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Non-oversampling DAC measurements

Discussion in 'Currawong' started by currawong, Feb 20, 2017.
  1. Currawong Contributor
    Back in 2012, I bought a Metrum Octave and I thought I'd see for myself how a non-oversampling DAC performs.  These are only sine waves at various frequencies through the Reference 7 and Metrum, They are quite interesting. Note that the scale is not always exactly the same.
     
    Ref71kHz.png
    Reference 7, 1 kHz 44.1/16 (Distortion is probably noise in the scope)
     
    MetrumOctave1Khz.png
    Metrum Octave, 1 kHz 44.1/16
     
     
    Ref75kHz.png
    Reference 7, 5 khz 44.1/16
     
    MetrumOctave5kHz.png
    Metrum Octave, 5 kHz 44.1/16
     
    Ref710kHz.png
    Reference 7, 10 kHz 44.1/16
     
    MetrumOctave10kHz.png
    Metrum Octave, 10 kHz 44.1/16
     
    MetrumOctave10Khz24-96.png
    Metrum Octave, 10 kHz 24/96 (High-res effects the same thing as using 2x oversampling - the aliasing has mostly gone.)
     
    Ref715kHz.png
    Reference 7, 15 kHz 44.1/16
     
    MetrumOctave15kHz.png
    Metrum Octave, 15 kHz 44.1/16 (Ouch!)
     
    MetrumOctave15Khz24-96.png
    Metrum Octave, 15 kHz 24/96
     
    Ref720kHz.png
    Reference 7, 20 kHz 44.1/16
     
    MetrumOctave20kHz.png
    Metrum Octave, 20 kHz 44.1/16. Wow, but by this point the usual NOS filters will have rolled off the output severely.
     
    MetrumOctave20Khz24-96.png
    Metrum Octave, 20 kHz 24/96.
     

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