for streaming why not computer/galvanic isolation/DAC clock?


Hello and thanks for your help. I have been trying to figure out how to best stream to my set up and looked at many alternatives, all the conflicting posts  etc etc. I just wonder why one cannot use a computer with a device for good  galvanic isolation, and rely on the clock within the DAC to eliminate issues of jitter. If one is worried about SQ only (not the features of the software) what is wrong with this simple set up?  I bought a mac mini with extra memory (had dropouts until I upped the memory) and use an Innuos device for galvanic isolation. The Innuos has no external power supply and is built to use the power from the input USB, so no power in at that point (suppose a different device with linear power supply might make an improvement). I run a 3 foot long USB to the Innuous to keep noise away from my stuff. All power cords and interconnects are shielded and show nothing when I use a sniffer, even the one for the computer (you can get one of those from a company focused on people worried about EMI and health). I have Roon on the mini, and use the mini as the Roon server. When I use WiFi rather than an ethernet connection there are no dropouts;  I assume that is better than bringing in noise from ethernte. Thanks for your help - a mac mini is not cheap, but costs far less than high end streamers. Do people pay for the file management etc, or is the SQ better with a dedicated streamer? (My setup: RME ADI2 or Qutest DAC, ARC LS25 II pre, McIntosh 462 power amp).

arhgef

Given your system, I would recommend you borrow a purpose built streamer. It may not answer why a streamer sounds better, but it will resolve any doubts that it does and by a good margin.

There are two issues you should think about when using a PC/laptop as a source.  Galvanic isolation for the signal which I assume is USB, and the noise in the power supply.

You can solve the power supply noise issue by putting the PC on a different AC circuit, but then that causes digital ground loops and sometimes even audible hum via ground loops.  If it's digital only it can cause excess jitter

Some DACs have excellent galvanic isolation on the USB port, some do not.  Either way the solutions are cheap.

The big issue IMHO tends to be the power supply noise, which is of course is also the ground loop issue.

So, yes, get an inexpensive USB isolator but also be aware of where you plug the PC power into.  If at all possible put it on a different circuit, and under no circumstances should you put it on the "clean" side of your power conditioners.

Forgot to mention that I have the power amp on one dedicated circuit, the DAC and pre on another. Computer is plugged into a regular wall outlet. Using a Panamax power conditioner on the outlet with the DAC and Pre. No ground loops that I can hear. 

Amazingly when I plug anything into the “high current” outlet on the Panamax I get all sorts of noise coming out of the components, revealed by the sniffer. Even if I put in a simple floor lamp with no bulb in the socket, the noise appears, with lamp turned off. Completely silent when I use only the low current outlets. The components that become noisy are plugged into those low current outlets.