USB to Ethernet adapter = better sound than ethernet?

General discussion about RuneAudio. Do not post any support or feature requests here.

USB to Ethernet adapter = better sound than ethernet?

Postby tboooe » 11 May 2016, 17:04

I may be totally nuts but I think I perfer the sound when I use a usb to ethernet converter to receive music versus the built-in ethernet port. What got me thinking about trying the usb port instead was this post, though a few years old it talks about the ethernet port being quite noisy:

http://www.crazy-audio.com/2013/10/tracking-down-noise-sources-on-a-raspberry-pi/

I had a Cable Matters usb3.0 to ethernet adapter laying around so I decided to try it. Initial impression is that music is smoother. I need to compare more.

FYI, I use my Pi3 and Rune as a renderer on my network. I also use a HifiBerry Digi+ board outputting via coaxial to my Mutec 3+ reclocker.
tboooe
 
Posts: 30
Joined: 29 Apr 2016, 23:29

Re: USB to Ethernet adapter = better sound than ethernet?

Postby tboooe » 12 May 2016, 00:39

Here is an explanation by someone far smarter than me that maybe shows why I prefer music through the pi3 usb via the usb to ethernet adapter versus from the ethernet port directly:

The big, big, big issue with noise and Ethernet on the Pi is that the Ethernet transformer center taps are tied to the Raspberry Pi 3.3V plane. It has a ferrite, but that is to keep out noise in the MHz range and up, not in the audio range. In fact, the purpose of the center tap is to shunt common mode noise to the power plane!
tboooe
 
Posts: 30
Joined: 29 Apr 2016, 23:29

Re: USB to Ethernet adapter = better sound than ethernet?

Postby PeteB » 12 May 2016, 01:20

I have never looked at the layout closely enough, but if true, this might cause some issues. Not everyone would be able to duplicate the same thing, because if you had a short ethernet cable to a hub or a router on the same circuit ground, then it might not matter. If one the other hand, your ethernet cable leads someplace with noisy grounds, or is more than a few feet long, you could (not necessarily would but could) see/hear a lot more noise.

However, a DAC with its own power supply regulator would be mostly isolated from the problem.
PeteB
 
Posts: 421
Joined: 06 Feb 2016, 05:07

Re: USB to Ethernet adapter = better sound than ethernet?

Postby joselee07 » 24 Apr 2018, 08:25

Yes, If you use a USB ethernet adapter for better sound that's an excellent option for better sound quality. I know Cable Matters is a well-reputed brand for USB ethernet cable. You can also see other options here.
joselee07
 
Posts: 1
Joined: 24 Apr 2018, 08:00

Re: USB to Ethernet adapter = better sound than ethernet?

Postby janui » 26 Sep 2018, 11:16

Hi tboooe, PeteB, joselee07 & JenniferT,
Here are some measurements of the USB 'noise' on a Pi 3B: http://archimago.blogspot.com/2017/01/m ... s-usb.html
And here are some measurements of the Ethernet ‘noise’ on a Pi 3B: http://archimago.blogspot.com/2016/11/m ... ernet.html
janui
User avatar
janui
 
Posts: 682
Joined: 20 Dec 2014, 12:55
Location: Ollanda

support RuneAudio Donate with PayPal


Return to General discussion

Who is online

Users browsing this forum: No registered users and 1 guest