Instruction manual

DAC1 PRE Instruction Manual Rev I Page 3
Contents
Safety Information 2
Voltage Selection 2
Repairs 2
Fuses 2
Modifications 2
Contents 3
Features 4
Overview 5
DAC1 and DAC1 USB Heritage 5
Applications 5
AdvancedUSB Audio™ Technology 5
Jitter-Immune UltraLock™ 5
HPA2™ Headphone Amplifier 6
High-Current Output Drivers 6
‘Audio-Always’ Design Philosophy 6
Low-Noise Internal Power Supply 6
Phase-Accurate Multi-Track and 5.1 6
Automatic Digital De-Emphasis 6
Quick Start Guide 7
Audio Inputs 7
Volume Control 7
Direct Interfacing to Power Amplifiers 7
Source Selector and On/OFF Switch 7
Input Status Display 7
Automatic Standby/Resume 7
Mute on Headphone Insertion 7
Front Panel 8
Input Status Display 8
Error Indication 8
“Source” and “ON/OFF” Switch 8
Standby Mode 9
HPA2
TM
Headphone Jacks 9
Volume Control 9
Rear Panel 10
Analog Input – RCA Unbalanced 10
Computer Input – USB 10
Digital Input 1 – Optical 11
Digital Inputs 2, 3, and 4 - Coaxial 11
Output Level Switch 12
Balanced XLR Analog Line Outputs 12
Unbalanced RCA Analog Outputs 13
Low-Impedance Passive Pads 13
Calibration Trimmers 14
AC Power-Entry and Fuse Module 14
Internal Settings 15
Removing Top Cover 15
Jumpers 15
Rack Mounting 17
System1™ Universal Rack Adapter 17
Blank Rack Panel 17
Benchmark Technologies 18
HPA2™ Headphone Amplifier 18
UltraLock™ Clock System 18
AdvancedUSB Audio™ Technology 21
Performance Graphs 24
Frequency Response Tests 24
FFT Analysis of Idle Channel Noise 26
Multi-Unit Phase Response 27
THD+N Tests 28
Jitter Tests 33
Input Sensitivity Tests 36
Volume Control Curve 38
Specifications 39
Audio Performance 39
Group Delay (Latency) 40
Analog Audio Inputs 41
Digital Audio Inputs 41
Balanced Analog Outputs 42
Unbalanced Analog Outputs 42
HPA2
TM
Headphone Outputs 43
Status Display 43
AC Power Requirements 44
Dimensions 44
Weight 44
Regulatory Compliance 45
FCC and RoHS Compliance Statements 45
CE Certificates of Conformity 45
CE Certificates of Conformity 46
Warranty Information 48
Benchmark 1 Year Warranty 48
Benchmark Extended Warranty 49