Is a USB stick directly into ones streamer (renderer) better than streaming from a PC/NAS?

@akg_ca - I agree this can force one 'down the rabbit hole', but that is the reason for my original post, to get people to go down it, and explain their reasoning. Also, your idea that there's no 'noise' before the DAC, is wrong. We're not talking of musical noise here, but noise genereated by the device itself, the switch eg.

The link you've supplied from the network engineer, is, basically, irrelevant, as he's talking of data transmission and it's integrity along the way, which is not the issue here. He also doesn't seem to understand the issue we're talking about. He says that it's ridiculous to suggest that this can colour the audio signals - THAT statement proves he's not on the same page as most on here, as no-one is talking of audio signals being coloured in a switch or ethernaet cable. nIt's the JITTER that's produced which is the issue, I believe.

Do you realise that your post has several duplications within it?

I agree with what cindyment is saying, I'm afraid akg, although we're not talking of analogue electronics here. Everything in this post is iin the digital domaine

Whether the digital Data is sourced from USB or ethernet the clock for the DAC is the couple from the data source. There is no evidence that the incoming data connection causes jitter on the output. That would be very very difficult to occur on ethernet and while theoretically possible due to electrical noise on USB there is little evidence that actually happens. For USB isolators are relatively inexpensive. The noise generated internally in the DAC is going to exceed external noise generally by a significant amount. The edge speeds in modern logic are quick meaning that small amounts of noise generate insignificant amounts of jitter.

@cindyment - It's not jitter on the output of the DAC I'm wondering about, it's on the input, along with electrical noise, which is/may be created by the ethernet links - switch/cables/PS.

USB 'isolators', not inexpensive IMO, as they vary, in rip off terms, from £50 to £250, and have been proven, with in depth measurments, to do absolutely nothing to anything passing through them. Legalised stealing is my opinion of them, as are 'special' mains input fuses.

There's been a lot of discussion in this thread, but little in a way of answering why people spend so so much on the equipment mentioned, when a cheap USB stick plugged into your device gives as good, or better SQ.

Forget your NAS (for music), forget your PC (for music), expensive Audiophle PC or not, forget your expensive switch and associated expensive LPS's to power each of those things, and not forgetting to forget your expensive ethernet cable. You can dispense with ALL that noise/jitter creating expensive hardware and just spend c£10 on a USB stick - job done. There, I've just saved you (and me) £1000>£10,000. No-one has said anything to convice me, or suggest otherwise.

I believe this thread is finished now.

Thanks for all your contributions and opinions.