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User Manual for Benchmark DAC2 L Digital to Analog Audio Converter Click to enlarge the picture
Contents of the user manual for the Benchmark DAC2 L Digital to Analog
- Product category: Monitoring Accessories 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 Monitoring Accessories
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User manual for the Benchmark DAC2 L Digital to Analog 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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Following the instructions for use is an essential prerequisite for protecting
health and property during use, as well as recognition of liability on the part of the manufacturer
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.
And do not forget – unsuitable use of a Benchmark product will considerably shorten its lifespan!
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Product description The black DAC2 L Digital to Analog Audio Converter from Benchmark is a low noise, low distortion 2-channel digital to analog converter. This DAC2 converter features two unbalanced RCA stereo pair inputs, two digital audio channel inputs, and two analog balanced outputs. The DAC2 L system supports multi-mode asynchronous USB system. It employs an advanced high-headroom digital filter design and a high sample rate asynchronous USB audio interface with each input fully isolated from interface jitter using the company's UltraLock2 jitter attenuation system. The device performs 32-bit internal processing and conversion and includes 3.5 dB of headroom above 0 dBFS. Each Balanced output is the sum of four balanced 32-bit converters. All digital inputs on the converter support native DSD conversion. The DoP1.1 open standard is automatically detected by the device on all inputs and the system seamlessly switches to native DSD conversion. The DAC is designed to directly drive power amplifiers and powered speakers. The XLR outputs of the converters feature adjustable low-impedance passive attenuators that can be used to optimize the matching of the converter to the power amplifier or powered speaker. Sonically, the converter has been designed for maximum transparency making it appropriate for professional reference and Hi-Fi critical listening applications alike. The converter combines active analog gain control with passive low-impedance attenuators, a 32-bit digital gain control, and a servo-driven volume control. Each of the inputs can be controlled by the rotary volume control which also will move in response a remote control (sold separately). None of the digital inputs are ever allowed to pass through an analog potentiometer, and are instead controlled by the unit's 32-bit DSP system for precise L/R balance and imaging with minimal distortion or noise. The passive output attenuators provide gain reduction without compromising the dynamic range of the converter. The device's Ultralock Jitter attenuation system uses 32-bit DSP processing with 3.5 dB of headroom and a sample rate of 211 kHz to reduce jitter to at least 140 dB below the level of the music and well below the threshold of human hearing to eliminate audible jitter artifacts. The DSP can handle digital signals as high as +3.5 dBFS because the inter-sample peaks found in many commercial releases as the result of signal interpolation can sometimes exceed the 0 dBFs threshold of individual sinusoidal wave samples. The device's USB system supports USB Audio 2.0, DSD, and USB Audio 1.1. The frequency agile design allows the converter to follow sample rate changes initiated by the computer or media playback software while retaining asynchronous conversion to eliminate unnecessary sources of jitter. The master clock of the device has a low-jitter design which controls the transfer of audio from the computer to the USB sub-system, then to a buffer in the DAC, and then to the D/A conversion sub-system. This second asynchronous transfer eliminates any traces of jitter that may accumulate as the data is transferred between the USB and conversion subsystems. The synchronous USB system supports USB Audio 2.0 for high resolution 192 kHz and DSD playback. No drivers are required on Mac operating systems and an easy to install driver adds both 192 kHz and DSD capabilities to Windows operating systems. An Asynchronous driverless USB Audio 1.1 mode can be enabled from the front panel or from the remote control (sold separately) to allow quick plug and play connections to Windows, Mac, iOS, and Linux operating systems. Even when the DAC is powered down, the USB subsystem will remain active to prevent interruption of computer operations and eliminate the need to reconfigure the computer every time the device is turned on. - Quad 32-bit Balanced Conversion System
- Uses four balanced 32-bit D/A converters to deliver 4:1 redundancy which reduces noise and distortion
- Diagnostic Tools - Sample-Rate and Word-Length Indicators
- Displays sample-rate and word-length to confirm the proper operation of your media player
- Polarity Switch
- Inverts the polarity of the signal to solve phase related problems
- Home Theater Bypass
- Sets the pass-through gain to unity when the surround system is active
- Digital Pass Through
- Allows any selected digital input (including USB) to pass through to the coaxial output in bit transparent formats including DSD (DOP 1.0), Dolby Digital, and DTS
- Power Switch
- Sets the convert to standby or shut down mode with power consumption less than 0.5 W in full shut down
- Low Power Consumption
- Uses high-efficiency low noise power supplies that may be operated from any standard international voltage without adjustment
- Distributed Power Regulation
- Uses distributed power supply regulation of each critical subsystem with at least one dedicated low-noise voltage regulator
In the Box Benchmark DAC2 L Digital to Analog Audio Converter (Black) Power Cord Extra Fuses Limited 1-Year Warranty Table of Contents
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Technical parametersBenchmark 500-15200-400 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 | | 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 OS X 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 | 5.0 lb | Box Dimensions (LxWxH) | 14.6 x 11.1 x 3.3" |
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