Benchmark DAC2 D Digital Reference DAC (Silver)

Benchmark DAC2 D Digital Reference DAC (Silver)

Benchmark DAC2 D Digital Reference DAC (Silver)

B&H # BEDAC2DS MFR # 500-15100-100
Benchmark DAC2 D Digital Reference DAC (Silver)

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Product Highlights

  • Sample Rate and Word Length Display
  • 5 Digital Inputs, 3 Analog Inputs
  • Native DSD Conversion
  • Polarity Switch and Home Theater Bypass
  • Asynchronous USB 2.0, Driverless USB 1.1
  • Power Switch and Low Power Consumption
  • Hybrid Gain Control
  • UltraLock2 Jitter Attenuation System
  • Quad 32-bit balanced D/A Conversion
  • High-Headroom DSP
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  • 1Description

The silver version of the DAC2 D Reference Stereo Preamplifier from Benchmark features low noise, low distortion, improved accuracy, outstanding musical detail, precise stereo imaging, an advanced digital filter design, and a high sample-rate asynchronous USB audio interface. All inputs are fully isolated from interface jitter by the UltraLock2 jitter attenuation system. Internal digital processing and conversion is 32-bits, and includes 3.5 dB of headroom above 0 dBFS. Four balanced 32-bit D/A converters are summed together for each balanced output.

Hybrid Gain Control
Utilizes a servo-driven volume control and passive output attenuators with a 32-bit DSP system to raise and reduce distortion-free gain
Native DSD Conversion
Supports native DSD conversion and automatically detects DoP 1.0, the DSD standard over PCM
UltraLock2 Jitter Attenuation System
Uses 32-bit DSP processing with 3.5 dB headroom and 211 kHz sample rate to reduce jitter to 140 dB below the level of the music
Excess Digital Headroom
Handles digital signals as high as +3.5 dBFS to accommodate inter-samples from the converter's interpolation process
Multi-Mode Asynchronous USB System
Utilizes two-stage jitter-reducing asynchronous conversion through USB 1.1 up to 96 kHz, USB 2.0 up to 192 kHz, and DSD
Quad 32-bit Balanced Conversion System
Utilizes four balanced redundant 32-bit D/A converters to reduce noise and distortion
Diagnostic Tools - Sample-Rate and Word-Length Indicators
Analyzes your computer's media player to ensure proper sampling rate and bit depth
Polarity Switch
Inverts the polarity of the signal when necessary
Home Theater Bypass
Sets the pass-through gain to unity when using a surround system for home theater
Digital Pass Through
Reconfigures the second coaxial input as a digital pass through with support for DSD using DoP 1.0, Dolby Digital, and DTS formats sent to a surround sound processor
Power Switch
The DAC can be put in standby mode or shut down completely. Each subsystem in the power supply is regulated by a dedicated low-noise voltage regulator and on average the system consumes 12 W of power
Low Power Consumption
The DAC2 D uses high-efficiency, low noise power supplies and can be operated from any standard international voltage without adjustment. Power consumption is 12W typical.
Distributed Power Regulation
Utilizes dedicated low-noise voltage regulators to achieve the lowest possible noise
HPA2 Headphone Amplifier
Drives headphones loads from 30 Ω to 600 Ω without any increase in distortion and full protection against damage from short circuits.
Differential Amplifiers
Removes common-mode distortion components from the D/A converter outputs to achieve low-distortion in down-stream devices
In the Box
Benchmark DAC2 D Digital Reference DAC (Silver)
  • Power Cord
  • Limited 1-Year Warranty
  • Table of Contents
    • 1Description
    Audio Performance
    Sampling Frequency 44.1 to 96 kHz, 20 to 20 kHz BW, 1 kHz test tone, 0 dBFS = +24 dBu (unless noted)
    SNR A-Weighted, 0 dBFS = +20 to +29 dBu: 126 dB
    Unweighted, 0 dBFS = +20 to +29 dBu: 123 dB
    THD + N 1 kHz at 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 to 20 kHz test tone at -3 dBFS: -112 dBFS, -108 dB, 0.00040%
    Frequency Response Fs=96 kHz:
    +0 dB, -0.04 dB (20 Hz 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
    Crosstalk -116 dB at 20 kHz
    -130 dB at 1 kHz
    -137 dB at 20 Hz
    Amplitude Jitter Induced Sidebands (10 kHz 0 dBFS test tone, 12.75 UI sinusoidal jitter at 1 kHz): < -144 dB
    Spurious Tones with 0 dBFS test signal: < -138 dB
    Idle Tones: < -147 dB
    AC line related Hum & Noise: < -140 dB
    Differential Phase Inter-channel (Stereo Pair - any sample rate): +/- 0.25˚ at 20 kHz
    Time Lock Period after Fs change: 400 ms (maximum)
    Soft Mute Ramp Up/Down: 50 ms
    De-Emphasis 50/15 us Enable: Automatic in Consumer Mode
    Method: Digital IIR
    Supported At: Fs = 32, 44.1, 48 kHz
    Latency Delay - 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
    Digital Audio Inputs
    Digital Inputs Switch Selected: 5 (1 USB, 2 Optical, 2 Coaxial)
    Number of Channels 2
    Sampling Frequency Input range:
    28 to 210 kHz (Coaxial)
    28 to 96 kHz (Optical)
    44.1, 48, 88.2, 96, 176.4, 192 kHz (USB)
    Word Length Input: 24 bits (maximum)
    Input Impedance Coaxial input (jumper selected): 75 Ω
    Input Level Minimum: 250 mVp-p on Coaxial
    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 (all inputs)
    Digital Audio Output
    Digital Output 1x coaxial (input reconfigured as output)
    Analog Audio Outputs
    Type Balanced
    Number of Outputs 2
    Output Connector Gold-Pin Neutrik male XLR
    Output Impedance 60 Ω (Attenuator off)
    425 Ω (Attenuator = 10 dB)
    135 Ω (Attenuator = 20 dB)
    Clip Point: +30 dBu
    Bypass Factory Set Home Theater Level (at 0 dBFS): +13 dBu (Attenuator = 10 dB)
    Output Level Range (at 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)

