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    Benchmark ADC1 - Analog to Digital Audio Converter - Discontinued


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    The ADC1 (non USB version) has been discontinued. It has been replaced by the ADC1 USB. This newer version adds a USB Audio output.

    The ADC1

    The barrier between analog and digital should not limit the listening experience. Benchmark's digital converter technology maintains the sense of musical engagement that was originally present when the sounds were created. The life of the music is never lost in a quagmire of digital artifacts. The depth is never hidden, the image is never smeared. Benchmark converters always deliver faithfully and consistently. The ADC1 continues Benchmark's tradition of excellence.

    "The Benchmark Media ADC1's superior down-conversion design made possible in part by the latest chip technology, the unique UltraLock™ low-jitter clock, optimized analog input circuitry and the four multiformat digital outputs makes it a worthy studio tool that will sound great for years to come. I highly recommend it as a way to instantly upgrade the recording quality of any studio."

    - Barry Rudolph, Mix

    The ADC1 is a 2-channel 192-kHz 24-bit analog-to-digital audio converter with an unprecedented feature set. This converter was designed to consistently deliver reference quality conversion in 'real-world' conditions. It features Benchmark's jitter-immune UltraLock™ clock system and an extraordinary analog front-end.


    This Benchmark product was designed, assembled, and tested in the USA using USA and imported components. Most major components are made in USA.

    Jitter-immune UltraLock™

    The UltraLock™ system delivers consistent, high-quality conversion even when slaved to a poor quality external clock. The performance of the ADC1 will not degrade when slaved to an external clock - a claim very few converters can make. Enjoy the convenience of a clock input that automatically recognizes AES/EBU, S/PDIF, Word Clock, or Super Clock sources - all with the unsurpassed jitter immunity of Benchmark's UltraLock™ clock-isolation system.

    Benchmark's Precision Analog Circuitry

    Benchmark has a long tradition of building ultra-high performance analog circuits that are designed for maximum transparency. The ADC1 extends this tradition by pushing performance to the limits of today's technology. The analog front-end delivers low-noise low-distortion high-bandwidth performance over a wide gain range (45dB). Precise gain and calibration controls allow for accurate channel matching. The ADC1 captures precise imaging, subtle details, and difficult transients - all with stunning realism.

    "The Benchmark ADC1’s sonic qualities are stunning; the converter has the ability to realistically reproduce all the fine inner detail and presence subtitles that only the best high-resolution converters can. Impressive. Put a set of these in your ProTools rig." (PDF)

    - John Gatski, Pro Audio Review

    Intelligent Meters

    The nine-segment dual-range, digital LED meters enable high-precision level monitoring. Meter response times are matched to the response of the human eye so that every peak is clearly visible. All metering is fully-digital and is not subject to calibration errors. A peak hold function allows an infinite hold to verify that an over has not occurred. Dual ranges allow signal presence monitoring, or precise headroom indication. The meters even use an upsampling technique to detect and display inter-sample peak overloads. This upsampled metering warns of potential overloads that may not be detected by conventional digital meters.

    Flexible Digital Outputs

    The ADC1 has a total of 4 digital outputs (1-XLR, 2-coax and 1-optical). These can operate simultaneously at up to three independent sample rates. One of the coaxial outputs can be configured for 16-bit TPDF dithered output. This unique flexibility allows simultaneous recording to a CDR, while recording high-resolution to a digital recorder and a DAW. For example the CDR may operate at 44.1/16 while the DAW operates at 88.2/24 while the digital recorder operates at 192/24. Backup and/or reference recordings can be created with ease while high-resolution outputs are fed to primary recording devices. The optical output supports AES or ADAT formats at resolutions up to 192/24. In ADAT mode, high sample rates are supported using SMUX2 and SMUX4.

    Consistent Performance

    Often specifications only indicate how a product will perform under the most optimal conditions. The ADC1 is designed to deliver consistent performance - even in adverse conditions. The ADC1 is fully specified at all gain settings, all sample rates, through all digital outputs, and even when locked to a high-jitter clock signal. This performance insures reliable and predictable results in the 'real world'.

    "Benchmark's versatile and full-featured ADC1 USB both measures superbly well and produces digital files that sound equally superb."

    - John Atkinson, Stereophile


    SNR – A-Weighted, 0 dBFS = +16 to +29 dBu

    121 dB

    SNR – Unweighted, 0 dBFS = +16 to +29 dBu

    119 dB

    SNR – A-Weighted at max gain, 0 dBFS = -10 dBv

    117 dB

    THD+N, 1 kHz at –1 dBFS

    -102 dBFS, -101 dB, 0.00089%

    THD+N, 1 kHz at –3 dBFS

    -107 dBFS, -104 dB, 0.00063%

    THD+N, 20 to 20 kHz test tone at –3 dBFS

    -106 dBFS, -103 dB, 0.00071%

    Frequency Response at Fs=192 kHz

    -3 dB, +0 dB, 2 Hz to 94 kHz

    +/- 0.01 dB, 20 Hz to 20 kHz


    Detailed specifications and performance plots are available in the downloadable manual.


    ADC1 Manual


    ADC1 Reviews

    Add Benchmark Cables to Complete You New System

    Benchmark offers a no-nonsense selection of very high-quality cables. Benchmark cables are designed for durability and transparency, and most are manufactured in the USA. Our optical cables are manufactured in Canada.

    Add a Rack-Mount Coupler

    The ADC1 is housed in a 1/2-wide 1 RU chassis. Two units can be mounted side-by-side using a Benchmark Rack-Mount Coupler.

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