pjabarnett@hotmail.co.uk said:
As far as I know, there are three wired ways to stream music from my PC to my hifi (DAC); ethernet via my router, USB, or bitstream (coaxial/TOSLINK). Taking into account how a PC handles the music file in the first place, does anyone know if any of the three ways of transferring the file to a DAC has any sound quality advantages over the others? Anyone done any blind comparisons? I have quite a few 24 bit 192 khz Apple Lossless files in my iTunes library, and I want to make the best use of them. I am aware that most USB DACs that fall within my very limited purchasing price range can only handle up to 24 bit 96 khz files, but I would be willing to sacrifice bitrate if anyone knows a USB link to be superior. Your thoughts and findings would be much appreciated.
Which streming device are you thinking of using? The now defunct Squeezbox would be able to do the full 24/192, though how much support is available for it im unsure of.
Regarding the connections/protocols:
Ethernet has solid data transfer up to 80 feet and has the highest bandwidth with 100 gigabits per second.
USB has solid data transfer up to 16 feet, it has a low bandwidth compared to ethernet with 480 megabits per second. Also the USB bus is likely to be shared among several users. Even if you are plugged into different ports you are probably sharing the same controler as all of the other devices on the bus, so your device is sharing the USB bus bandwidth with all of the other devices.
I do recal an Apple Mac Mini that audio folk use as it has a dedicted USB port, the port is individually controlled that has its own power rail which keeps noise down compared to a shared bus.
Coaxial is for short runs only with grounding.
Toslink has the lowest bandwidth but offers ground isolatuin between products and noise immunity over long runs.