[this_is_vv]

Common setup:

DAC :Tubedac-11
XO : DCX 2496
Amp :Ncore 6 channel
Speaker :DIY Raal,scanspeak and AE 15.


So, i got a logitech squeezebox touch with a channel audio upgraded power supply and i have another custom PC with Linux MPD connected to same dac as usb and Logitech by coaxial.

The difference is huge.

Volume: i can hear much cleared and better with less volume on coaxial then usb. For same level i need to increase the volume of DAC if connected to MPD.

Highs   : They are crisp . I can poinpoint where it start and end.

mids: Found same at both

Lows: Bass is well defined with Logitech vs Linux MPD.

not much fo word guy but thought i share my experience with forum

V

[barrows]

I suspect the differences which you hearing are the differences between the USB and SPDIF inputs of your DAC.  Do you know any details of the implementation of the USB input?

[lcrim]

Have you implemented EDO on the Squeezebox Touch?  The Enhanced Digital Output software upgrade in combination w/ an asynchronous USB DAC which are fairly common and inexpensive will provide a huge upgrade over current sound quality.
I expect the bulk of your library is ripped RB but this upgrade could begin to get you into hi-res material.
Larry