DAC1 USB
Instruction Manual Revision D Page 4
Contents
Safety Information 2
Voltage Selection 2
Repairs 2
Fuses 2
Modifications 2
Faceplate Options 3
Contents 4
Features 5
Overview 6
DAC1 Heritage 6
Applications 6
Digital Inputs 6
Advanced USB Audio Technology 6
Jitter-Immune UltraLock™ 7
HPA2™ Headphone Amplifier 7
Mute Function 7
Volume Control 7
Direct Interfacing to Power Amplifiers 7
High-Current Output Drivers 7
‘Audio-Always’ Design Philosophy 7
Error Display 8
Automatic Standby/Resume 8
Low-Noise Internal Power Supply 8
Phase-Accurate Multi-Track and 5.1 8
Automatic Digital De-Emphasis 8
Front Panel 9
Input Status Display 9
Input Selector Switch 9
Input Indication 9
Error Indication 9
Standby Mode 10
HPA2
TM
Stereo Headphone Jacks 10
Volume Control 10
Rear Panel 11
Input 1 - SPDIF/AES BNC 11
Input 2 – AES/EBU XLR 12
Input 3 – Optical 12
Input 4 – USB 12
Output Level Switch 13
Balanced XLR Analog Line Outputs 13
Unbalanced RCA Analog Outputs 14
Low-Impedance Passive Pads 14
Calibration Trimmers 15
AC Power-Entry Module 15
Fuse Holder 15
Rack Mounting 16
Rack Mount Coupler 16
Blank Rack Panel 16
Benchmark Technologies 17
HPA2™ Headphone Amplifier 17
UltraLock™ Clock System 18
Advanced USB 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 39
Specifications 40
Audio Performance 40
Group Delay (Latency) 41
Digital Audio Inputs 42
Balanced Analog Outputs 43
Unbalanced Analog Outputs 43
HPA2
TM
Headphone Outputs 44
Status Display 44
AC Power Requirements 44
Dimensions 45
Weight 45
Regulatory Compliance 46
FCC Notice (U.S. Only) 46
RoHS Compliant Information 46
CE Certificate of Compliance 47
Warranty Information 48
Benchmark 1 Year Warranty 48
Benchmark Extended Warranty 49
Internal Settings 50
Removing Top Cover 50
Jumpers 50
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