Computer to DAC Streamer

Can anyone point me to measurements of electrical noise on various USB ports captured by a high precision (16 bit) oscilloscope?
I would love to see if there is any noise on the data lines (+/-) as well as ground and +5VBUS from a "noisy PC" compared to the same measurements on dedicated hardware streamers like Auralic, ultraRendu, etc.

I doubt these measurements exist because it would be tricky to probe these signals; one would need a 500MHz (or faster) high precision active differential probe connected to nearest VIA's or attached as direct to the connector pinout as possible. You would need an active session with an enumerated device on the bus receiving active packets.  Perhaps one does not need to measure the data lines, but just the +5V and GND signals;

I have not heard any difference between my 2018 Xenon Lenovo, Sonore ultraRendu with Linear supply, home built windows 10 pro, or my totally killer BOXX work machine when streaming directly to my Exogal Comet plus DAC. I plug my headphones directly into the Exogal and it always sounds amazing; No change in noise floor, no static, no loss of resolution, just beautiful music; These PC's all run Roon Core, Tidal, or Qobuz native apps, and more recently Audirvana.

I am not a cable skeptic, nor power conditioner. I have heard REAL and changes with my stuff all plugged into an Isotek Aquarius EVO3 (I heard NO improvement when stuff connected into Furman).
I have heard differences in speaker cables and power cords as well; 

There is much marketing talk about "noisy desktop PC's" but I have not come across anyone publishing USB noise comparison measurements. 

So, I guess I am skeptical that there is any actual electrical difference in terms of broadband noise on any of the nets mentioned above (D+/D-, +5V, GND); 



 

@mgrif104 I had to do a little research on the Aurender N100H and the feedback you provided was what I was looking for.

There are so many factors when considering getting the bits to your DAC.
- location of hard drive
- type of hard drive
- wired vs wireless
- Ethernet or USB out from source
- Type of input into a DAC
- use an internal DAC in a streamer
- cables
- ROON | JRiver | others
- quality of audio system playing the tunes

I can find a link somewhere online from reviewers, manufacturers, and users that argue for various combination of these things with so much divergence in opinion.

Good thing is that almost all combinations of the approaches today sound better than in the days of my old Squeezebox (2004ish).

This old dog is starting to think that maybe I need to learn a new trick and give a dedicated audio server a shot.

@dpac996 Your observations mirror mine regarding a noisy or busy computer streaming to a Rendu. I do not hear any difference when I have a lot of programs running on my computer. I have very good hearing (one of a few things I am good at).

However, the issue is whether a dedicated audio server is better than the noisy computer - Rendu approach. Quite a few posters are saying there is an audible difference with a dedicated server.

The marketdoes not lie. Nobody would be purchasing 
these devices if they didnt produce audibily superior results

While I am a huge fan and student of markets, i completely disagree.  The fact that people *want* something proves nothing about its superior properties, or audibility thereof.  People buy homeopathy, ICOs, pyramid schemes, horoscopes, large cap equity managers, Tice clocks, etc.  That does not demonstrate their superiority, only a preference, which may involve wishful thinking, status-seeking, a need for company, or bad probabilistic thinking.  There's even a lively debate in economics about the value of most college educations and whether they constitute signaling more than qualification.  Things are not what they seem.