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RE: REVIEW: Metrum Acoustics Octave DAC Processors

It's good to read that you are finally enjoying your CDs. Many of us had feared that the CD era would leave decades of forever lost musical performances behind it. Relatively recent DAC products are starting to erase those fears, even for audiophiles shopping at sane price points.

Regarding sigma-delta versus fully multi-bit conversion technology, I suggest not being too quick in assigning the sound of your Metrum DAC to that difference. There are many factors which determine the sound of a DAC. There are any number of musically well regarded DACs utilizing sigma-delta conversion, such as from dCs, not to mention DSD is a sigma-delta based technology.

FYI - The DIY DAC design community strongly suspects that the DAC chip which Metrum probably utilizes in the Octave is the DAC8581 from T.I. This chip is a generally available DAC chip that's targeted at waveform synthesis applications, but not specifically at consumer digital audio. The DAC8581 features a voltage output, so, doesn't require an external I/V converter circuit.
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Ken Newton


Edits: 03/23/14 03/23/14
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