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User Manual for Benchmark DAC2-HGC Digital to Analog Converter Click to enlarge the picture
Contents of the user manual for the Benchmark DAC2-HGC Digital to Analog Converter
- Product category: AD/DA Converters Benchmark
- Brand: Benchmark
- Description and content of package
- Technical information and basic settings
- Frequently asked questions – FAQ
- Troubleshooting (does not switch on, does not respond, error message, what do I do if...)
- Authorized service for Benchmark AD/DA Converters
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User manual for the Benchmark DAC2-HGC Digital to Analog Converter contain basic instructions
that need to be followed during installation and operation.
Before starting your appliance, the user manual should be read through carefully.
Follow all the safety instructions and warnings, and be guided by the given recommendations.
User manual is an integral part of any Benchmark product,
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for possible defects should you make a warranty claim. Download an official Benchmark user manual in which you will find instructions on how to install, use, maintain and service your product.
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Product description The black Benchmark DAC2-HGC Digital to Analog Converter is a two-channel preamplifier with built-in headphone amplifier and digital to analog converter system. It is capable of conversions of Direct Stream Digital (DSD) signals as well as Pulse Code Modulation (PCM) files up to 24-bit/192 kHz. Designed as an output device for computer-based media, the DAC2-HGC can be used with home media servers, digital audio workstations, desktop audio editing applications, and computer-based radio broadcast systems. The DAC2-HGC boasts a number of features not found in its predecessor, the DAC1, including native DSD conversion, asynchronous USB 2.0, 32-bit internal processing, and increased I/O options.
The DAC2-HGC follows sample-rate changes initiated by your computer or software and uses a multi-mode asynchronous USB system for data transfer. This allows the unit to act as the clock master, reducing jitter by first transferring the audio data from your computer to an internal buffer then to the digital to analog subsystem. The dual data transfer uses Benchmark's proprietary UltraLock2 jitter attenuation system reducing jitter noise and distortion to at least 140dB below the level of the audio.
The 32-bit internal Digital Signal Processing (DSP) is used in tandem with the DAC2-HGC's active analog gain control and passive low-impedance attenuators for the unit's Hybrid Gain Control, or HGC. The HGC provides you with the dynamic range of an analog system and the accuracy of digital control. All analog inputs are controlled in the analog system and digital inputs in the digital system. The 32-bit DSP also provides up to 3.5dBFS of digital headroom.
The DAC2-HGC features a variety of input and output options. It includes two stereo unbalanced analog RCA inputs, two optical TOSlink digital inputs, two coaxial digital inputs, one USB digital input, two stereo analog unbalanced RCA outputs, and one stereo analog balanced XLR output. - All digital inputs on the DAC2 HGC support native DSD, or Direct Stream Digital file conversion
- Four balanced 32-bit DAC audio converters are summed together to form each balanced output channel. This four to one summing reduces noise by up to 6 dB
- 2x HPA2 headphone outputs with option to automatically mute main outputs