    Variation with Sample Rate (44.1 kHz vs. 96 kHz):
    < +/- 0.006 dB
    Type Unbalanced
    Number of Outputs 4
    Output Connector RCA
    Output Impedance 30 Ω
    Clip Point: +13.5 dBu
    Bypass Factory Set Home Theater Output Level (at 0 dBFS): +7.5 dBu (1.77 Vrms)
    Output Level Range (at 0 dBFS): Off to +7.5 dBu
    Variation with Sample Rate (44.1 kHz vs. 96 kHz): < +/- 0.006 dB
    Headphone Output
    Number of Outputs 2
    Output Connectors 1-4" TRS with switch on left-hand jack
    Output Impedance < 0.11 Ω
    Output Level Control Stereo Control on Front Panel
    Output Level Adjustment Range @ 0 dBFS into 60 Ω Load: Off to +17 dBu
    Maximum Output Current 250 mA
    Overload Protection Independent Per Channel: Current limited at 300 mA, Thermal
    Bandwidth > 500 kHz
    THD + N -106 dB, 0.0005% into 30 Ω at +18 dBu (1.26 W)
    Status Display
    Indicators Type and Location: 16 LED's on Front Panel
    Selection Indication 1: Dim/Mute
    7: Input
    1: Home Theater Bypass/High Throughput Mode
    1: Polarity
    2: Word length
    4: Sample Rate
    Power Requirements
    Operating Range Nominal Input: 100 to 240 V, 50 to 60 Hz
    Minimum/Maximum: 90 to 260 V, 47 to 63 Hz
    Power < 0.5 W Idle
    12 W Typical Program
    15 W Maximum
    Fuses 5 x 20 mm (2 required)
    0.5 A, 250 V Slo-Blo Type
    Form Factor 0.5 Rack Wide, 1 RU High
    Depth Behind Front Panel: 8.5" (215.9 mm)
    Overall (including connectors but without power cord): 9.3" (236.2 mm)
    Width 9.5" (241.3 mm)
    Height 1.7" (43.1 mm)
    Weight 3.0 lb (1.3 kg)

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