Benchmark ADC1 USB Stereo 24-bit 192kHz A/D Audio Converter (Black)

 

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  • 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 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™ clock system and an extraordinary analog front-end.

    Features:

    • Two channels of analog-to-digital conversion
    • Two XLR balanced analog inputs providing high-performance over a 44 dB range
    • -15 dBu to +29 dBu input sensitivity range (at 0 dBFS)
    • First-stage gain switches (1 per channel): 0 dB, 10 dB and 20 dB
    • 41-detent variable gain controls (1 per channel) with a 24 dB gain range
    • 10-turn gain calibration controls (1 per channel) with a 24 dB gain range
    • 9-segment dual-range digital LED meters
    • Sample rate LED indicators for ‘Main' and ‘Aux' digital outputs
    • Sample rate for USB output is determined by computer (D.A.W./software)
    • Conversion at 44.1, 48, 88.2, 96, 176.4, and 192 kHz
    • USB output resolution 24 bits at 44.1, 48, 88.2, or 96 kHz
    • Versatile external and internal clock modes
    • Multifunction clock input with auto-recognition of AES, SPDIF, Word Clock, or Super Clock
    • Word Clock output
    • Total jitter immunity with Benchmark's, phase-accurate UltraLock™ technology
    • Simultaneous output of up to three different sample rates
    • Simultaneous dithered 16 and 24-bit outputs
    • Five digital outputs (1 XLR, 2 Coax, 1 Optical, 1 USB)
    • AES/EBU, ADAT, and ADAT S/MUX2, and ADAT S/MUX4 output formats
    • THD+N = -104 dB, 0.00063% @ -3 dBFS input, SNR 121 dB A-weighted
    • Reliable and consistent performance under all operating conditions
    • Internal 115 V, 230 V, 50-60 Hz international power supply with very wide operating range
    • Low radiation toroidal power transformer significantly reduces hum and line interference
    • Meets FCC Class B and CE emissions requirement
  • Analog Audio Inputs

    Number of Inputs (balanced 2
    Connector Gold-Pin Neutrik™ female XLR
    Impedance 200 k Ohm
    Sensitivity -14dBu to +29 dBu (at 0 dBFS)

     

    Clock Reference Input

    Format Auto-detect AES/EBU, Word Clock, and Super Clock (256x)
    Impedance 75 Ohms
    Sensitivity 150 mV AES 
    200 mV Word Clock 
    750 mV Super Clock
    Transformer Coupled Yes
    DC Blocking Capacitors Yes
    Transient and Over-Voltage Protection Yes
    Jitter Attenuation Method Benchmark UltraLock

     

    Wordclock Reference Output

    Impedance 75 Ohms
    Level 5 Vpp
    2.5 Vpp into 75 Ohms
    Transformer Coupled No
    DC Blocking Capacitors No
    Transient and Over-Voltage Protection Yes

     

    Digital Audio Outputs

    Number of Digital Outputs 1 XLR Main 
    1 TOSLINK Main 
    1 BNC Main 
    1 BNC Aux 
    1 USB
    Connectors Gold-Pin Neutrik™ male XLR
    Number of Audio Channels 2
    Main Output Word Length 24 bits
    Main Output Sample Frequencies 44.1, 48, 88.2, 176.4, or 192 kHz
    Aux Output Word Length 16 or 24 bits
    Impedance 110 O XLR 
    75 O BNC
    Level 4 Vpp into 100 O XLR 
    1 Vpp into 75 O BNC
    Transformer Coupled Yes
    DC Blocking Capacitors Yes
    Transient and Over-Voltage Protection Yes

     

    Audio Performance

    Fs = 44.1 to 192 kHz, 20 to 20 kHz BW, 1 kHz test tone, 0 dBFS = +24 dBu (unless noted)

