SETTINGS LOCK 19
POWER Settings 20
REMOTE Settings 21
ABOUT Screens 22
SPLASH SCREEN 22
RESET Screens 23
HPA4 System Overview 24
The Ultimate Headphone Amplifier 24
The Ultimate Line Amplifier 24
Relay-Controlled Gain Stages 24
Balance Controls 24
100% Analog Signal Path 24
Fully-Balanced Signal Paths 24
Differential Amplifiers 24
Powerful Headphone Output 25
Dual Headphone Outputs 25
Ultra-Wide Bandwidth 25
Rotary Encoder 25
Convenience Features 25
12V Trigger 26
Auto-On Function 26
Casework 26
Equipment Placement 26
Auto-Ranging Power Supply 26
Audio Line Inputs 27
Balanced XLR Interfaces 27
Unbalanced RCA Interfaces 27
Input Level Matching 27
Audio Line Outputs 27
Unity Gain at 0 dB 27
15.8 dB Offset Balanced vs. Unbalanced 27
Headphone Outputs 28
Driving Two Sets of Headphones 28
Standard 1/4" TRS Connector 28
High Performance XLR4 Connector 28
THX-888 Amplifier 29
Headphone and Hearing Warnings 29
Soft-Start Circuit 29
Protection Circuits 29
Advanced Feature Details 30
PRESET Mode 30
Auto-On Function 30
Bi-directional 12V Trigger 30
Software Version Identification 31
Performance Graphs 32
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