However, the DSD file has ‘real’ content up to around 34 kHz. 16/44.1 file up-sampled to 352.8 using XXHighEnd’s Arc Prediction filter.16/44.1 file up-sampled to 352.8 using Roon’s smooth-mp filter.16/44.1 file up-sampled to 352.8 using HQPlayer’s poly-sinc-lp filter (& TPDF dither).16/44.1 file up-sampled to 352.8 using HQPlayer’s sinc-M filter (& NS5 noise-shaping).original RR 24/176.4 file played back bit-perfectly (to provide a reference file for listening comparisons).
I took five 24/176.4 captures of the analogue output of my DAC: I could have kept things purely in the digital domain, but decided to capture the analogue output of my DAC instead, as ultimately, it’s here that ‘the rubber meets the road’. So, I decimated the RR 24/176.4 file down to 16/44.1 (with TPDF dither). It would have passed through a passive analogue anti-alias filter (no over-sampling) and digitized using full ladder converters (no sigma-delta modulation).īut I wanted to use a 16/44.1 file for the comparison, as 99.9% of my music is in this format. It would have been recorded judiciously by Keith Johnson, originally in analogue and mastered for digital on a Pacific Microsonics Model Two, a machine I know very well. I started out with a Reference Recordings 24/176.4 file, the main reasons being SQ and provenance.
Music server -ethernet-> audio PC -USB-> DAC -analogue-> ADC -USB-> laptop
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