- HPA2 gain jumpers allow for customizing headphone output gain for headphone sensitivities
- Low-Impedance Passive Output Pads at 0, 10, and 20dB provide optimized output levels for compatibility with a variety of power amplifiers
- Programmable Home Theater Bypass function sets the pass-through gain to unity for integration of a home theater audio system via the RCA inputs
- The second coaxial input can be reconfigured as a digital output; in output mode, any selected digital input, including USB, will pass through to the coaxial output
- The sample-rate and word-length displays on the DAC2 HGC confirm the proper operation of your media player
- USB system supports USB Audio 2.0, DSD, and USB Audio 1 and will follow sample rate changes initiated by the computer and/or the media playback software
- The 12-volt trigger connection on the DAC2 HGC can be used as an input, output, or both, and is compatible with any common 12-volt trigger input or output. The trigger can be used to turn a power amplifier on or off automatically or respond to a 12-volt trigger and follow the actions of another audio component
- The power switch can place the DAC2 HGC in standby, or full shut down. In full shut down, the unit will still respond to the trigger input and the IR remote control
- Mute and Dim speaker functions available via the front plate or included remote control
- The DAC2 HGC uses distributed power supply regulation. Each critical subsystem has at least one dedicated low-noise voltage regulator
- New in this model:
- Sample-rate display
- Word-length display
- More digital inputs (5 total)
- More analog inputs (2 total)
- More analog outputs (3 total)
- Digital pass through
- Native DSD conversion
- Polarity Switch
- Asynchronous USB 2.0
- Driverless asynchronous USB 1.1
- Home Theater Bypass
- Bi-Directional 12 volt trigger
- Power switch
- Low power consumption
In the Box Benchmark DAC2-HGC Digital to Analog Converter (Black) Power Cable USB Cable Remote Control Limited 5-Year Warranty with Benchmark Online Registration Table of Contents
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Technical parametersBenchmark DAC2 HGC Specs | | | Signal to Noise Ratio | A-Weighted, 0 dBFS = 20 to 29 dBu:
126 dB
Unweighted, 0 dBFS = 20 to 29 dBu:
123 dB | | Total Harmonic Distortion/Noise | 1 kHz @ 0 dBFS:
-109 dBFS, -109 dB, 0.00035%
1 kHz at -1 dBFS:
-110 dBFS, -109 dB, 0.00035%
1 kHz at -3 dBFS:
-113 dBFS, -109 dB, 0.00035%
20 Hz to 20 kHz test tone at -3 dBFS:
-112 dBFS, -108 dB, 0.00040%
Fs = 44.1 to 96 kHz, 20 to 20 kHz BW, 1 kHz test tone, 0 dBFS = +24 dBu | | Frequency Response | @ Fs= 96 kHz:
0 dB, -0.04 dB (20 to 20 kHz)
-0.04 dB at 10 Hz
-0.04 dB at 20 kHz
-0.04 dB at 40 kHz
-0.7 dB at 45 kHz
@ Fs= 48 kHz:
0 dB, -0.04 dB (20 to 20 kHz)
-0.04 dB at 10 Hz
-0.04 dB at 20 kHz
Fs = 44.1 to 96 kHz, 20 to 20 kHz BW, 1 kHz test tone, 0 dBFS = +24 dBu | | Crosstalk | -116 dB at 20 kHz
-130 dB at 1 kHz
-137 dB at 20 Hz | | Jitter | Maximum Amplitude of Jitter Induced Sidebands (10 kHz 0 dBFS test tone, 12.75 UI sinusoidal jitter at 1 kHz):
< -144 dB
Fs = 44.1 to 96 kHz, 20 to 20 kHz BW, 1 kHz test tone, 0 dBFS = +24 dBu | | Max Amplitude | Spurious tones with 0 dBFS test signal: < -138 dB
Idle tones: < -147 dB
AC line related hum & noise: < -140 dB
Fs = 44.1 to 96 kHz, 20 to 20 kHz BW, 1 kHz test tone, 0 dBFS = +24 dBu | | Differential Phase | Inter-channel:
Stereo pair at any sample rate: +/- 0.25° @ 20 kHz
Between DAC2 HGC Units Fs < 110 kHz any sample rate:
+/- 0.25° @ 20 kHz
Fs = 44.1 to 96 kHz, 20 to 20 kHz BW, 1 kHz test tone, 0 dBFS = +24 dBu | | Maximum Lock Time | After Fs change: 400 ms
