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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
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
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.
Removes common-mode distortion components from the D/A converter outputs to achieve low-distortion in down-stream devices
44.1 to 96 kHz, 20 to 20 kHz BW, 1 kHz test tone, 0 dBFS = +24 dBu (unless noted)
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%
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
-116 dB at 20 kHz -130 dB at 1 kHz -137 dB at 20 Hz
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
Inter-channel (Stereo Pair - any sample rate): +/- 0.25˚ at 20 kHz
Lock Period after Fs change: 400 ms (maximum) Soft Mute Ramp Up/Down: 50 ms
50/15 us Enable: Automatic in Consumer Mode Method: Digital IIR Supported At: Fs = 32, 44.1, 48 kHz
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
Input range: 28 to 210 kHz (Coaxial) 28 to 96 kHz (Optical) 44.1, 48, 88.2, 96, 176.4, 192 kHz (USB)
Input: 24 bits (maximum)
Coaxial input (jumper selected): 75 Ω
Minimum: 250 mVp-p on Coaxial
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