    SNR - A-Weighted, 0 dBFS = +8 to +29 dBu 121 dB
    SNR - Unweighted, 0 dBFS = +8 to +29 dBu 119 dB
    SNR - A-Weighted at max gain, 0 dBFS = -14 dBu 108 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 192 kHz Sample Rate -3 dB, +0 dB, 2 Hz to 92 kHz 
    +/- 0.01 dB, 20 Hz to 20 kHz 
    -0.06 dB at 10 Hz 
    -0.01 dB at 20 Hz 
    -0.00 dB at 20 kHz 
    -0.18 dB at 88 kHz 
    -3 dB at 92 kHz 
    -100 dB at 108 kHz
    Frequency Response at 96 kHz Sample Rate -3 dB, +0 dB, 1 Hz to 46 kHz 
    +/- 0.01 dB, 20 Hz to 20 kHz 
    -0.06 dB at 10 Hz -0.01 dB at 20 Hz 
    -0.00 dB at 20 kHz -0.10 dB at 44 kHz 
    -3 dB at 46 kHz -108 dB at 54 kHz
    Frequency Response at 48 kHz Sample Rate 3 dB, +0 dB, 1 Hz to 23 kHz 
    +/- 0.01 dB, 20 Hz to 20 kHz 
    -0.06 dB at 10 Hz 
    -0.01 dB at 20 Hz 
    -0.00 dB at 20 kHz 
    -0.10 dB at 22 kHz 
    -3 dB at 23 kHz 
    -110 dB at 27 kHz
    Passband Ripple +/- 0.008 dB
    Crosstalk -105 dB at 20 kHz 
    -130 dB at 1 kHz 
    -130 dB at 1 kHz 
    -200 dB at 20 Hz
    Jitter Tolerance 
    (With no Measurable Change in Performance)
    >12.75 UI sine, 100 Hz to 10 kHz 
    >3.5 UI sine at 20 kHz 
    >1.2 UI sine at 40 kHz 
    >0.4 UI sine at 80 kHz 
    >0.29 UI sine at 90 kHz 
    >0.25 UI sine above 160 kHz
    Maximum Amplitude of Jitter Induced Sidebands < -134 dB with 
    10 kHz 0 dBFS test tone 
    12.75 UI sinusoidal jitter at 1 kHz
    (measurement limit)
    Maximum Amplitude of Spurious Tones with 0 dBFS test signal -130 dBFS
    Maximum Amplitude of Idle Tones -145 dBFS
    Maximum Amplitude of AC line related Hum & Noise -130 dBFS
    Interchannel Differential Phase 
    (Stereo Pair)
    +/- 0.5 degrees at 20 kHz
    Interchannel Differential Phase 
    (Between ADC1 Units)
    +/- 0.5 degrees at 20 kHz
    Maximum Lock Time after Fs change < 1 s for frequency lock 
    < 5 s for phase lock
    Mute on Sample Rate Change Yes
    Mute on Loss of External Clock No
    Mute on Lock Error No
    Mute on Receive Error No
    Soft Mute Ramp Up/Down Time 10 ms

     

    Group Delay (Latency)

    Delay (Analog Input to Digital Output) 1.20 ms at 44.1 kHz 
    1.09 ms at 48 kHz 
    0.75 ms at 88.2 kHz 
    0.67 ms at 96 kHz 
    0.63 ms at 176.4 kHz 
    0.59 ms at 192 kHz

     

    LED Status Indicators

    LED Location Front Panel
    Mode Indicators 9 green
    Meter 14 green, 2 yellow, 2 red

     

    AC Power Requirements

    14 green, 2 yellow, 2 red 110 V setting - 95 V min 140 V max 
    220 V setting - 190 V min, 285 V max
    Frequency 50-60 Hz
    Power 16 Watts Idle 
    16 Watts Typical Program 
    20 Watts Maximum
    Fuses 5 x 20 mm (2 required) 
    110 V setting - 0.5 A 250 V Slo-Blo® Type 
    220 V setting - 0.5 A 250 V Slo-Blo® Type

     

    Dimensions

    Form Factor 1/2 Rack Wide, 1 RU High
    Depth behind front panel 8.5" (216 mm)
    Overall depth including connectors 
    without power cord or BNC-to-RCA adapter
    9.33" (237 mm)
    Width 9.5" (249 mm)
    Height 1.725" (44.5 mm)

     

    Weight

    ADC1 only 3.6 lb.
    ADC1 with power cord, 3 BNC-to-RCA adapters, extra fuses, and manual 4.9 lb.
    Rack mount kit (blank panel, junction block, and rack-mount screws) 0.32 lb.
    Shipping weight 7 lb.
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