Award winning Black PS Audio DirectStream DAC:

    Clean trade in Current Model DAC S/N 070978 Includes Bridge V-1. 

Can connect to a NAS through Ethernet to play you library of music or can be used as a stand alone DAC or as a Digital based pre amplifier (no pre amplifier needed)....

Here are some of the advantages PS Audio cites for DSD playback:

• 
  DSD is simple to convert to analog: just run it through a low-pass filter. It doesn’t need a brick-wall filter like PCM, which can affect the sound. The DirectStream DAC uses a 24dB-per-octave low-pass filter, the same as you’ll find in many loudspeaker crossover networks. [In theory, a DSD bitstream can be converted to analog with a single capacitor.—RH]
  


• DSD is inherently linear; it’s hard to build a PCM DAC that always takes the same-sized step in the output for any possible unit increment of the representative PCM voltage value.


• DSD soft clips when overdriven, more like magnetic tape.


• All bits in a DSD stream have the same weight; a single-bit error anywhere is barely measurable, let alone audible.

PS Audio describes the DirectStream DAC’s circuit as follows:

All incoming data, PCM and DSD, are upsampled to 30 bits running at ten times the standard DSD rate and then back down again to double DSD for noise-shaping. The ten-times DSD sampling rate was the lowest common rate attainable through integer upsampling of 176.4 and 192kHz PCM files. An internal volume control maintains complete precision. Except for the sigma-delta modulation process itself there is no rounding; a full 50 bits are used. Consequently, there is no degradation from using the digital volume control. After the volume control, the signal is converted to DSD and downsampled to double-speed DSD (often referred to as DSD128). The double-speed DSD rate allows the low-pass filter to begin rolling off at 80kHz. A higher output rate would would have increased jitter.

There is no conventional analog output stage. The output of the DSD engine is fed directly into high-speed, high-voltage, high-current symmetrical video amplifiers and from there into the passive output filter. Rather than use an active output section, a balanced wideband transformer (which is part of the low-pass filter) drives either balanced or unbalanced interconnect cables. The output impedance is 100 ohms (unbalanced)/200 ohms (balanced), which should drive any reasonable load.

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     David Weinhart

Weinhart Design, Inc. 
   President & CEO 

The Audio and Video Expert

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  Los Angeles, California 90077

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