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PCM2707C

Audio Measurements

Bit-perfect ASIO drivers to solve issues with Windows audio quality

by nihtila
written by nihtila
  • By default, Windows audio quality can be technically inferior as has been shown in this measurement.
  • ASIO drivers or similar can improve audio output significantly by bypassing Windows resampling and other not-so-well implemented audio processing stages.

This post arose as a consequence of testing the USB-input of H-DAC. Its PCM2707C-circuit is capable of “only” 48 kHz / 16-bit audio so I was not expecting superb measurement results but was still amazed how bad they actually were. This is purely a technical inspection but the differences are significant so I can easily imagine some golden ears can spot the difference.

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H-DACObsolete

H-DAC – High performance 192 kHz / 24-bit DAC with addon options

by nihtila
written by nihtila
  • Very high performance; measurement results with coaxial S/PDIF input:
    • Output level: 2.0 Vrms
    • Dynamic range / SNR: 122 dB (A-weighted)
    • THD+N ratio: -103 dB (0 dBFS/1 kHz signal, 48 kHz sample rate)
    • Crosstalk: -128 dB at 1 kHz, -112 dB at 10 kHz
  • Supports S/PDIF, Toslink, USB, and external I2S inputs
  • Unbalanced outputs (RCA) on board, balanced (XLR) addon available
  • Hardware-controlled – no need for microcontroller (but one can be added with addon)
  • Can be powered by AC or DC supply
  • Addon available to transform H-DAC into preamplifier/headphone amp
  • New output stage addons can be easily designed to experiment with components and circuits
  • CS8416 S/PDIF-receiver, PCM1794A DAC, LM4562 opamps (or any SO-8 dual opamp), PCM2707C USB-audio, LM2940/LM2990, TPS73633, TPS79133, and REG103 regulators

H-DAC is a high-performance 192 kHz / 24-bit capable DAC board with TI PCM1794A DAC. The board has two coaxial S/PDIF, two Toslink, and one I2S input that can be either on-board 48 kHz / 16-bit USB receiver or an external I2S-device. Input selection and settings are controlled with jumper links that can be replaced by mechanical switches or microcontroller addon board.

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