Do I need an expensive digital cable?

@audio-b-dog 

I think SACD uses DSD, butr also a higher sampling rate, so it's not apples to apples comparing a PCM CD to a DSD SACD

It is certainly not apples to apples.  DSD is designed to be a far better delivery format.  SACD uses DSD at 64 times the sampling rate of CD, often written DSD64.

Sony and Philips created SACD as the successor to CD. It is only in North America that the format failed to take off.

SACDs have a much higher density layer that can hold several SACD versions. 

Nearly all SACDs have a 5.1 channel version, and a 2 channel version.

Note that most SACDs have a standard Redbook CD layer that can be read by any CD player.  These are called hybrid SACDs.

If you really want to compare formats, I'd recommend some recent releases from the Norwegian label 2l.no.  They include a hybrid SACD with multiple versions and a CD layer, plus a Pure Audio Blu-ray disk with multiple high resolution PCM formats and even Dolby Atmos, all in the same box.  Grammy winning stuff.

In Oz, we have an advert running for the never never land (Northern Territory) with the line "if you never ever go, you'll never ever know".

@audio-b-dog 

ChatGPT’s diagram of how DSD works is very misleading.  Even worse than Qobuz’s explanation of high-resolution!

For example, where the ChatGPT waveform is flat, there should be an equal number of alternating 0 and 1 bits, the exact opposite of what the diagram shows.

It is very simple.  Keep a running total of where the sound pressure is up to. Take a sample.  If it is higher than your running total, add a 1 bit to the stream and your running total.  If it is lower, add a 0 bit to the stream and reduce your running total by 1.

By the way, every 64 samples, your running total equals the CD 16-bit number at that point.  You can exactly calculate the CD data from the DSD stream, but the reverse does not apply.

@richardbrand 

Could you give me some real world examples of what you're talking about? My Moon 280D streamer handles both DSD and PCM. I also have both Tidal and Qobuz loaded. So, you could probably give me any piece of music to listen to and compare what is happening. Several times I have listened to the same album on Hi Rez Qobuz and Tidal. I'm trying to choose between the two. So far, I think I'm favoring Qobuz. My choice will only be partly on the sound. I also listen to a lot of classical music and jazz, and there seems to be more to choose from on Qobuz. But I am also interrested in sound differences. 

All of this takes time, of course, and concentration, both of which are in short supply. But I intend on comparing my CD player against streaming, now that I have a somewhat decent (passable?) digital coax cable. My initial impression is that CD often sounds better, but I know this does not make logical sense. 

This is all very interesting, folks.

To complicate matters further, most SACD transports do not export native DSD to a DAC due to imbecilic copyright protections that exclusively inconvenience honest users. In practice, SACD transports only output  DSD natively to DACs of the same brand through a secure proprietary interface, essentially making the transport + DAC the equivalent of a SACD player.

Otherwise, sadly, your SACD transport downconverts your DSD signal to PCM before sending it to your DAC. Manufacturers seldom brag about this, or any up / downsampling or format conversions done in the digital domain for that matter. What audiophiles don’t know can’t hurt them.

The idea is to make it too difficult for non-expert users to capture (and, presumably, pilfer) the DSD stream.

Now, Accuphase’s acclaimed duet of DP-1000 transport ($24,975) and DC-1000 DAC ($24,975) plays SACD end-to-end. No shenanigans there; you get exactly what you thought you were getting.

Accuphase makes amazing gear, but it is not inexpensive. A more down-to-earth alternative is PRC-made gear. DRM? What’s DRM? HAHAHA THOSE SILLY AMERICANS!!!

That’s how it goes with 2-channel audio. DSD over HDMI is a different ball of wax.

@audio-b-dog 

I can't help you choose between streaming services!

But for classical, I highly recommend Presto Classical's streaming service, because they really understand the structure of classical pieces, and their recommendations come with multiple reviews and downloadable booklets.

There are far too many variables in streaming (see earlier post), so it is no surprise to me that CD often sounds better.

If you want to compare DSD and PCM, silver disks are the go.  For less than the price of a cable, buy this Album: DIVERTIMENTI (2L-050-SABD) or this Reflections - Works by Britten, Stravinsky & Vaughan Williams 2L 2L125SABD [DBi] Classical Music Reviews: March 2017 - MusicWeb-International

You get 9 different deliveries of the same recording!