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We decided to set the highest bar with OL DAC, by far outperforming ODAC and eclipsing the sea of alternatives beyond just benchmarks. OL DAC's external AC power supply ensures 100% consistent noise performance and its relay muting eliminates power-up transients; while the minimalist USB Edition relies on the same external AC powered design minus relay muting and optical input.


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The Objective Line began as an opensource amp design by blogger NwAvGuy. Through years of customer feedback, we've engineered several amps and DACs along the same technical philosophy and design spirit. OL DAC is fundamentally the best value brought to the series, and can stack with Objective2 and/or OL Switcher to form a versatile listening center.


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Low Noise

Optical and USB Inputs

OL DAC provides the basics. Its USB Audio Class 1 engine is plug-and-play with all operating systems, and optional optical input expands connectivity to home entertainment. Mode is easily selected by a front mounted slider switch.

Low Jitter

Differential Summing Output

Differential output of the AK4490EQ DAC is summed by a low noise amplifier, with DC coupling throughout. Directly drive any load!

Output Impedance

Externally Powered

OL DAC is powered by the same circuitry developed for our flagship EL DAC, using an AC power adapter and 9 linear regulators to ensure consistent rail voltage and super low ripple (no USB power). Never be bothered by USB hubs or OS power management configuration again!

Tech Specs

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DAC Performance

  • Frequency Response 10Hz-20kHz (96k) +/- 0.15dB
  • THD+N 20Hz-20kHz < 0.001%
  • IMD CCIF 19/20 kHz -6.03 dBFS 0.00033%
  • IMD SMPTE -6.03 dBFS 0.00031%
  • Noise (A-Weighted) -109 dBu
  • Dynamic Range (A-Weighted) 114 dB
  • Linearity Error -90 dBFS +/-0.01 dB
  • Crosstalk -10 dBFS 100K RCA -108 dB
  • USB Jitter Components 11025Hz -116 dB
  • PCB Stackup 4 Layers
  • Maximum DAC Line-Output, 100K 2.00 VRMS

Data Support

  • Audio Formats (Optical) 16/44.1kHz thru 24/192kHz**
  • Audio Formats (USB) 16/44.1kHz thru 24/96kHz
  • USB Interface USB Audio Class 1
  • USB Driver OS Support Windows XP/7/8/10, PS4, OS X, iOS, Linux


  • Digital Inputs USB and TOSLINK*
  • DAC Line-Output RCA
  • *Optical input is an optional feature.
    **Many optical sources are unable to reliably transmit at 192kHz.


  • Case Dimensions 4.27 x 3.15 x 1.16 in
  • Weight 13 oz


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  • OL DAC v1.10
  • 15VAC Power Adapter
  • 3ft USB Type-A Cable


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