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Weighting measurements by human perception has been an integral part of audio electronics and acoustic for a very long time! For instance, in the '50s and '60s, the BBC (UK) and the DIN Institute (Germany) separately assessed the subjective intrusiveness of noise. The results of both works had...

Very interesting add-on ! Thanks to you for having made this measurements and to AnalogSteph for his insight and test files. Readers may be interested to know that the great Italian Hi-Fi magazine Audioreview, which have published impressive measurements and studies, used to published the...

By your observation, are perceptual codings such as DTS or Dolby Digital also affected?

It is very well known that the CD layers of the 20-some SA-CD reissues of Mercury Living Presence historical three tracks recordings are of different origin than the SA-CD layers. The CD layers are taken from the first CD releases supervised by Wilma Cozart Fine herself in the early nineties...

As far as the RCA Living Stereo reissued on SA-CD are concerned, Stereophile has published information procured by Mr John Newton, the supervisor of the remastering project: "The CD layer on the hybrid discs is produced with a sophisticated computer program that downconverts the stereo DSD...

This thread is a great reminder that, as is proverbial, there is no such thing as a free lunch. Hard work deserves to be paid for. Hence the importance of paying for the goods and services that we obtain, whether material or intangible like... music!

Oh yes! May discs or other musical contents editors read you...

Yes, multichannel has become the poor relation of musical home reproduction. The Hi-Fi industry is at a standstill if not going backward... Especially compared to recording practices, primarily in classical music production, where multichannel is generally considered the most significant...

May I suggest that your point is irrelevant: the low-pass reconstruction filter (what you name the further treatment of the analogue signal) is necessary not because of the digital nature of the input signal, but because the input signal is also a sampled signal. An analogue low-pass...

No, it was not this amp Mr Putzeys referred to, because the Pass Labs is not a class D amp.

Must have been Bruno Putzeys, who, in this very interesting lecture, concluded "Keep in mind that no converter designer in their right mind would ever consider building a DAC using power FETs" (from 35'54''):

Thank you for this review. Datasheet of the STA350BW chip is available from ST Microelectronics : https://www.st.com/resource/en/datasheet/sta350b.pdf Specifications of the output stage is in page 18 and performance curve from page 23 (voodooless has extracted two graphs from it). ST...

I update the files this September 18th, 2024, with 10 new devices and 1 more test of an already tested device (see first post). Tests in 16 bits : Berendsen CDP-1 (2nd sample) Exposure XXII Lua Cantilena II Musical Fidelity X-Ray V3 Naim CD 5i (not to be confused with CD 5i already tested)...

I think the shape of the HF noise in this graph below just indicates that DSD is decimated in PCM at (at most) 96 kHz sample rate, which means that the DSD stream is low pass filtered in the digital domain to eliminate frequencies (hence noise) above something about 40 kHz to avoid aliasing...

Well, what's left is to dream about a crowdfunded project of editing an hybrid AudioScienceReview SA-CD test-disc collaborately created with the help of Multitone software to create the DSD test signals of interest and the same soft, or other means, to create equivalent PCM test signals for the...

To my knowledge, the accuracy of any DAC is determined by considering every DAC chip as a black box and by measuring the performance at its output. To determine the accuracy of a delta-sigma DAC in a digital scale in bits is no different than for any other types of DAC : measure the parameter of...

Well written contribution to the debate, jdg78. May I ad that the professional organisations of the recording industry of Europe, Asia and America were in search of a new format based on the then new Digital Versatile Disc (DVD) to supersede to the CD. They regrouped under the umbrella of an...

Hurrah! Thank you! I wonder if there is a difference of quality between the stereo and multichannel tracks of this disc.

By the way, as I speak of GXAlan's analysis : if you look closely his graph illustrating the 1 kHz@-16 dB tone of the Denon disc in the digital domain, you will find that most of the spray of harmonics and other spuriae visible on your FFT are actually on the disc! Only the third and perhaps...

As I see that the third harmonic of the 15 kHz tone is about -70 dB under the fundamental, within the dynamic range and measurement bandwidth of my old Hewlett Packard 3581A wave analyser, I just searched this harmonic out of curiosity at the output of two of my SA-CD players playing the same...