Mastering Converters & Interfaces

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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 exceed 
expectations. The Benchmark ADC1 USB
 continues a tradition of excellence. 
 
The ADC1 USB 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™(tm) clock 
system and an extraordinary analog front-end. 
 
Jitter-immune UltraLock™ 
The UltraLock™(tm) system delivers consistent, high-quality conversion 
even when slaved to a poor quality external clock. The performance of 
the ADC1 USB 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™(tm) 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 USB 
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. Capture 
exact imaging, difficult transients, and subtle details with stunning 
realism. 
 
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 USB has a total of 5 digital outputs (1-XLR, 2-coax, 1-optical,
 and 1-USB). 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. 
 
Benchmark's AdvancedUSB 
Benchmark's AdvancedUSB solution provides a bit-transparent computer 
interface that is capable of streaming at rates up to 96 kHz/24-bit 
without installing any drivers. This reduces CPU loading, eliminates 
driver compatibility issues, and greatly improves the reliability of the
 data transfer. Benchmark's unique driver-less AdvancedUSB(tm) solution 
is compatible with Mac OSX and Windows 2000, XP, and Vista. Benchmark's 
UltraLock™(tm) clock system insures the audio will never be contaminated
 with jitter-induced artifacts from a poor-quality computer-based clock.
 With the Benchmark ADC1, the performance of the USB interface matches 
the quality of the AES and ADAT interfaces. The convenience of a direct 
computer interface no longer comes with a performance penalty! 
 
Consistent Performance 
Often specifications only indicate how a product will perform under the 
most optimal conditions. The ADC1 USB is designed to deliver consistent 
performance - even in adverse conditions. The ADC1 USB 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'. A full list of specifications and performance charts can be 
found in the ADC1 USB manual (available on our website).

Benchmark ADC1 USB Black Rackmount
2-Channel 24-bit 192kHz A/D Converter with Advanced USB Audio technology