Fs = 44.1 to 96 kHz, 20 to 20 kHz BW, 1 kHz test tone, 0 dBFS = +24 dBu | | Soft Mute | Ramp up/down time: 50 ms | | Mute | Receive error: Yes
Lock error: Yes
Idle channel: No
50/15 us De-Emphasis enable: automatic in consumer mode
De-Emphasis method: Digital IIR
De-Emphasis supported @: Fs = 32, 44.1, 48 kHz | | Latency | Digital input to analog output (function of sample rate):
1.36 ms at 44.1 kHz
1.27 ms at 48 kHz
0.90 ms at 88.2 kHz
0.82 ms at 96 kHz
0.51 ms at 176.4 kHz
0.47 ms at 192 kHz | | | | Inputs | 2x Stereo pair RCA | | Input Impedance | 20 kΩ | | Maximum Input Level | 19 dBu
@ Factory-set calibration levels: 14 dBu | | Capacitors | DC blocking on all analog inputs
Transient and over-voltage protection on analog inputs:
Series R and diode protection
Input capacitance: 10 pF | | Gain Range | Off to 0.5 dB (RCA in to RCA out)
Off to 16.5 dB (RCA in to XLR out)
Off to 10.5 dB (RCA in to headphone)
Factory-Set gain in home theater bypass mode:
0 dB (RCA in to RCA out)
6 dB (RCA in to XLR out) (with 10 dB Pad) | | Outputs | 4x RCA | | Output Impedance | 30 Ω | | Output Clipping Level | 13.5 dBu | | Output Level | @ 0 dBFS:
Off to 7.5 dBu
Factory set home theater bypass output level (at 0 dBFS):
< +/- 0.006 dB | | | | Balanced Output | 2x Gold-Pin Neutrik male XLR | | Output Impedance | 60 Ω (attenuator off)
425 Ω (attenuator = 10 dB)
135 Ω (attenuator = 20 dB) | | Output Clipping Level | 30 dBu
Output level range (@ 0 dBFS) in 'Variable' mode:
Off to 23 dBu (attenuator off)
Off to 13 dBu (attenuator = 10 dB)
Off to 3 dBu (attenuator = 20 dB) | | Output Level and Impedance | Sample Rate (44.1 kHz versus 96 kHz): < +/- 0.006 dB | | | | Digital Inputs | Switchable between:
1x USB 1.1 or 2.0
2x TOSlink optical
2x Coaxial | | Channels | 2 | | Frequency Range | Coaxial: 28 Hz to 210 kHz
TOSlink optical: 28 Hz to 96 kHz
USB: 44.1, 48, 88.2, 96, 176.4, 192 kHz | | Word Length | Maximum: 24-bits | | Input Impedance | Coaxial input: 75 ͅ | | Capacitors | DC blocking on digital inputs
Transient and over-voltage protection | | Minimum Input Level | Coaxial: 250 mVpp | | Jitter | Tolerance with no measurable change in performance:
>12.75 UI sine, 100 Hz to 3 kHz
>1.5 UI sine at 20 kHz
>1.5 UI sine at 40 kHz
>1.5 UI sine at 80 kHz
>1.5 UI sine at 90 kHz
>0.25 UI sine above 160 kHz
Attenuation method:
Benchmark UltraLock2 on all inputs | | | | Outputs | 2x 1/4" TRS | | Output Impedance | < 0.11 Ω | | Output Level Control | Stereo control on front panel | | Output Level Control | @ 0 dBFS into 60 Ω:
Off to 17 dBu | | Maximum Output Current | 250 mA | | Overload Protection | Current limited: 300 mA, thermal (independent per channel) | | Bandwidth | > 500 kHz | | Total Harmonic Distortion/Noise | -106 dB, 0.0005% into 30 Ω @ 18 dBu (1.26 W) | | | | Indicators | 16x LED on front panel | | Selection Indication | 1x Dim/mute
7x Input
1x Home Theater Bypass
1x Polarity
2x Word-length
4x Sample Rate | | | | Compatibility | Mac OSX
Windows XP, Vista, 7
USB port | | Operating Voltage | Nominal Input Range (VAC RMS):
100 to 240 V
Frequency:
50 to 60 Hz | | Power | < 0.5 W Idle
12 W typical program
15 W maximum | | Fuses | 5x 20 mm (2 required)
0.5 A 250 V Slo-Blo Type | | Operating Range | Minimum/maximum (VAC RMS):
90 to 260 Hz
47 to 63 Hz | | Rack Size | Width: 1/2 rack space
Height: 1 RU | | Dimensions (DxWxH) | 9.3 x 9.5 x 1.7" (237 x 249 x 45 mm) | | Weight | 3 lb (1 kg) | | | | Package Weight | 5.1 lb | | Box Dimensions (LxWxH) | 14.7 x 11.1 x 3.5" |
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